CN118273977A - Forward tilting type casing for expanding stability of air compressor and air compressor - Google Patents
Forward tilting type casing for expanding stability of air compressor and air compressor Download PDFInfo
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- CN118273977A CN118273977A CN202410415916.7A CN202410415916A CN118273977A CN 118273977 A CN118273977 A CN 118273977A CN 202410415916 A CN202410415916 A CN 202410415916A CN 118273977 A CN118273977 A CN 118273977A
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- moving blade
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- 230000003416 augmentation Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a forward tilting casing for expanding stability of a gas compressor and the gas compressor. The casing comprises a casing main body which is arranged on the movable blade; the multiple casing processing structures are arranged on the casing main body, deflect a first preset angle along the radial direction along the rotating direction of the movable blade, are uniformly distributed in the front edge area of the movable blade along the circumferential direction, and are projected into a forward tilting structure in the reverse main flow direction. The case treatment structure arranged on the case main body is configured into a shape inclined against the main flow direction so as to change the outlet direction of the internal circulating flow, reduce the mixing loss of the main flow and the jet flow, and reduce the overall entropy production. The inside of the casing main body is provided with casing treatment structures which are uniformly arranged at intervals along the circumferential direction, the casing treatment structures have the trend of inclining against the main flow direction, the mixing loss of jet flow and main flow in the casing treatment structures is reduced, and a larger stability margin is obtained while the negative influence on peak efficiency is reduced.
Description
Technical Field
The invention relates to the field of compressors and aerodynamic thermomechanics, in particular to a forward tilting casing for expanding and stabilizing a compressor and the compressor.
Background
Rotating stall and surge are considered to be the most serious problems in the field of impeller machinery, and the two unstable phenomena seriously threaten the safe and stable operation of an engine, the light engine performance is deteriorated, the heavy engine is flameout, and all costs are required to be avoided.
In many active and passive control technologies, the casing treatment is favored by engineers and scientific workers due to the advantages of simple structure, small change to the original configuration and the like, has gradually developed into one of the stability-expanding measures with wide application, and is applied to many practical models.
The configuration of the case treatment can be mainly divided into an axial slot and a circumferential slot, and the circumferential slot case treatment can obtain moderate margin widening under the condition of smaller peak efficiency loss, compared with the axial slot case treatment, the axial slot case treatment has larger stability expanding potential and more obvious stability margin improvement, so that more attention is paid, but the application of the axial slot case treatment can increase the loss of a movable blade end region and has larger negative influence on peak efficiency, which is one of important factors restricting the practical application of the axial slot case treatment. It has been found that the negative effect of the axial slot casing treatment on efficiency is mainly due to the viscous shear of the circulating flow inside the casing treatment and the main flow inside the vane passage, and the greater the included angle formed by the two flows, the greater the entropy production loss caused by the viscous shear and the greater the negative effect on efficiency.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a forward tilting casing for expanding and stabilizing a compressor and the compressor.
One aspect of an embodiment of the present invention provides a forward tilting casing for compressor stability augmentation, including:
the casing body is arranged on the movable blade;
The multiple casing processing structures are arranged on the casing main body, deflect a first preset angle along the radial direction along the rotation direction of the movable blade, and are uniformly distributed in the front edge area of the movable blade along the circumferential direction, wherein the meridian plane projection of the casing processing structures is a forward-inclined structure in the reverse main flow direction.
According to an embodiment of the present invention, the forward tilting structure is configured to deflect the casing handling structure by a second predetermined angle along an axial direction opposite to the main flow direction.
According to the embodiment of the invention, the molded line of the meridian plane is a B-spline curve or a Bezier curve, and the radial molded line processed by the casing intersects with the inner wall of the casing main body.
According to the embodiment of the invention, the tangential line of the meridian plane at the target intersection point with the inner wall of the casing body has an included angle smaller than 90 degrees with the axial direction.
According to the embodiment of the invention, the profile of the meridian plane axially covers the front edge point of the movable blade, the axial chord length of the movable blade top of the profile and the inner wall of the casing body is 20% -40% of the axial chord length of the movable blade top of the movable blade at the target intersection point, the height of the casing treatment structure is 20% -50%, and the length of the casing treatment structure is 30% -70% of the axial chord length of the movable blade top.
According to an embodiment of the present invention, the first preset angle is 30 ° to 60 °.
According to the embodiment of the invention, the number of the case processing structures in the front edge area of each movable blade is 2-10.
According to the embodiment of the invention, the circumferential open area ratio of the casing treatment structure is 0.2-0.5.
According to an embodiment of the present invention, an interface between the case processing structure and the case main body includes a polygonal shape or a folded line shape.
Another aspect of an embodiment of the present invention provides a compressor including: the forward tilting casing as described above.
According to the embodiment of the invention, the casing treatment structure arranged on the casing main body is configured into the shape inclined against the main flow direction, so that the outlet direction of the internal circulating flow can be changed, the mixing loss of the main flow and the jet flow is reduced, and the overall entropy production is reduced. Meanwhile, the casing treatment structures which are uniformly arranged at intervals along the circumferential direction are formed in the casing main body, the casing treatment structures have the tendency of inclining in the direction of the reverse main flow, the mixing loss of jet flow and the main flow in the casing treatment structures is reduced, and a larger stability margin is obtained while the negative influence on peak efficiency is reduced.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 schematically shows a schematic cross-sectional view of a forward tilting casing according to an embodiment of the invention;
Fig. 2A schematically illustrates a front view of a forward tilting receiver according to an embodiment of the invention;
FIG. 2B schematically illustrates a left side view of a forward-tilting receiver according to an embodiment of the invention;
Fig. 3 schematically illustrates a schematic diagram of suction and ejection of a forward-tilting receiver handling structure according to an embodiment of the invention;
FIG. 4 schematically illustrates a jet-to-main flow blending schematic of a different configuration of case treatment structure according to an embodiment of the present invention;
Fig. 5 schematically shows a schematic design of a forward-tilting casing handling structure according to an embodiment of the invention.
In the drawings, the reference numerals specifically have the following meanings:
1-moving blades; 2-a case processing structure; 3-a casing body; 4-target intersection.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a convention should be interpreted in accordance with the meaning of one of skill in the art having generally understood the convention (e.g., "a system having at least one of A, B and C" would include, but not be limited to, systems having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
Fig. 1 schematically shows a schematic cross-sectional view of a forward tilting casing according to an embodiment of the invention.
As shown in fig. 1, a forward tilting casing for compressor stabilization includes:
The casing body 3 is arranged on the movable blade 1;
The multiple casing processing structures 2 are arranged on the casing main body 3, the casing processing structures 2 deflect a first preset angle along the rotation direction of the rotor blade along the radial direction, and the multiple casing processing structures 2 are uniformly distributed in the front edge area of the rotor blade 1 along the circumferential direction, wherein the meridian plane projection of the casing processing structures 2 is a forward-inclined structure in the reverse main flow direction.
According to the embodiment of the invention, the first preset angle can be specifically set according to actual requirements, for example, can be set to be 30-60 degrees. The number of the case handling structures 2 in the leading edge region of each of the buckets 1 is 2 to 10, and generally 4 to 8 may be provided.
In one embodiment, a low-speed single-rotor axial flow compressor was selected as the subject, and the design parameters of the compressor are shown in table 1.
Table 1 single-vane design parameters for compressors
According to the embodiment of the invention, the casing treatment structure 2 arranged on the casing main body 3 is configured into a shape inclined against the main flow direction, so that the outlet direction of the internal circulating flow can be changed, the mixing loss of the main flow and the jet flow can be reduced, and the overall entropy production can be reduced. Meanwhile, the case treatment structures 2 which are uniformly arranged at intervals along the circumferential direction are formed in the case main body 3, the case treatment structures 2 have the tendency of inclining in the reverse main flow direction, the mixing loss of jet flow and main flow in the case treatment structures 2 is reduced, and a large stability margin is obtained while the negative influence on peak efficiency is reduced.
According to an embodiment of the present invention, the forward tilting structure deflects the casing handling structure 2 by a second preset angle in an axial reverse main flow direction.
According to the embodiment of the invention, the profile of the meridian plane is a B-spline curve or a Bezier curve, and the radial profile of the casing treatment intersects with the inner wall of the casing main body 3.
Fig. 2A schematically illustrates a front view of a forward tilting case according to an embodiment of the present invention. Fig. 2B schematically illustrates a left side view of a forward tilting case according to an embodiment of the present invention.
According to the embodiment of the invention, when the molded line is a B-spline curve, the molded line of the B-spline curve can be adjusted through a plurality of control points.
In a specific embodiment, see fig. 2A and 2B, the meridian line of the case handling structure is a B-spline curve and intersects the inner wall of the case body 3, mainly adjusted by 7 control points. The control points can be divided into three groups, the two control points at the lower layer are overlapped with the inside of the casing to mainly control the axial position and the length of the casing processing structure 2, the two control points at the middle layer control the concave-convex property of the casing processing structure 2, the three control points at the upper layer control the height and the front-back inclination degree of the casing processing structure 2, and the configuration of the casing processing structure 2 of different types can be obtained by changing the relative positions of the 7 control points. Wherein L represents the length of the casing handling structure 2, H represents the height of the casing handling structure 2, D represents the degree of fore-and-aft tilting of the casing handling structure 2, OAR represents the circumferential opening ratio of the casing handling structure 2, and θ represents the radial tilting angle of the casing handling structure 2.
According to the embodiment of the invention, the meridian line of the casing processing structure 2 is forward inclined, and the upper three control points move forward in the reverse main flow direction, so that the integral meridian line of the casing processing structure 2 has a forward inclined structure.
According to an embodiment of the invention, the tangential line of the meridian plane at the target intersection point 4 with the inner wall of the casing body 3 forms an angle smaller than 90 degrees with the axial direction.
According to the embodiment of the invention, the profile of the meridian plane axially covers the front edge point of the movable blade 1, the profile and the inner wall of the casing main body 3 are 20% -40% of the axial chord length of the top of the movable blade 1 from the front edge point of the movable blade 1 at the target intersection point 4, the height of the casing processing structure 2 is 20% -50% of the axial chord length of the top of the movable blade 1, and the length of the casing processing structure 2 is 30% -70% of the axial chord length of the top of the movable blade 1.
Fig. 3 schematically shows a schematic drawing of the suction and ejection of the forward-tilting casing handling structure 2 according to an embodiment of the invention.
According to the embodiment of the invention, the circumferential open area ratio of the casing treatment structure 2 is 0.2-0.5.
According to the embodiment of the invention, as shown in fig. 3, the low-energy fluid in the channel is sucked into the casing processing structure 2 at the downstream of the casing processing structure 2 and forms an internal circulating flow, and then is sprayed from the front edge of the casing processing structure 2 and converged into the main flow, so that the higher the axial momentum of the injection of the casing processing structure 2 is, the better the stability expanding effect is, by reducing the internal blockage of the channel and widening the stability margin of the compressor, driven by the pressure difference of the pressure surface and the suction surface of the blade (i.e. the movable blade 1). Considering that the injection axial momentum of the case processing structure 2 increases and then decreases along with the increase of the forward tilting degree D, the value range of the parameter D (namely the height of the case processing structure 2) is 20% -50% of the axial chord length of the blade tip of the movable blade to ensure better stability expansion capability.
According to the embodiment of the invention, the control point at the upper part of the middle layer moves forward against the main flow direction, so that the tangential line of the meridian line (namely the line of the meridian surface) of the casing treatment structure 2 is smaller than 90 degrees with the axial included angle alpha at the intersection point (namely the target intersection point 4) at the upper part of the inner wall of the casing main body 3, and the jet flow direction of the casing treatment structure 2 is controlled. According to the fluid dynamics equation, the blending loss of jet flow and main flow is closely related to the jet flow angle, and the entropy change in the blending process is shown in the formula (1):
Wherein f 1 and f 2 are functions of the mach number of the main flow, T t is the total temperature of the main flow, T tinj is the total temperature of the jet flow, u is the axial speed, and alpha is the included angle between the jet flow and the main flow.
Fig. 4 schematically shows a schematic view of jet-to-main flow blending of a different configuration of a casing treatment structure 2 according to an embodiment of the invention.
According to an embodiment of the present invention, referring to fig. 4, a schematic diagram of mixing jet flow and main flow of a forward-inclined type, semicircular type and backward-inclined type casing treatment structure 2 is shown, for three different configurations of casing treatment structures 2, main flow parameters are certain, and the total difference of the temperature of the circulation flow and the main flow inside the casing treatment structure 2 is small, so that the entropy production loss in the mixing process is mainly affected by the jet flow angle. From equation (1), the smaller the jet angle, the smaller the blending loss, and when the jet angle α is smaller than 90 degrees, the negative effect of the case handling structure 2 on efficiency is minimal. The low-entropy-yield casing processing structure 2 configuration with both efficiency and margin can be realized through the forward-tilting design.
According to the embodiment of the invention, the 2 meridian line of the casing treatment structure covers the front edge point of the movable blade. The leakage flow of the clearance of the blade top of the air compressor is generated at the front edge, when the flow of the air compressor is reduced, the internal reverse pressure gradient of the blade channel is gradually increased, the fluctuation intensity of the leakage flow is increased, and the inside of the channel is easily blocked. When the casing treatment structure 2 covers the front edge, the suction and injection effects can be fully exerted, the strength of leakage flow is reduced, and the flow field of the blade end region is improved, so that the radial line of the casing treatment structure 2 and the inner wall of the casing main body 3 are set to be 20% -40% of the axial chord length of the blade tip at the distance from the front edge point of the blade at the upstream intersection point.
The experimental and numerical simulation calculation results show that the longer the length and the higher the height of the casing processing structure 2, the better the stability expanding effect is, but the greater the negative influence on the efficiency is. To achieve a low entropy yield expanded design, according to embodiments of the present disclosure, the height of the case handling structure 2 is configured to be 20% -50% of the bucket tip axial chord length, and the length of the case handling structure 2 is configured to be 30% -70% of the bucket tip axial chord length.
When the casing processing structure 2 inclines along the rotating direction of the movable vane, the matching effect of the casing processing structure 2 and the speed triangle of the top area of the vane is better, the pressure difference between the pressure surface and the suction surface of the movable vane can be more fully utilized, the circulating flow in the casing processing structure 2 is stimulated, and the better stability expanding effect is realized. According to the embodiment of the present disclosure, the angle of the casing handling structure 2 in the radial forward blade rotation direction is configured to be 30 ° to 60 °.
Under the condition that the machining strength is allowed, the number of the case processing structures 2 is increased to be beneficial to obtaining a better stability expanding effect, and according to the embodiment of the disclosure, the number of the case processing structures 2 covered by a single movable blade channel is 4-8, and certainly, the number of the case processing structures 2 can be reasonably set according to the requirement.
According to the embodiment of the invention, the larger the circumferential opening ratio of the casing treatment structure 2 is, the larger the circulation flow in the casing treatment structure 2 is, the better the stability expanding effect is, but the larger the jet flow is, the larger efficiency loss is caused. In order to achieve a low entropy design of the case treatment structure 2, according to embodiments of the present disclosure, the circumferential open area ratio of the case treatment structure 2 is 0.2-0.5.
Fig. 5 schematically shows a schematic design of a forward-tilting casing handling structure 2 according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a design scheme of a casing processing structure 2 according to an embodiment of the present disclosure, and by performing experimental simulation on the forward-inclined casing processing structure 2, a obtained numerical calculation result shows that, on the premise that the peak efficiency is not substantially reduced, the compressor stability margin of the compressor using the forward-inclined casing provided by the embodiment of the present invention is widened by at least 8.5%.
According to an embodiment of the present invention, the interface of the case handling structure 2 and the case body 3 comprises a polygonal shape (e.g. rectangular, etc.) or a polygonal shape.
According to an embodiment of the invention, the compressor comprises a forward tilting casing as described above.
According to embodiments of the present invention, the compressor may be a single stage or multi-stage configuration centrifugal, diagonal flow, or axial flow compressor.
According to the embodiment of the invention, the casing treatment structure 2 arranged on the casing main body 3 is configured into a shape inclined against the main flow direction, so that the outlet direction of the internal circulating flow can be changed, the mixing loss of the main flow and the jet flow can be reduced, and the overall entropy production can be reduced. Meanwhile, the case treatment structures 2 which are uniformly arranged at intervals along the circumferential direction are formed in the case main body 3, the case treatment structures 2 have the tendency of inclining in the reverse main flow direction, the mixing loss of jet flow and main flow in the case treatment structures 2 is reduced, and a large stability margin is obtained while the negative influence on peak efficiency is reduced.
The embodiments of the present invention are described above. These examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the invention, and such alternatives and modifications are intended to fall within the scope of the invention.
Claims (10)
1. A forward tilting casing for compressor stability augmentation, comprising:
the casing body is arranged on the movable blade;
the multiple casing processing structures are arranged on the casing main body and deflect by a first preset angle along the rotation direction of the radial forward moving blade, and the multiple casing processing structures are uniformly distributed in the front edge area of the moving blade along the circumferential direction, wherein the meridian plane projection of the casing processing structures is a forward-inclined structure in the reverse main flow direction.
2. The receiver of claim 1, wherein the forward-tilting feature is a second predetermined angle of deflection of the receiver handling feature in an axial counter-current flow direction.
3. The casing according to claim 1, wherein the meridian profile is a B-spline or bezier curve, and the casing treatment meridian profile intersects the inner wall of the casing body.
4. A casing according to claim 1 or claim 3, wherein the tangential line of the meridian plane at the target intersection point with the inner wall of the casing body is at an angle less than 90 degrees to the axial direction.
5. The receiver according to claim 4, wherein a profile of the meridian plane axially covers a leading edge point of the moving blade, the profile and an inner wall of the receiver body are 20% -40% of a moving blade tip axial chord length from the moving blade leading edge point at a target intersection point, a height of the receiver processing structure is 20% -50% of the moving blade tip axial chord length, and a length of the receiver processing structure is 30% -70% of the moving blade tip axial chord length.
6. The receiver according to claim 1, wherein the first preset angle is 30 ° to 60 °.
7. The casing according to claim 1, wherein the number of casing handling structures in the leading edge region of each of the buckets is 2-10.
8. The casing according to claim 1, wherein the casing handling structure has a circumferential open area ratio of 0.2 to 0.5.
9. The receiver of claim 1, wherein the interface of the receiver handling structure and the receiver body comprises a polygon or a dogleg.
10. A compressor, comprising: the forward tilting receiver according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410415916.7A CN118273977A (en) | 2024-04-08 | 2024-04-08 | Forward tilting type casing for expanding stability of air compressor and air compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410415916.7A CN118273977A (en) | 2024-04-08 | 2024-04-08 | Forward tilting type casing for expanding stability of air compressor and air compressor |
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| Publication Number | Publication Date |
|---|---|
| CN118273977A true CN118273977A (en) | 2024-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410415916.7A Pending CN118273977A (en) | 2024-04-08 | 2024-04-08 | Forward tilting type casing for expanding stability of air compressor and air compressor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10330084A1 (en) * | 2002-08-23 | 2004-03-04 | Mtu Aero Engines Gmbh | Recirculation structure for turbocompressors |
| US20090246007A1 (en) * | 2008-02-28 | 2009-10-01 | Erik Johann | Casing treatment for axial compressors in a hub area |
| CN102162472A (en) * | 2011-05-03 | 2011-08-24 | 北京航空航天大学 | Multi-arc chute processing machine box |
| CN111322272A (en) * | 2020-03-31 | 2020-06-23 | 中国科学院工程热物理研究所 | Front narrow and rear wide type seam type casing processing device for gas compressor |
| CN113915168A (en) * | 2021-11-17 | 2022-01-11 | 西安热工研究院有限公司 | Combined casing treatment structure for axial flow compressor |
| CN114576205A (en) * | 2022-03-14 | 2022-06-03 | 中国航发湖南动力机械研究所 | Efficient self-circulation processing casing with mode conversion |
-
2024
- 2024-04-08 CN CN202410415916.7A patent/CN118273977A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10330084A1 (en) * | 2002-08-23 | 2004-03-04 | Mtu Aero Engines Gmbh | Recirculation structure for turbocompressors |
| US20090246007A1 (en) * | 2008-02-28 | 2009-10-01 | Erik Johann | Casing treatment for axial compressors in a hub area |
| CN102162472A (en) * | 2011-05-03 | 2011-08-24 | 北京航空航天大学 | Multi-arc chute processing machine box |
| CN111322272A (en) * | 2020-03-31 | 2020-06-23 | 中国科学院工程热物理研究所 | Front narrow and rear wide type seam type casing processing device for gas compressor |
| CN113915168A (en) * | 2021-11-17 | 2022-01-11 | 西安热工研究院有限公司 | Combined casing treatment structure for axial flow compressor |
| CN114576205A (en) * | 2022-03-14 | 2022-06-03 | 中国航发湖南动力机械研究所 | Efficient self-circulation processing casing with mode conversion |
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