JP7266730B2 - Fluid injection device, gas turbine engine, and method for manufacturing fluid injection device - Google Patents

Description

The present invention relates to a fluid injection device, a gas turbine engine including the fluid injection device, and a method of manufacturing the fluid injection device.

In an aircraft engine, the amount of fuel required to burn changes greatly in the series of processes from engine ignition to ground idling to takeoff (maximum thrust output), and the amount of fuel injected (discharged) from the fuel nozzle is small. It can be changed from flow rate to large flow rate.

When trying to cover a range from small flow rate to large flow rate with a single oil passage, when injecting a small flow rate of fuel from the nozzle, the fuel pressure can be low, but a large flow rate of fuel is injected from the nozzle. In some cases, it is necessary to increase the fuel pressure, which places a heavy burden on the fuel pump mounted on the engine. Therefore, nozzles mounted on aircraft engines generally have two independent oil passages. When the flow rate is small, the fuel flows only through the first oil passage. By allowing fuel to flow not only through the oil passage but also through the second oil passage, it is possible to flow a large amount of fuel at low fuel pressure.

Further, generally, "the direction in which fuel flows into the fuel nozzle" and "the direction in which fuel is injected from the fuel nozzle" are different. Therefore, the conventional fuel nozzle having the two oil passages described above has a structure in which each of the two independent oil passages is bent at a steep angle on the way.

For example, U.S. Pat. No. 6,200,000 discloses a fuel nozzle support system for a gas turbine engine.
The fuel nozzle support system includes an elongated stem body, an inlet end having a primary fuel inlet and a secondary fuel inlet, an outlet end having a primary fuel outlet and a secondary fuel outlet; a concentric longitudinal secondary fuel hole providing communication between the secondary fuel inlet and the secondary fuel outlet; a concentric primary fuel tube mounted in a sealed manner and providing communication between the primary fuel inlet and the primary fuel outlet. In this fuel nozzle support system, as shown in FIG. 1 (cross-sectional view) of Patent Document 1, "the first oil passage from the primary fuel inlet to the primary fuel outlet" and "the secondary fuel flow The second oil passage from the inlet to the secondary fuel outlet is bent at a steep angle in the middle.

Japanese translation of PCT publication No. 2003-515718

As described above, the flow path of the conventional fuel injection nozzle is bent at a steep angle, resulting in a relatively large pressure loss. In order to inject a large amount of fuel while suppressing pressure loss, the diameter of the pipe may be increased, but in this case, the size of the fuel injection nozzle itself becomes large. If an attempt is made to increase the pipe diameter without enlarging the size of the fuel injection nozzle itself, the strength of the fuel injection nozzle itself will decrease, making it difficult to ensure the required strength.

A fuel injection nozzle in which a plurality of deep oil passages having a circular cross section are arranged in parallel is also conceivable. However, when providing a small fuel injection nozzle having such an oil passage configuration, it is difficult to increase the cross-sectional area of each oil passage, and the pressure loss of each oil passage is large.

The present invention has been made in view of the above circumstances, and is capable of appropriately injecting a fluid (for example, fuel) from a small flow rate to a large flow rate while efficiently arranging flow paths in a limited space. SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid injection device that can be used, a gas turbine engine including such a fluid injection device, and a method of manufacturing such a fluid injection device. It is another object of the present invention to provide a fluid injection device including flow passages having good strength and low pressure loss, a gas turbine engine including such a fluid injection device, and a method of manufacturing such a fluid injection device. for other purposes.

One aspect of the present invention is a fluid ejecting device including at least two flow paths, wherein each of the at least two flow paths independently extends from a fluid inflow end to a fluid outflow end. The wall surfaces of the are smoothly connected, and are arranged side by side at the end into which the fluid flows, and at the end from which the fluid flows out, one flow path is provided so as to surround at least one other flow path. related to a fluid ejection device.

Each of the at least two flow paths has a bent portion, and one flow path has a cross-sectional diameter larger than that of the upstream side at least at the bent portion and is provided so as to surround at least one other flow path. good too.

The at least two flow paths include a first flow path and a second flow path, the first flow path and the second flow path being closer to the second flow path than the first flow path upstream of the bend. is arranged close to the end from which the fluid flows out, and at the bend, the cross-sectional diameter of the first flow path is larger than that on the upstream side, the first flow path surrounds the second flow path, and the downstream side of the bend is , the first channel may extend to surround the second channel.

The at least two flow paths include a first flow path and a second flow path, wherein the first flow path and the second flow path are more prevalent than the second flow path upstream of the bend. , is arranged close to the end from which the fluid flows out, the cross-sectional diameter of the first flow path is larger than that on the upstream side at the bend, and the first flow path surrounds the second flow path at the bend, and on the downstream side from the bend, The first channel may extend to surround the second channel.

The cross section of the first flow path may have a line-symmetrical shape at least downstream of the bend.

A cross-section of the first channel may have an annular shape at least downstream of the bend.

The at least two flow paths may include linearly extending first and second flow paths.

The wall forming the second flow path may be connected to the wall forming the first flow path arranged outside the wall forming the second flow path via the holding section. .

The wall forming the second channel may be connected to the wall forming the first channel via two or more holding parts.

The two or more holding portions may include a plurality of holding portions having mutually different cross-sectional widths.

The holding portion may include a holding portion having a cross-sectional width that is greater than the cross-sectional width of the second flow path.

Another aspect of the invention relates to a gas turbine engine comprising a fluid injection device as described above, wherein at least two flow paths of the fluid injection device are flowed with fluid fuel.

According to another aspect of the present invention, the step of specifying the three-dimensional shape data of the fluid ejection device, the step of converting the three-dimensional shape data into a plurality of slice data, and the layered manufacturing method based on the plurality of slice data. and molding the fluid ejection device.

The additive manufacturing method may use powders of at least one of Inconel, cobalt chromium, nickel alloys, titanium alloys and stainless steel.

The average particle size of the powder may be 20 micrometers or less.

At least two flow paths included in the fluid ejection device may include flow paths whose cross sections are deformed at least in part.

According to the present invention, since one of the at least two flow paths provided in the fluid ejection device is provided so as to surround at least one other flow path, the flow path can be efficiently arranged in a limited space. A small flow rate to a large flow rate of fluid can be ejected from the fluid ejection device while being positioned. In addition, one of the at least two flow paths provided in the fluid ejection device is provided so as to surround at least one other flow path, thereby ensuring good strength of the fluid ejection device and reducing pressure loss. Small flow paths can be realized. According to the present invention, a gas turbine engine having such a fluid injection device and a method of manufacturing such a fluid injection device can be provided.

FIG. 1 is a longitudinal sectional view of the fluid ejection device according to the first embodiment. FIG. 2 is a perspective view of the fluid ejection device shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line II-II in FIG. 1 is removed. FIG. 3 is a perspective view of the fluid ejection device shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line III-III in FIG. 1 is removed. FIG. 4 is a perspective view of the fluid ejection device shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line IV-IV in FIG. 1 is removed. FIG. 5 is a perspective view of the fluid ejection device shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line VV in FIG. 1 is removed. FIG. 6 is a perspective view of the fluid ejection device shown in FIG. 1, showing a state in which a portion on the tip side of the section line VI-VI in FIG. 1 is removed. FIG. 7 is an enlarged view of the tip portion (fluid outflow portion) of the fluid ejection device viewed from the direction indicated by arrow A in FIG. FIG. 8 is a longitudinal sectional view of a fluid ejection device according to another example (comparative example). FIG. 9 is a vertical cross-sectional view of a fluid ejection device according to the second embodiment. FIG. 10 is a perspective view of the fluid ejection device shown in FIG. 9, showing a state in which a portion on the tip side of the cross-sectional line XX in FIG. 9 is removed. FIG. 11 is a perspective view of the fluid ejection device shown in FIG. 9, showing a state in which a portion on the tip side of the cross-sectional line XI-XI in FIG. 9 is removed. FIG. 12 is a block diagram showing a functional configuration example of a gas turbine engine. FIG. 13 is a flow chart showing an example of a method for manufacturing a fluid ejection device. FIG. 14 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 15 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 16 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 17 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 18 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 19 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 20 is a diagram for explaining the layered manufacturing method, and is a perspective view showing the state of the fluid ejection device in the manufacturing process. FIG. 21 shows an example of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 22 shows an example of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 23 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 24 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) included in the fluid ejection device. FIG. 25 shows an example of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 26 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 27 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 28 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) included in the fluid ejection device. FIG. 29 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 30 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 31 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 32 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 33 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 34 shows examples of cross-sectional shapes of a plurality of flow paths (first flow path and second flow path) provided in the fluid ejection device. FIG. 35 is a vertical cross-sectional view of the fluid ejection device in which the vicinity of the downstream side of the first channel and the second channel is partially extracted, and the connection state of the first channel wall portion and the second channel wall portion. It is a figure for demonstrating an example. FIG. 36 is a vertical cross-sectional view of the fluid ejecting device in which the vicinity of the downstream flow path of the first flow path and the second flow path is partially extracted, and the connection state of the first flow path wall and the second flow path wall It is a figure for demonstrating an example. FIG. 37 is a vertical cross-sectional view of the fluid ejection device in which a part of the vicinity of the downstream side of the first and second flow paths is extracted, showing a connection mode of the first flow path wall portion and the second flow path wall portion. It is a figure for demonstrating an example. FIG. 38 is a diagram of the fluid ejection device (fluid outflow portion) viewed from arrow B in FIG. 37 . FIG. 39 is a vertical cross-sectional view of a fluid ejection device showing a modified example of the fluid ejection device, and shows an example of the fluid ejection device that does not include a bent portion. FIG. 40 is a diagram of the fluid ejection device (fluid outflow portion) viewed from arrow C in FIG. 39 . 41 is a cross-sectional view of the fluid ejection device along section line XLI-XLI in FIG. 39. FIG. 42 is a cross-sectional view of the fluid ejection device along section line XLII-XLII in FIG. 39. FIG. 43 is a cross-sectional view of the fluid ejection device taken along section line XLIII-XLIII in FIG. 39. FIG.

A plurality of embodiments and modifications of the present invention will be described with reference to the drawings. In order to facilitate explanation and understanding, the elements shown in each drawing include elements whose scale and length-to-width ratio are changed or exaggerated from those of the real thing. Sizes and other features do not necessarily match exactly between the drawings.

Each embodiment of the invention described below relates to a fluid ejection device having at least two flow paths. These channels are arranged side by side on the upstream side, while one channel is deformed to surround at least one other channel on the downstream side. As a result, the fluid ejecting apparatus can effectively suppress an increase in size of itself and appropriately eject a fluid from a small flow rate to a large flow rate. Note that "upstream side" and "downstream side" are based on the flow direction of the fluid (fuel), and the fluid flows from the upstream side to the downstream side.

In the following, as an example, a fluid injection device (fuel injection nozzle) that is provided with two mutually independent flow paths and that injects liquid fuel (fluid) will be described. In order to reduce the pressure loss in the fuel oil passage (flow path), each of the two independent oil passages has a sufficient cross-sectional area (flow passage area) according to the maximum flow rate of each, and has a smooth surface. The extension direction is changed to draw a curve. In order to reduce the cross-sectional area of the product itself, the two oil passages are arranged in parallel on the upstream side, but are arranged so as to have a concentric cross-sectional structure on the downstream side. In particular, the wall portion forming the inner oil passage and the wall portion forming the outer oil passage having a concentric cross-sectional structure are connected to each other via ribs (retaining portions), or directly connected to each other and integrally. It is provided in the oil passage to ensure appropriate oil passage strength. In order not to block the flow of fuel, such ribs preferably have a plate-like structure extending in the direction of fuel flow, and the thickness thereof is preferably as thin as possible.

Specific embodiments will be described below.

<First Embodiment>
FIG. 1 is a longitudinal sectional view of a fluid ejection device 10 according to the first embodiment. FIG. 2 is a perspective view of the fluid ejection device 10 shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line II-II in FIG. 1 is removed. FIG. 3 is a perspective view of the fluid ejection device 10 shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line III-III in FIG. 1 is removed. FIG. 4 is a perspective view of the fluid ejection device 10 shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line IV-IV in FIG. 1 is removed. FIG. 5 is a perspective view of the fluid ejection device 10 shown in FIG. 1, showing a state in which a portion on the tip side of the cross-sectional line VV in FIG. 1 is removed. FIG. 6 is a perspective view of the fluid ejection device 10 shown in FIG. 1, showing a state in which a portion on the tip side of the section line VI-VI in FIG. 1 is removed. FIG. 7 is an enlarged view of the tip portion (fluid outflow portion 27) of the fluid ejection device 10 viewed from the direction indicated by arrow A in FIG.

The fluid ejection device 10 of this embodiment includes two flow paths 20 (a first flow path 21 and a second flow path 22). The fluid ejection device 10 is penetrated from the inflow portion 26 to the fluid outflow portion 27 . The fluid inflow portion 26 is an end portion of the fluid injection device 10 into which fuel (fluid) flows. The fluid outflow portion 27 is an end portion of the fluid injection device 10 from which fuel flows out (is injected).

The first flow path 21 and the second flow path 22 are arranged side by side in the fluid inflow section 26, and in the fluid outflow section 27, one flow path (the first flow path 21 in this embodiment) is replaced by the other flow path ( In this embodiment, it is provided so as to surround the second flow path 22). In the illustrated example, the second flow path 22 is arranged substantially in the center (center) of the cross section of the first flow path 21 .

Each of the first channel 21 and the second channel 22 has a bend 25 . Of the first flow path 21 and the second flow path 22, the flow path on the upstream side of the bend 25 is called an upstream flow path 28, and the flow path on the downstream side of the bend 25 is called a downstream flow path 29. call. The upstream channel 28 of each of the first channel 21 and the second channel 22 opens at the fluid inlet 26, and the downstream channel 29 of each of the first channel 21 and the second channel 22 opens the fluid. It opens at portion 27 .

The first flow path 21 (one flow path) has a larger cross-sectional diameter than the upstream flow path 28 at least at the bend 25 (in the present embodiment, at the bend 25 and the downstream flow path 29), Moreover, it is provided so as to surround the second channel 22 (at least one other channel). The cross-sectional diameter of the first flow path 21 here refers to the diameter of the first flow path 21 in the cross section in the direction perpendicular to the flow direction of the fuel flowing through the first flow path 21 (that is, the extension direction of the first flow path 21). diameter. The cross-sectional diameter of the first flow path 21 is the cross-sectional diameter of the area surrounded by the first flow path wall portion 31 forming the first flow path 21, and the ribs 35 described later (in this embodiment, the first ribs 35a, The cross-sectional diameter of the first flow path 21 can be similarly determined when the first flow path 21 is partitioned by the second rib 35b and the third rib 35c).

As described above, in the first flow path 21 and the second flow path 22 of the present embodiment, the second flow path 22 is higher than the first flow path 21 in the upstream flow path 28 on the upstream side of the bent portion 25. , is located close to the end from which the fluid exits (ie, the fluid exit 27). Therefore, regarding the opening positions of the first flow path 21 and the second flow path 22 in the fluid inflow section 26, the opening of the second flow path 22 is closer to the fluid outflow section 27 than the opening of the first flow path 21. placed. Also, in the bent portion 25 , the cross-sectional diameter of the first flow path 21 is larger than that of the upstream flow path 28 on the upstream side, and the first flow path 21 surrounds the second flow path 22 . In the downstream channel 29 on the downstream side of the bent portion 25 , the first channel 21 and the second channel 22 extend so that the first channel 21 surrounds the second channel 22 .

The cross sections of the first flow path 21 and the second flow path 22 are axisymmetric at least downstream of the bent portion 25 (in this embodiment, at all positions from the fluid inflow portion 26 to the fluid outflow portion 27). have a shape. The cross section of the first flow path 21 and the second flow path 22 referred to here is a cross section in a direction perpendicular to the flow direction of the fuel (that is, the extending direction of the flow path). In the illustrated example, the first flow path 21 has a circular cross-section at the upstream flow path 28 and has an axisymmetrical annular (annulus) cross-section from the bent portion 25 to the downstream flow path 29 (Fig. 2 to 6). On the other hand, the second flow path 22 has a circular cross section at all positions from the fluid inflow portion 26 to the fluid outflow portion 27 .

The second flow path wall portion 32 forming the second flow path 22 is arranged outside the second flow path wall portion 32 with respect to the "first flow path wall portion 31 forming the first flow path 21". , are connected via ribs 35 (holding portions). More specifically, two or more ribs 35 (three ribs 35 (first rib 35a, second rib 35b, and third rib 35c) in this embodiment) form the second flow path wall 32 in the first flow path. It is connected to the road wall portion 31 . These two or more ribs 35 (first rib 35a, second rib 35b, and third rib 35c) include a plurality of ribs 35 having mutually different cross-sectional widths. In the example shown in FIGS. 2-3, the second rib 35b and the third rib 35c have substantially the same cross-sectional width, but the first rib 35a has a greater cross-sectional width than the second rib 35b and the third rib 35c. In particular, the first rib 35a of this example has a cross-sectional width that is greater than the cross-sectional width of the second channel 22 . The cross-sectional width referred to here is determined based on the length (for example, the maximum projected length) of the cross-section in the direction perpendicular to the fuel flow direction.

When a plurality of ribs 35 are provided as described above, from the viewpoint of supporting the first flow path wall portion 31 and the second flow path wall portion 32 in a well-balanced manner, the plurality of ribs 35 are provided on the first flow path wall. It is preferable that they are arranged equidistantly and/or symmetrically (for example, linearly symmetrically or rotationally symmetrically) with respect to the circumferential direction of the second channel 22 between the portion 31 and the second channel wall portion 32 . In the examples shown in FIGS. 2 to 7, "the first flow path 21 between the first rib 35a and the second rib 35b", "the first flow path 21 between the second rib 35b and the third rib 35c" ' and 'the first flow path 21 between the first rib 35a and the third rib 35c' have substantially the same cross-sectional shape.

FIG. 8 is a longitudinal sectional view of a fluid ejection device 10a according to another example (comparative example). In the fluid ejection device 10a shown in FIG. 8, the flow paths 20 (the first flow path 21 and the second flow path 22) extend parallel to each other from the fluid inflow portion 26 to the fluid outflow portion 27. exist. In the fluid ejection device 10a of this comparative example, it is not easy to increase the flow area (cross-sectional area) of the first flow path 21 and the second flow path 22 in a limited space. The bend 25 of the two channels 22 curves at a very sharp angle. Therefore, the pressure loss at the bent portion 25 of the first flow path 21 and the second flow path 22 is large, and the energy loss is large. In addition, in the flow path configuration of the fluid ejection device 10a of this comparative example, in order to secure the strength of each flow path 20 (the first flow path 21 and the second flow path 22) and achieve a large flow path area, it is necessary to It is necessary to increase the size of the entire device 10a, and it is difficult to reduce the size of the fluid ejection device 10a.

On the other hand, the fluid ejection device 10 according to the first embodiment has the following structural features as described above.
a. In the fuel inflow portion (fluid inflow portion 26), two independent fuel oil passages (first flow passage 21 and second flow passage 22) are provided in parallel.
b. The two fuel oil passages (first flow passage 21 and second flow passage 22) change their extending directions while drawing a gentle curve, and have a concentric cross-sectional structure at the fuel outflow portion (fluid outflow portion 27). have
c. A rib 35 (a first rib 35a, a second rib 35b, and a third rib 35c) is provided between the first flow path wall portion 31 and the second flow path wall portion 32, and the rib 35 allows each fuel oil path to The strength of (the first channel 21 and the second channel 22) is ensured.

According to the fluid ejection device 10 (see FIGS. 1 to 7) according to the first embodiment having these structural features, since the first flow path 21 is provided so as to surround the second flow path 22, the fluid can be ejected. The channel areas of the first channel 21 and the second channel 22 can be relatively large while suppressing an increase in the overall size of the device 10 . In particular, by making the first flow path 21 surround the second flow path 22 at the bent portion 25, the cross-sectional area (flow path area) of the first flow path 21 and the second flow path 22 having a sufficient size can be increased. It is possible to moderate the degree of bending of the first flow path 21 and the second flow path 22 at the bent portion 25 (that is, to reduce the curvature) while ensuring this. As a result, the fuel can smoothly flow through the bent portions 25 of the first flow path 21 and the second flow path 22 with a small pressure loss. Furthermore, in the present embodiment, the second flow path 22 is arranged closer to the fluid outlet portion 27 than the first flow path 21 on the upstream side of the bent portion 25 . The first channel 21 can be gently curved by making the curvature of the channel 21 relatively small. On the other hand, by arranging the first flow path 21 and the second flow path 22 in parallel in the fluid inflow portion 26, it is possible to easily introduce fuel from the outside into the first flow path 21 and the second flow path 22. It can be carried out. In addition, the ribs (the first rib 35a, the second rib 35b, and the third rib 35c) can ensure the required strength.

As described above, according to the fluid ejection device 10 of the present embodiment, each flow path 20 (the first flow path 21 and the second flow path 22) can be efficiently arranged in a limited space, and the flow rate can be reduced from a small flow rate. It is possible to appropriately inject fuel up to a large flow rate, and to realize a flow path with small pressure loss while ensuring good strength.

The configuration of the fluid ejection device 10 according to the first embodiment is not limited to the examples shown in FIGS. 1 to 7, and various modifications are possible. Specific examples of such modifications will be described later.

<Second embodiment>
FIG. 9 is a longitudinal sectional view of the fluid ejection device 10 according to the second embodiment. FIG. 10 is a perspective view of the fluid ejection device 10 shown in FIG. 9, showing a state in which a portion on the tip side of the cross-sectional line XX in FIG. 9 is removed. FIG. 11 is a perspective view of the fluid ejection device 10 shown in FIG. 9, showing a state in which a portion on the tip side of the section line XI-XI in FIG. 9 is removed.

In this embodiment, the same or similar elements as those of the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The fluid ejection device 10 according to the present embodiment has substantially the same configuration and shape in appearance as the fluid ejection device 10 according to the first embodiment described above. However, the configuration of the plurality of flow paths 20 (the first flow path 21 and the second flow path 22) differs between the fluid ejection device 10 according to the present embodiment and the fluid ejection device 10 according to the first embodiment. there is

That is, in the first flow path 21 and the second flow path 22 of the present embodiment, the flow rate of the fluid in the first flow path 21 is higher than that in the second flow path 22 in the upstream flow path 28 on the upstream side of the bent portion 25. is positioned proximate to the end from which the fluid exits (ie, fluid exit 27). Therefore, regarding the opening positions of the first flow path 21 and the second flow path 22 in the fluid inflow section 26, the opening of the first flow path 21 is closer to the fluid outflow section 27 than the opening of the second flow path 22. placed. Also, in the bent portion 25 , the cross-sectional diameter of the first flow path 21 is larger than that of the upstream flow path 28 on the upstream side, and the first flow path 21 surrounds the second flow path 22 . Further, in the downstream channel 29 on the downstream side of the bent portion 25 , the first channel 21 extends so as to surround the second channel 22 .

Note that the fluid ejection device 10 of this embodiment also includes three ribs 35 (a first rib 35a, a second rib 35b, and a third rib 35c). The second flow path 22 is arranged between the wall portion 32 and the second flow path 22 in the same manner as in the first embodiment at equal intervals and symmetrically in the circumferential direction. 21", "the first flow path 21 between the second rib 35b and the third rib 35c" and "the first flow path 21 between the first rib 35a and the third rib 35c" have substantially the same cross-sectional shape. have However, in this embodiment, these three ribs 35 (the first rib 35a, the second rib 35b, and the third rib 35c) have the same cross-sectional width and cross-sectional shape, and each rib 35 has the same cross-sectional width. It is smaller than the cross-sectional width of the channel 22 .

According to the fluid ejection device 10 according to the second embodiment, as in the fluid ejection device 10 according to the first embodiment, since the first flow path 21 is provided so as to surround the second flow path 22, the fluid ejection device The flow area of the first flow path 21 and the second flow path 22 can be made relatively large while suppressing an increase in the size of the entirety of the flow path 10 . In particular, by making the first flow path 21 surround the second flow path 22 at the bent portion 25, the cross-sectional area (flow path area) of the first flow path 21 and the second flow path 22 having a sufficient size can be increased. It is possible to moderate the degree of bending of the first flow path 21 and the second flow path 22 at the bent portion 25 while ensuring a small pressure loss. Further, according to this embodiment, the ribs 35 can be arranged with good balance.

As described above, according to the fluid ejection device 10 of the present embodiment as well, the flow paths 20 (the first flow path 21 and the second flow path 22) can be efficiently arranged in a limited space, and the flow rate can range from a small flow rate to a large flow rate. It is possible to appropriately inject fuel up to the flow rate, and to realize a flow path with small pressure loss while ensuring good strength.

The configuration of the fluid ejection device 10 according to the second embodiment is not limited to the examples shown in FIGS. 9 to 11, and various modifications are possible. Specific examples of such modifications will be described later.

<Application Fields of Fluid Ejection Device>
The fluid injection device 10 according to the present invention as described above can be suitably applied to, for example, aircraft engines, and can contribute to the reduction in size and weight of jet engines. However, the application range of the fluid injection device 10 according to the present invention is not particularly limited, and can be applied not only to aircraft engines used as civil aircraft and fighter aircraft, but also to various other devices that require fluid injection. It is possible. Therefore, the present invention can be suitably applied to devices that are required to variably inject, for example, a liquid or gaseous substance over a small flow rate to a large flow rate.

As an example, a case where the fluid injection device 10 according to the present invention is applied to a gas turbine engine will be described below.

FIG. 12 is a block diagram showing a functional configuration example of the gas turbine engine 50. As shown in FIG.

The gas turbine engine 50 includes an air supply device 51 that supplies compressed air for combustion to a combustor 52, and a turbine 53 that is fed with high-temperature, high-pressure combustion gas generated by combustion of fuel in the combustor 52 to rotate. and The fluid injection device 10 according to the present invention can be suitably used as a device that feeds fuel into the combustor 52 .

<Method for Manufacturing Fluid Ejection Device>
The fluid ejection device 10 according to the present invention as described above can be manufactured simply and with high accuracy by, for example, an AM (Additive Manufacturing) device. However, the manufacturing method of the fluid ejecting device according to the present invention is not particularly limited, and the fluid ejecting device 10 may be manufactured based on techniques other than the "three-dimensional modeling technique using an AM device".

As an example, a case in which the fluid injection device 10 according to the present invention is manufactured by an AM device (not shown) will be described below.

FIG. 13 is a flow chart showing an example of a method for manufacturing the fluid ejection device 10. As shown in FIG. The manufacturing method of the fluid ejection device 10 of this example includes the steps of specifying the three-dimensional shape data of the fluid ejection device 10 described above (S11 and S12 in FIG. 13) and the steps of converting the three-dimensional shape data into a plurality of slice data. (S13), and a step (S14) of modeling the fluid ejection device 10 by the layered manufacturing method based on the plurality of slice data. The three-dimensional shape data referred to here is data indicating the shape of the three-dimensional structure (the fluid ejection device 10). The slice data is cross-sectional data obtained by slicing the three-dimensional structure (fluid ejection device 10), and the "step of converting the three-dimensional shape data into a plurality of slice data (S13)" includes the plurality of slice data. can be performed based on any process that can be derived from the three-dimensional shape data. Each of the steps described above can be performed under the control of a controller of the AM unit and/or a controller of a control device controlling the AM unit. For example, "identification of three-dimensional shape data (see S11 and S12)" and "acquisition of slice data (see S13)" can be performed by one or more controllers.

At least a part of the flow path 20 (the first flow path 21 and the second flow path 22) included in the fluid ejection device 10 according to each of the above-described embodiments has a deformed cross section, and the fluid ejection device 10 has It has a relatively complicated channel configuration. Therefore, in the manufacturing method of this example, first, the three-dimensional shape data of the flow path 20 (the first flow path 21 and the second flow path 22) of the fluid ejection device 10 is specified (S11), and then the fluid ejection device Three-dimensional shape data of other elements of 10 are identified (S12).

The above-mentioned additive manufacturing method typically forms a layered structure by sintering metal powder with a laser, and sequentially stacks a plurality of layered structures to create a desired three-dimensional structure. Technology. The metal powder used in such an additive manufacturing method is not particularly limited, but typically powder of at least one of inconel, cobalt chromium, nickel alloy, titanium alloy and stainless steel can be used. Also, the average particle size of the powder used in the additive manufacturing method can be about 20 to 40 micrometers, preferably 20 micrometers or less.

14 to 20 are diagrams for explaining the layered manufacturing method, and are perspective views showing the state of the fluid ejection device 10 during the manufacturing process. The fluid ejection device 10 shown in FIGS. 14 to 20 has the same flow passage configuration (first flow passage 21 and second flow passage 22) as that of the fluid ejection device 10 of the first embodiment described above. In the flow path 28, the second flow path 22 is arranged closer to the fluid outlet portion 27 than the first flow path 21. It extends to surround 22.

14 to 20 show an example in which the fluid ejection device 10 is gradually manufactured from the portion shown on the left side of the drawing to the portion shown on the right side of the drawing. It is not particularly limited. Therefore, for example, the fluid ejection device 10 may be manufactured gradually from the portion shown on the lower side in FIGS. 14 to 20 toward the portion shown on the upper side.

According to the layered manufacturing method described above, the fluid ejection device 10 is gradually manufactured layer by layer, and finally the fluid ejection device 10 having a desired flow path configuration can be manufactured with high accuracy.

<Modification>
The configuration of the fluid ejection device 10 described above is merely an example, and various modifications can be made to the fluid ejection device 10 . Specific modified examples will be described below.

<Modified example of cross-sectional shape of channel>
21 to 34 show examples of cross-sectional shapes of the plurality of flow paths 20 (the first flow path 21 and the second flow path 22) provided in the fluid ejection device 10. FIG. The cross-sectional shape of each flow channel 20 (the first flow channel 21 and the second flow channel 22) is not particularly limited, and the cross-sectional shape of each flow channel may be a circular shape (including a perfect circular shape and an elliptical shape), a polygonal shape ( triangular, square and pentagonal) and other shapes are possible. Also, the relative positional relationship between the flow paths 20 is not particularly limited. Other channels 20, such as the second channel 22, may be located off the center of the plane. Also, the fluid ejection device 10 may include three or more flow paths 20 . Further, the plurality of flow paths 20 included in the fluid ejection device 10 may have different cross-sectional shapes, or may include two or more flow paths 20 having the same cross-sectional shape.

Also, the manner in which the first flow path 21 surrounds other flow paths (the second flow path 22, etc.) is not particularly limited. The first channel 21 may surround only part of the periphery of the channel. In addition, the manner in which the first flow path 21 surrounds other flow paths (second flow path 22, etc.) may be the same over the bent portion 25 and the area downstream of the bent portion 25 (downstream flow path 29). , the first flow path 21 may surround other flow paths (second flow path 22, etc.) in a plurality of modes in the bent portion 25 and the downstream area (downstream flow path 29) of the bent portion 25.

For example, in the example shown in FIG. 21, the second flow path 22 has an "elliptical cross section with the major axis set in the horizontal direction in the drawing", and the first flow path 21 also has a laterally elongated torus-shaped cross section.

In the example shown in FIG. 22 , the second flow path 22 has an “elliptical shape with a long axis set in the vertical direction in the drawing” in cross section, and the first flow path 21 has a “longer axis than in the horizontal direction in the drawing”. It has a longitudinally elongated ring-shaped cross section.

In the example shown in FIG. 23, the second flow path 22 has a circular (specifically elliptical) cross section, and the first flow path 21 has a ring-shaped cross section with a triangular outer shape.

In the example shown in FIG. 24, the second flow path 22 has a circular (specifically elliptical) cross-section, and the first flow path 21 has a ring-shaped cross section with a rectangular outer shape.

In the example shown in FIG. 25, the second flow path 22 has a circular (specifically elliptical) cross section, and the first flow path 21 has a ring-shaped cross section with a pentagonal outline.

The first channel wall portion 31 and the second channel wall portion 32 may be connected via a rib 35 (see FIGS. 21 to 25), or the first channel wall portion 31 and the second channel wall portion 31 may be connected to each other. It may be directly connected to the road wall portion 32 and configured integrally (see FIG. 23).

In the example shown in FIG. 26, the second flow path 22 has a circular (specifically, perfect circular) cross section, the first flow path 21 has an annular cross section, and the first flow path The wall portion 31 and the second flow path wall portion 32 are connected via ribs 35 . The cross-sectional width of the rib 35 is larger than the cross-sectional width of the second flow path 22 and smaller than the cross-sectional width of the first flow path 21 .

In the example shown in FIG. 27, the second flow path 22 has a circular (specifically, perfect circular) cross section, the first flow path 21 has an annular cross section, and the first flow path The wall portion 31 and the second flow path wall portion 32 are connected via a plurality of ribs 35 (two ribs 35). The plurality of ribs 35 (two ribs 35) are disposed at positions facing each other with the second flow path 22 interposed therebetween, and have cross-sectional shapes different from each other. In this example, the cross-sectional width of one rib 35 is larger than the cross-sectional width of the second flow path 22 , and the cross-sectional width of the other rib 35 is smaller than the cross-sectional width of the second flow path 22 .

In the example shown in FIG. 28, the second flow path 22 has a circular (specifically, perfect circular) cross section, the first flow path 21 has an annular cross section, and the first flow path The wall portion 31 and the second flow path wall portion 32 are connected via a plurality of ribs 35 (two ribs 35). The plurality of ribs 35 (two ribs 35) are arranged at positions facing each other with the second flow path 22 interposed therebetween, and have the same cross-sectional shape. In this example, the cross-sectional width of each rib 35 is smaller than the cross-sectional widths of the first channel 21 and the second channel 22 .

In the example shown in FIG. 29, the second flow path 22 has a circular (specifically, perfect circular) cross section, and the first flow path 21 is part of the second flow path 22 (shown in FIG. 29). In the example, the cross section is such that it covers the lower side in the figure), and the first channel wall portion 31 and the second channel wall portion 32 are directly connected.

In the example shown in FIG. 30, three flow paths 20 are provided. That is, the second flow path 22 and the third flow path 23 are arranged side by side, and the first flow path 21 is provided so as to surround the second flow path 22 and the third flow path 23 . The second flow path 22 and the third flow path 23 have circular (specifically, perfect circular) cross sections, and the first flow path 21 has an annular cross section. In this example, the second channel wall portion 32 forms the second channel 22 and the third channel 23 , and the first channel wall portion 31 and the second channel wall portion 32 are connected via the rib 35 . ing.

In the example shown in FIG. 31 , the second flow path 22 is provided at a position off the center of the cross section of the first flow path 21 . In the illustrated example, the first flow path 21 and the second flow path 22 have a circular cross section (specifically, a true circular shape).

In the example shown in FIG. 32, the first channel 21, the second channel 22, the first channel wall 31, the second channel wall 32, and the rib 35 have the same cross-sectional shape as the example shown in FIG. However, the position of the rib 35 is provided on the left side in the figure.

In the example shown in FIG. 33, the first channel 21, the second channel 22, the first channel wall 31, the second channel wall 32, and the rib 35 have the same cross-sectional shape as the example shown in FIG. However, the position of the rib 35 is provided on the lower side in the figure.

In the example shown in FIG. 34, the second flow path 22 has a rectangular (specifically square) cross section, the first flow path 21 has a ring-shaped cross section with a rectangular outer shape, The first channel wall portion 31 and the second channel wall portion 32 are connected via ribs 35 .

Each flow path 20 (first flow path 21, second flow path 22, and third flow path 23) is at least part of the bent portion 25 and the downstream flow path 29, any of FIGS. 21 to 34 It is possible to have the cross-sectional shapes shown in one or more drawings.

<Modified Example of Connection Mode of First Channel Wall 31 and Second Channel Wall 32>
FIG. 35 is a vertical cross-sectional view of the fluid ejection device 10 in which the vicinity of the downstream flow path 29 of the first flow path 21 and the second flow path 22 is partially extracted. FIG. 4 is a diagram for explaining an example of a connection mode of a wall portion 32; In this example, the second flow path wall portion 32 is directly connected to the first flow path wall portion 31 in at least the entire downstream flow path 29 of the downstream flow path 29 and the bent portion 25. The first channel wall portion 31 and the second channel wall portion 32 are integrally formed.

FIG. 36 is a vertical cross-sectional view of the fluid ejection device 10 in which the vicinity of the downstream flow path 29 of the first flow path 21 and the second flow path 22 is partially extracted. FIG. 4 is a diagram for explaining an example of a connection mode of a wall portion 32; In this example, in at least the entire area of the downstream channel 29 out of the downstream channel 29 and the bent portion 25, the plurality of The second channel wall portion 32 is intermittently connected to the first channel wall portion 31 via the ribs 35 .

FIG. 37 is a vertical cross-sectional view of the fluid ejection device 10 in which the vicinity of the downstream flow path 29 of the first flow path 21 and the second flow path 22 is partially extracted. FIG. 4 is a diagram for explaining an example of a connection mode of a wall portion 32; FIG. 38 is a view of the fluid ejection device 10 (fluid outflow portion 27) viewed from arrow B in FIG. In this example, each of the plurality of ribs 35 extends in the extending direction of the flow path 20 (fuel flow direction) in at least the entire area of the downstream flow path 29 out of the downstream flow path 29 and the bent portion 25 . , the second flow path wall portion 32 is continuously connected to the first flow path wall portion 31 via the plurality of ribs 35 .

<Flow path not including bent portion>
In the fluid ejection device 10 according to each of the embodiments described above, each flow path 20 (the first flow path 21, the second flow path 22, and the third flow path 23) has the bent portion 25. The portion 25 may not be provided.

FIG. 39 is a vertical cross-sectional view of the fluid ejection device 10 showing a modified example of the fluid ejection device 10, and shows an example of the fluid ejection device 10 that does not include a bent portion. FIG. 40 is a view of the fluid ejection device 10 (fluid outflow portion 27) viewed from arrow C in FIG. FIG. 41 is a cross-sectional view of fluid ejection device 10 taken along section line XLI-XLI in FIG. FIG. 42 is a cross-sectional view of fluid ejection device 10 taken along section line XLII-XLII in FIG. 43 is a cross-sectional view of fluid ejection device 10 taken along section line XLIII-XLIII in FIG.

In the fluid ejection device 10 of this example, the first flow path 21 and the second flow path 22 linearly extend from the fluid inflow portion 26 to the fluid outflow portion 27 . Also in this example, the plurality of flow paths 20 (the first flow path 21 and the second flow path 22) are arranged side by side in the fluid inflow portion 26, but in the process from the fluid inflow portion 26 to the fluid outflow portion 27, , the cross-sectional diameter of the first flow path 21 increases so that the first flow path 21 gradually surrounds the second flow path 22 (see FIGS. 41 to 43). In the fluid outflow portion 27, the first flow path 21 surrounds the second flow path 22, and the first flow path wall portion 31 is connected to the second flow path wall portion 32 via the ribs 35 (see FIG. 40). .

<Representative aspects and effects>
Typical features and effects of the "fluid injection device 10", "gas turbine engine 50", and "method for manufacturing the fluid injection device 10" described above are enumerated below for each aspect, but the present invention is as follows: It does not necessarily have to conform to the aspects, and may be based on other aspects.

[First aspect]
The fluid ejection device 10 includes at least two flow paths 20 (the first flow path 21 and the second flow path 22 (and the third flow path 23) in each of the above-described embodiments and modifications). 20 are arranged side by side at the end (fluid inflow portion 26) into which the fluid (fuel) flows in, and are arranged in one channel (first flow channel 21) at the end (fluid outflow portion 27) from which the fluid flows out. is provided so as to surround at least one other channel (the second channel 22 (and the third channel 23)).

According to this aspect, the fluid ejecting device 10 includes at least two flow paths 20. These flow paths 20 are provided side by side on the upstream side, and one flow path 20 (first flow path 21) on the downstream side. ) is deformed such as enlarged, and the one flow path 20 is provided so as to surround at least one other flow path (the second flow path 22 and the third flow path 23). Since one flow path 20 surrounds at least one other flow path 20 on the downstream side in this way, the fluid ejection device 10 can be compared to the case where "two or more flow paths 20 are provided side by side on the downstream side." , it is possible to appropriately inject a fluid from a small flow rate to a large flow rate without increasing the size. Moreover, at least one other flow path 20 is surrounded by one flow path 20, so that the at least one other flow path 20 is less likely to be affected by the outside. For example, the temperature of the fluid flowing through at least one other flow path 20 (the second flow path 22 and the third flow path 23) changes (rises and falls) even when the temperature around the fluid ejection device 10 changes. It is difficult to remove, and the temperature fluctuation of the fluid can be mitigated.

Note that the channel 20 may or may not be curved. Also, the number of channels 20 is typically two, but three or more channels may be provided. Also, the arrangement of the plurality of flow paths 20 is not particularly limited, and the plurality of flow paths can be arranged horizontally or vertically with reference to the downstream direction. In addition, the form of the portion surrounding at least one other flow path 20 in one flow path 20 is not particularly limited, and a symmetrical cross-sectional shape (for example, a line-symmetrical cross-sectional shape (annular cross-sectional shape, triangular outer shape) It may have a circular cross-sectional shape, a rectangular cross-sectional shape, or a polygonal cross-sectional shape, etc.)), or may have an asymmetrical cross-sectional shape.

[Second aspect]
Each of the at least two flow paths 20 has a bent portion 25, and one flow path 20 (first flow path 21) has a larger cross-sectional diameter than the upstream side at least at the bent portion 25 and at least one other It may be provided so as to surround two channels (the second channel 22 (and the third channel 23)).

According to this aspect, each channel 20 is bent in the middle, and at least at the bent portion 25, the cross-sectional area of one channel 20 (first channel 21) is larger than that on the upstream side. channel 20 (first channel 21) can surround at least one other channel (second channel 22 (and third channel 23)). By enlarging one flow path 20 to surround at least one other flow path 20 at the bent portion 25 in this manner, the pressure loss in the one flow path 20 can be significantly reduced.

[Third aspect]
The at least two flow paths 20 include a first flow path 21 and a second flow path 22, and the first flow path 21 and the second flow path 22 are located upstream of the bend 25 from the first flow path 21. Also, the second flow path 22 is arranged closer to the end portion (fluid outflow portion 27) from which the fluid flows out, and at the bent portion 25, the cross-sectional diameter of the bent portion 25 of the first flow path 21 is larger than that on the upstream side. The first flow path 21 may be large and surround the second flow path 22 , and the first flow path 21 may extend so as to surround the second flow path 22 downstream of the bent portion 25 .

According to this aspect, the first flow path 21 and the second flow path 22 can be arranged side by side on the upstream side, and one flow path (the first flow path 21) The cross-sectional area of the (first channel 21) can be made larger than the cross-sectional area of another channel (the second channel 22), and can be expanded so as to surround the other channel (the second channel 22). By arranging the first flow path 21 and the second flow path 22 in this way, it is possible to increase the cross-sectional area of the first flow path 21 at the bent portion 25 while suppressing the overall size of the fluid ejection device 10 . be. Further, the flow path 20 having a relatively large cross-sectional area can have a smaller curvature than the flow path 20 having a relatively small cross-sectional area. ) can effectively reduce the pressure loss at the bent portion 25 . Note that in this aspect, a plurality of flow paths can be arranged vertically with reference to the downstream direction.

[Fourth aspect]
The at least two flow paths 20 include a first flow path 21 and a second flow path 22, and the first flow path 21 and the second flow path 22 are located upstream of the bend 25 relative to the second flow path 22. The first flow path 21 is arranged closer to the end portion (fluid outflow portion 27) from which the fluid flows out, and at the bent portion 25, the cross-sectional diameter of the first flow path 21 is larger than that on the upstream side and the first flow The channel 21 may surround the second channel 22 , and the first channel 21 may extend to surround the second channel 22 downstream of the bend 25 .

According to this aspect, the first flow path 21 and the second flow path 22 can be arranged side by side on the upstream side, and one flow path (the first flow path 21) The cross-sectional area of the (first channel 21) can be made larger than the cross-sectional area of another channel (the second channel 22), and can be expanded so as to surround the other channel (the second channel 22). By arranging the first flow path 21 and the second flow path 22 in this way, it is possible to increase the cross-sectional area of the first flow path 21 at the bent portion 25 while suppressing the overall size of the fluid ejection device 10 . It is possible to effectively reduce the pressure loss at the bent portions 25 of the first flow path 21 and the second flow path 22 (especially the first flow path 21).

[Fifth aspect]
The cross section of the first flow path 21 may have a line-symmetrical shape at least downstream of the bent portion 25 .

According to this aspect, one flow path (first flow path 21) can be provided so as to surround another flow path (second flow path 22) in line symmetry. The line symmetry here includes, for example, a case of line symmetry with respect to a direction that coincides with the direction in which the upstream side of the flow path is directed. The cross-sectional shape (line-symmetrical shape) of such "one channel (first channel 21) that surrounds another channel (second channel 22) in line symmetry" is not particularly limited. It may be circular, triangular, square or other polygonal shape. By adopting the configuration of this aspect, the fluid from the upstream flows symmetrically toward the downstream, so that the fluid flows smoothly and the pressure loss can be effectively reduced.

[Sixth aspect]
The cross section of the first flow path 21 may have an annular shape at least downstream of the bent portion 25 .

According to this aspect, one flow path (first flow path 21) can be provided so as to annularly surround another flow path (second flow path 22). In this way, even when each flow channel 20 is provided with the bent portion 25, the flow channels 20 are arranged vertically with respect to the downstream direction, and the surrounding structure between the flow channels 20 is line symmetrical (for example, the first flow By making the cross-sectional shape of the channel 21 to be circular and line symmetrical, it is possible to eliminate corners on the downstream side of the first channel 21, and the fluid flow becomes smooth, effectively reducing pressure loss. can be reduced.

[Seventh aspect]
The at least two channels 20 may include a linearly extending first channel 21 and a second channel 22 .

As in this aspect, the present invention can be applied even when the first flow path 21 and the second flow path 22 do not include a bent portion, and the flow path 20 can be efficiently arranged in a limited space. It is possible to realize the fluid ejection device 10 including the flow path 20 that is capable of ejecting a fluid from a small flow rate to a large flow rate, has good strength, and has a small pressure loss.

[Eighth aspect]
The wall portion (second flow channel wall portion 32) forming the second flow channel 22 is arranged outside the wall portion (second flow channel wall portion 32) forming the second flow channel 22. It may be connected to a wall portion (first channel wall portion 31) forming the channel 21 via a holding portion (rib 35).

According to this aspect, another flow path (second flow path 22) is provided on the wall surface (inner wall surface) of the first flow path wall portion 31 that forms the one flow path (first flow path 21). It can be firmly held by the holding portion (rib 35) provided. Therefore, even if an external force is applied to the fluid ejection device 10 , the second flow path 22 is stably held inside the first flow path 21 . The form of the holding part is not particularly limited. One or more retainers may be provided that extend continuously (integrally) or discontinuously (intermittently) with respect to the fluid flow direction.

[Ninth aspect]
The wall portion (second flow channel wall portion 32) forming the second flow channel 22 is formed through two or more holding portions (ribs 35), and the wall portion forming the first flow channel 21 (first flow channel wall portion 31).

According to this aspect, a plurality of holding portions (ribs 35) can be provided, and the second flow path 22 can be held in good balance. The form of the holding part is not particularly limited. A plurality of holding portions may be provided that extend continuously (integrally) or discontinuously (intermittently) with respect to the flow direction of the fluid. Moreover, the plurality of holding portions may have different cross-sectional widths (sizes in the cross section), or may have the same cross-sectional widths.

[Tenth Aspect]
The two or more holding portions (ribs 35) may include a plurality of holding portions having mutually different cross-sectional widths.

According to this aspect, at least two holding portions (ribs 35) are provided, and the cross-sectional width of one holding portion (rib 35) in the bent portion 25 of the flow channel 20 is set to "at least one other flow channel 20 (the second The cross-sectional width of the second flow path 22 (and the third flow path 23) can be made larger than the cross-sectional width of the other holding portion (rib 35), and the cross-sectional width of the other holding portion (rib 35) can be made smaller than the width of the one holding portion. In this way, since strength is ensured by one of the two or more holding portions having a relatively large cross-sectional width, the cross-sectional width of the other holding portion is reduced to ensure strength. can weaken the intensity of As a result, the size of the fluid ejection device 10 can be reduced. The form of the holding part is not particularly limited. A plurality of holding portions may be provided that extend continuously (integrally) or discontinuously (intermittently) with respect to the flow direction of the fluid.

[Eleventh aspect]
The holding portion (rib 35 ) may include a holding portion (rib 35 ) having a cross-sectional width larger than the cross-sectional width of the second flow path 22 .

According to this aspect, in the bent portion 25 , the cross-sectional width of the holding portion (rib 35 ) can be made larger than the cross-sectional width of the second flow path 22 . By doing so, the relative position of the second flow path 22 with respect to the first flow path 21 can be stably determined while appropriately positioning the second flow path 22 . The form of the holding part is not particularly limited. One or more retainers may be provided that extend continuously (integrally) or discontinuously (intermittently) with respect to the fluid flow direction.

[Twelfth aspect]
The gas turbine engine 50 includes the fluid injection device 10 described above, and fluid fuel is flowed through at least two flow paths 20 of the fluid injection device 10 .

According to this aspect, it is possible to appropriately inject fluid fuel from a small flow rate to a large flow rate from the fluid injection device 10 while suppressing an increase in the size of the fluid injection device 10 . Therefore, it is possible to provide the gas turbine engine 50 that can be flexibly adapted to various flow rates of the fluid fuel while effectively miniaturizing it.

[Thirteenth Aspect]
A method for manufacturing the fluid ejection device 10 includes steps of specifying three-dimensional shape data of the fluid ejection device 10 described above, converting the three-dimensional shape data into a plurality of slice data, and performing layered manufacturing based on the plurality of slice data. and forming the fluid ejection device 10 by a method.

According to this aspect, it is possible to easily and highly accurately manufacture the fluid ejection device 10 capable of appropriately ejecting a fluid from a small flow rate to a large flow rate while suppressing an increase in size.

[14th aspect]
The additive manufacturing method may use powders of at least one of Inconel, cobalt chromium, nickel alloys, titanium alloys and stainless steel.

According to this aspect, it is possible to manufacture the fluid ejection device 10 having excellent high temperature resistance.

[15th Aspect]
The average particle size of the powder may be 20 micrometers or less.

According to this aspect, it is possible to manufacture the fluid ejection device 10 having excellent high temperature resistance.

[Sixteenth Aspect]
At least two flow paths included in the fluid ejection device may include flow paths whose cross sections are deformed at least in part.

According to this aspect, even a fluid ejection device including a complicated flow path can be reliably and highly accurately manufactured.

The present invention is not limited to the above-described embodiments and modifications, and may include various aspects with various modifications that can be conceived by those skilled in the art. is not limited to the matters of Therefore, various additions, changes, and partial deletions can be made to each element described in the claims and the specification without departing from the technical idea and spirit of the present invention.

10 Fluid ejection device 10a Fluid ejection device 20 Flow path 21 First flow path 22 Second flow path 23 Third flow path 25 Bent portion 26 Fluid inflow portion 27 Fluid outflow portion 28 Upstream flow passage 29 Downstream flow passage 31 First Channel wall portion 32 Second channel wall portion 35 Rib 35a First rib 35b Second rib 35c Third rib 50 Gas turbine engine 51 Air supply device 52 Combustor 53 Turbine

Claims (12)

A fluid ejection device comprising at least two flow paths,
The at least two channels are
The wall surfaces of the flow paths are smoothly connected independently from the end where the fluid flows in to the end where the fluid flows out,
arranged side by side at the ends into which the fluid flows,
At the end from which the fluid flows out, one channel is provided so as to surround at least one other channel,
each of the at least two channels having a bend;
The one flow path has a cross-sectional diameter larger than that of the upstream side at least at the bent portion and is provided so as to surround at least one other flow path,
the at least two flow paths include a first flow path and a second flow path;
The first flow path and the second flow path are
On the upstream side of the bent portion, the second flow path is arranged closer to the end from which the fluid flows than the first flow path, and
In the bent portion, the cross-sectional diameter of the first flow path is larger than that on the upstream side, and the first flow path surrounds the second flow path,
The fluid ejection device , wherein the first flow path extends to surround the second flow path on the downstream side of the bent portion . 2. The fluid ejection device according to claim 1 , wherein the cross section of the first flow path has a line-symmetrical shape at least downstream of the bent portion. 3. The fluid ejection device according to claim 2 , wherein the cross section of the first flow path has an annular shape at least on the downstream side of the bent portion. A wall portion forming the second flow path is connected via a holding portion to a wall portion forming the first flow path arranged outside the wall portion forming the second flow path. The fluid ejection device according to any one of claims 1 to 3 . 5. The fluid ejection device according to claim 4 , wherein a wall portion forming the second flow path is connected to a wall portion forming the first flow path via two or more of the holding portions. 6. The fluid ejection device according to claim 5 , wherein the two or more holding portions include a plurality of holding portions having different cross-sectional widths. The fluid ejection device according to any one of claims 4 to 6 , wherein the holding portion includes a holding portion having a cross-sectional width larger than the cross-sectional width of the second flow path. A fluid injection device according to any one of claims 1 to 7 ,
A gas turbine engine in which fluid fuel is flowed through said at least two flow paths of said fluid injection device. a step of specifying three-dimensional shape data of the fluid ejection device according to any one of claims 1 to 7 ;
converting the three-dimensional shape data into a plurality of slice data;
A method of manufacturing a fluid ejection device, comprising: modeling the fluid ejection device by a layered manufacturing method based on the plurality of slice data. 10. The method of manufacturing a fluid ejection device according to claim 9 , wherein the additive manufacturing method uses powder of at least one of Inconel, cobalt chromium, nickel alloy, titanium alloy, and stainless steel. 11. The method of manufacturing a fluid ejection device according to claim 10 , wherein the powder has an average particle size of 20 micrometers or less. 12. The method of manufacturing a fluid ejection device according to claim 9 , wherein the at least two flow paths provided in the fluid ejection device include flow paths whose cross sections are deformed at least partially.

Images