点火源参数对旋转爆轰波特征影响的数值模拟  

A Numerical Study on the Effect of Ignition Pattern on Wavelet Features in Rotating Detonation Waves

作　　者：彭澳 张静雯[1] 陈先锋[1] 孙绪绪 PENG Ao;ZHANG Jingwen;CHEN Xianfeng;SUN Xuxu(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉理工大学安全科学与应急管理学院,湖北武汉430081

出　　处：《高压物理学报》2022年第6期33-43,共11页Chinese Journal of High Pressure Physics

基　　金：National Key R&D Program of China(2021YFB4000901);Fundamental Research Funds for the Central Universities(223161001);Opening Fund of the Key Laboratory of Civil Aviation Thermal Disaster Prevention and Emergency of Civil Aviation University of China(RZH2021-KF-05);Opening Fund of the State Key Laboratory of Fire Science of University of Science and Technology of China(HZ2022-KF-09)。

摘　　要：采用欧拉方程和两步诱导反应模型,详细研究了点火源参数对旋转爆轰波特征的影响规律,详细考虑了点火源尺寸、数量和间距的影响。利用提前计算得到的C-J爆轰波作为点火源,改变C-J爆轰波的大小便可得到不同尺寸的点火源。数值模拟结果表明:旋转爆轰波特征与点火源参数密切相关;仅可观察到双波和三波模式;旋转爆轰波数量与点火源尺寸之间呈现非线性关系。对于一个点火源,在相同的点火源宽度下,双波模式出现的概率超过80%,而三波模式的出现是一个随机现象。旋转爆轰波的形成机理可总结如下:第一个旋转爆轰波来源于入射C-J爆轰波的直接起爆,后续的旋转爆轰波则起源于压缩波与可燃气体射流之间的相互作用。旋转爆轰波特征与点火源数量及间距密切相关,它们之间的关系也都呈现非线性。In this study,the effect of ignition pattern on the wavelet features of rotating detonation waves(RDWs)is numerically investigated with Euler equations and two-step induction-reaction model.The influences of the size,the number and the spacing of the ignition zone were considered.The theoretical Chapman-Jouguet(C-J)detonation wave was used as the ignition zone,and different ignition patterns were obtained by changing the size of the C-J detonation wave.The numerical results indicate that the wavelet features of rotating detonation waves closely depend on the ignition zone size.Only the two-wave and the three-wave modes are observed for the single ignition zone with various sizes,and the relation between the quantity of RDWs and the ignition size is non-linear.For the single ignition zone with the same width,the occurrence probability of the two-wave mode is approximately greater than 80%,while the three-wave mode is a completely random phenomenon.The formation mechanisms of the multiple-wave modes can be summarized as follows:(1)the first RDW is directly produced from the initial C-J detonation wave near the top of the combustor;(2)the subsequent RDW is induced by the interaction between the compressed wave produced by the initial C-J detonation and the jet flow from the micro-nozzles.The quantity of RDWs increases with the quantity or the spacing of ignition zone,but their relations are both non-linear.

关 键 词：点火源 旋转爆轰波 波特征 压缩波 射流 

分 类 号：O382[理学—流体力学]