Abstract
A rotating detonation propagating at nearly Chapman–Jouguet velocity is numerically stabilized on a two-dimensional simple chemistry flow model. Under purely axial injection of a combustible mixture from the head end of a toroidal section of coaxial cylinders, the rotating detonation is proven to give no average angular momentum at any cross section, giving an axial flow. The detonation wavelet connected with an oblique shock wave ensuing to the downstream has a feature of unconfined detonation, causing a deficit in its propagation velocity. Due to Kelvin–Helmholtz instability existing on the interface of an injected combustible, unburnt gas pockets are formed to enter the junction between the detonation and oblique shock waves, generating strong explosions propagating to both directions. Calculated specific impulse is as high as 4,700 s.
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Communicated by F. Zhang.
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Hishida, M., Fujiwara, T. & Wolanski, P. Fundamentals of rotating detonations. Shock Waves 19, 1–10 (2009). https://doi.org/10.1007/s00193-008-0178-2
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DOI: https://doi.org/10.1007/s00193-008-0178-2
Keywords
- Rotating detonation
- Unconfined detonation
- Detonation wavelet
- Kelvin–Helmholtz instability
- Unburnt pocket
- Standing detonation