圆截面超声速燃烧室乙烯燃料喷注火焰结构和模式分析  

Analysis of structure and regime of ethylene fuel injection flame in circular-section supersonic combustor

作　　者：汤涛 于江飞 黄玉辉 汪洪波[1] 孙明波[1] 赵国焱[1] 熊大鹏 王振国[1] TANG Tao;YU Jiangfei;HUANG Yuhui;WANG Hongbo;SUN Mingbo;ZHAO Guoyan;XIONG Dapeng;WANG Zhenguo(College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China;Equipment Project Management Center,Equipment Development Department,Beijing 100083,China)

机构地区：[1]国防科技大学空天科学学院,长沙410073 [2]装备发展部项目管理中心,北京100083

出　　处：《航空学报》2024年第11期133-145,共13页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(11925207,12002381,92252206)。

摘　　要：采用耦合了火焰面/进度变量模型的混合RANS/LES方法对高马赫数下的乙烯燃料圆截面超燃冲压发动机燃烧流场开展了数值研究,计算结果显示出与试验高度一致的燃烧结构和释热特征。在此基础上,分析结果表明:流场的混合过程由大尺度流动结构主导,流道中心的激波系是促进涡量产生、燃料掺混以及下游反应区褶皱的直接原因。凹腔在此构型和工况中没有直接参与释热,而是起到了诱导激波产生从而促进混合和燃烧的作用。整体上,燃烧呈现时空多尺度特征,火焰在向下游传播的过程中逐渐向近平衡状态发展。超燃模态和扩散燃烧主导了整个反应区,并且大部分快反应区燃烧处于波纹板式火焰面模式。In this study,a hybrid Reynolds-Averaged Navier-Stokes/Large Eddy Simulation(RANS/LES)approach coupled with an improved Flamelet/Progress Variable model is used to numerically investigate the combustion flow field of an ethylene-fueled circular-section model scramjet at high Mach numbers.The computational results show highly consistent combustion structure and heat release characteristics with those from the experiments.On this basis,the analysis results indicate that the mixing process of the flow field is dominated by the large-scale flow structures,and the shock train at the center of the channel is the direct cause of promoting vorticity generation,fuel mixing,and downstream reaction zone wrinkling.In this case,the cavity does not directly participate in the heat release process,but rather plays a role in inducing shock waves and promoting mixing and combustion.Overall,combustion exhibits spatiotemporal multi-scale characteristics,and flames gradually develop towards a near equilibrium state as they propagate downstream.The scramjet mode and diffusion combustion dominate the entire reaction zone,and most of the fast-chemistry combustion is in the corrugated flamelets regime.

关 键 词：超燃冲压发动机 混合RANS/LES 火焰面模型 超声速 燃烧模式 

分 类 号：V235[航空宇航科学与技术—航空宇航推进理论与工程]