高焓压缩膨胀角湍流与化学反应干扰研究  

Study on the turbulence and chemistry interaction on high enthalpy compression-expansion corner

作　　者：刘晓东 刘朋欣 李辰 孙东[1] 袁先旭[1] Liu Xiaodong;Liu Pengxin;Li Chen;Sun Dong;Yuan Xianxu(Computational Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;Xichang Satellite Launch Center,Xichang 615000,China)

机构地区：[1]中国空气动力研究与发展中心计算空气动力研究所,绵阳621000 [2]西昌卫星发射中心,西昌615000

出　　处：《空天技术》2024年第2期79-88,共10页Aerospace Technology

摘　　要：高超声速飞行器近年来受到广泛关注,随着飞行器飞行马赫数不断提高,头激波后的高温能够促使空气发生离解,进而形成强激波、湍流脉动以及非平衡化学反应三者之间的复杂干扰。通过对高超声速楔形体头部斜激波后的高焓激波/湍流边界层干扰进行直接数值模拟,研究了在强干扰作用下边界层内的平均组分分布、湍流脉动和组分脉动分布,并且通过湍流-反应干扰系数获得了在强激波作用下湍流与化学反应的干扰强度分布。研究结果表明:高焓流动出现较小分离,在分离区平均温度和密度都出现升高,气体离解加剧,O、N组分平均质量分数较来流边界层明显增大;激波干扰中的可压缩性主要集中在分离激波以及分离泡上方的剪切层中;干扰区内O、N组分质量分数脉动强度明显增强,但与湍动能分布略有不同;湍流反应干扰最强的区域与湍动能极大值区域高度重合,而与组分平均及脉动的极大值位置相差较大。In recent years,hypersonic vehicles have attracted extensive attention,with the Mach number of the aircraft increasing,the gas may dissociate in the high-temperature environment after the leading shock,and then form the complex interaction among strong shock waves,turbulent pulsation and non-equilibrium chemical reactions.This work chose the flow condition after the leading shock of a cone in hypersonic flight,and performed direct numerical simulation of high enthalpy shock wave/turbulent boundary layer interaction.The mean component distribution,turbulent pulsation and component pulsation distribution in boundary layer under the strong interaction are studied,and the distribution of turbulence and chemical reaction interaction intensity under strong shock wave is obtained by turbulence-chemistry interaction coefficient.The results show that the high enthalpy flow has a small separation,the average temperature and density in the separation zone increase,the gas dissociation is intensified,and the average mass fraction of O and N components increases significantly compared with the incoming boundary layer.The mass fraction pulsation of O and N components in the interaction area is obviously enhanced,but it is slightly different from the distribution of turbulent kinetic energy.The region with the strongest Turbulence-Reaction Interaction is highly coincident with the region of turbulent kinetic energy maximum,while it is quite different from the region of maximum component average and pulsation.

关 键 词：高超声速 激波/湍流边界层干扰 湍流-反应干扰 非平衡化学反应 直接数值模拟 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程] O357.42[理学—流体力学]