Numerical simulations of cellular detonation diffraction in a stable gaseous mixture

作     者：Jian Li Jianguo Ning Charles B.Kiyanda Hoi Dick Ng 

作者机构：State Key Laboratory of Explosion Science&TechnologyBeijing Institute of TechnologyBeijing 100081China Department of Mechanical and Industrial EngineeringConcordia UniversityMontréalQCH3G 1M8Canada 

出 版 物：《Propulsion and Power Research》 (推进与动力（英文）)

年 卷 期：2016年第5卷第3期

页      面：177-183页

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：This work is supported by the Natural Sciences and Engineering Research Council of Canada(NSERC)(No.341889) National Natural Science Foundation of China(Nos.11390363,11325209) 

主　　题：Detonations Diffraction Pulse detonation engine Stable mixture Adaptive mesh refinement(AMR) 

摘      要：In this paper,the diffraction phenomenon of gaseous cellular detonations emerging from a confined tube into a sudden open space is simulated using the reactive Euler equations with a two-step Arrhenius chemistry *** two-dimensional and axisymmetric configurations are used for modeling cylindrical and spherical expansions,*** chemical parameters are chosen for a stable gaseous explosive mixture in which the cellular detonation structure is highly *** mesh refinement(AMR)is used to resolve the detonation wave structure and its evolution during the *** numerical results show that the critical channel width and critical diameter over the detonation cell size are about 1371 and 2571,*** numerical findings are comparable with the experimental observation and confirm again that the critical channel width and critical diameter differ essentially by a factor close to 2,equal to the geometrical scaling based on front curvature *** unstable mixtures where instabilities manifested in the detonation front structure play a significant role during the transmission,the present numerical results and the observed geometrical scaling provide again evidence that the failure of detonation diffraction in stable mixtures with a regular detonation cellular pattern is dominantly caused by the global curvature due to the wave divergence resulting in the global decoupling of the reaction zone with the expanding shock front.