激波与三维正弦扰动火焰相互作用的数值模拟研究  

Numerical Study of the Interaction Between Shock Wave and Three-dimensional Sinusoidally Perturbed Flame

作　　者：沈婷 肖华华[1,2] SHEN Ting;XIAO Huahua(State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230027,China;Dalian National Laboratory for Clean Energy,Dalian 116023,China)

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230027 [2]中国科学院洁净能源创新研究院,大连116023

出　　处：《工程热物理学报》2022年第9期2525-2530,共6页Journal of Engineering Thermophysics

基　　金：国家重点研发计划资助(No.2021YFB4000902);中央高校基本科研业务费专项资金(No.WK2320000048);中国科学院洁净能源创新研究院合作基金资助项目(No.DNL202006);国家自然科学基金(No.51976210);国家创新人才计划青年项目。

摘　　要：采用高精度算法和动态自适应网格技术求解了三维全可压反应性Navier-Stokes方程。通过数值模拟,展示了三维正弦扰动火焰在受激波冲击后,由于Richtmyer-Meshkov不稳定性演化成“尖钉-气泡”结构,并进一步产生二次不稳定性形成“蘑菇盖”结构。本文探讨了入射激波强度、火焰初始扰动振幅及波长对激波-火焰相互作用的影响,结果表明:激波冲击火焰面导致的扰动增长随火焰面初始扰动振幅的增加而增加,而对激波强度和火焰初始扰动振幅的依赖性较弱;火焰面的热释放速率随激波强度和火焰初始扰动振幅的增加而增加,而与初始扰动波长的相关性较弱。The interaction of three-dimensional(3D) sinusoidally perturbed flame with shock wave was studied by solving 3D reactive Navier-Stokes equations, coupled with a simplified chemicaldiffusive model. The simulations show that the flame front evolves into a flame front with “spikebubble” structure because of Richtmyer-Meshkov(RM) instability induced by flame-shock interaction, and further produces a secondary instability(“mushroom cap”). The influence of incident shock wave strength, the initial amplitude and wavelength of perturbation on the flame-shock interaction was discussed. The results indicate that the perturbation induced by RM instability increases as the initial amplitude increases, and weakly depends on the shock strength or the wavelength of flame. The energy release rate after flame-shock interaction increases as the shock wave strength or amplitude increases, and is weakly correlated with wavelength.

关 键 词：激波–火焰相互作用 RICHTMYER-MESHKOV不稳定性 马赫数 扰动振幅 扰动波长 数值模拟 

分 类 号：TF051[冶金工程—冶金物理化学]