Nonlinear analysis of combustion oscillations in a cavity-based supersonic combustor  

作　　者：WANG HongBo WANG ZhenGuo SUN MingBo WU HaiYan 

机构地区：[1]Science and Technology on Scramjet Laboratory,National University of Defense Technology

出　　处：《Science China(Technological Sciences)》2013年第5期1093-1101,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.50906098,91016028);Fok Ying Tung Education Foundation(Grant No.131055)

摘　　要：Combustion oscillations in a supersonic combustor with hydrogen injection upstream of a cavity flameholder are investigated using nonlinear analysis based on experimental measurements.Time series of both flamefront and wall pressure are acquired,and the state space reconstruction approach is adopted to characterize the nonlinear behavior of the combustion oscillations.Three overall equivalence ratios,0.038,0.076 and 0.11,are considered.The existence of a chaotic source in the present combustion system is demonstrated.The correlation dimension and the largest Lyapunov exponent tend to become larger with the increasing equivalence ratio,indicating a more complicated and unstable combustion system.In particular,it is found that the correlation dimension for the highest equivalence ratio is much greater than those of the two lower equivalence ratios.Two possible reasons responsible for the observed nonlinear behaviors are identified.One is the shock-related instabilities and the other is the transition of combustion stabilization mode between the cavity and jet-wake stabilized mode.

关 键 词：CAVITY SUPERSONIC COMBUSTION OSCILLATION NONLINEAR 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]