Numerical Study on Critical Wedge Angle of Cellular Detonation Reflections
WANG Gang1,2, ZHANG De-Liang2, LIU Kai-Xin1,3
1LTCS and College of Engineering, Peking University, Beijing 1008712LHD, Institute of Mechanics, Chinese Academy of Sciences, Beijing 1001903Center for Applied Physics and Technology, Peking University, Beijing 100871
Numerical Study on Critical Wedge Angle of Cellular Detonation Reflections
WANG Gang1,2, ZHANG De-Liang2, LIU Kai-Xin1,3
1LTCS and College of Engineering, Peking University, Beijing 1008712LHD, Institute of Mechanics, Chinese Academy of Sciences, Beijing 1001903Center for Applied Physics and Technology, Peking University, Beijing 100871
摘要The critical wedge angle (CWA) for the transition from regular reflection (RR) to Mach reflection (MR) of a cellular detonation wave is studied numerically by an improved space-time conservation element and solution element method together with a two-step chemical reaction model. The accuracy of that numerical way is verified by simulating cellular detonation reflections at a 19.3° wedge. The planar and cellular detonation reflections over 45°-55° wedges are also simulated. When the cellular detonation wave is over a 50° wedge, numerical results show a new phenomenon that RR and MR occur alternately. The transition process between RR and MR is investigated with the local pressure contours. Numerical analysis shows that the cellular structure is the essential reason for the new phenomenon and the CWA of detonation reflection is not a certain angle but an angle range.
Abstract：The critical wedge angle (CWA) for the transition from regular reflection (RR) to Mach reflection (MR) of a cellular detonation wave is studied numerically by an improved space-time conservation element and solution element method together with a two-step chemical reaction model. The accuracy of that numerical way is verified by simulating cellular detonation reflections at a 19.3° wedge. The planar and cellular detonation reflections over 45°-55° wedges are also simulated. When the cellular detonation wave is over a 50° wedge, numerical results show a new phenomenon that RR and MR occur alternately. The transition process between RR and MR is investigated with the local pressure contours. Numerical analysis shows that the cellular structure is the essential reason for the new phenomenon and the CWA of detonation reflection is not a certain angle but an angle range.
WANG Gang;ZHANG De-Liang;LIU Kai-Xin;. Numerical Study on Critical Wedge Angle of Cellular Detonation Reflections[J]. 中国物理快报, 2010, 27(2): 24701-024701.
WANG Gang, ZHANG De-Liang, LIU Kai-Xin,. Numerical Study on Critical Wedge Angle of Cellular Detonation Reflections. Chin. Phys. Lett., 2010, 27(2): 24701-024701.
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2010, Vol. 27 
