高空发动机逆向喷流诱导的非定常流动DSMC仿真  

Unsteady Flow Driven by the Counter-Flow Jets of High-Altitude Engine Based on DSMC Simulation

作　　者：吴俊林[1,2] 李中华[1,2] 彭傲平[1,2] 李埌全 梁杰[1,2] WU Jun-lin;LI Zhong-hua;PENG Ao-ping;LI Lang-quan;LIANG Jie(Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;Laboratory of Aerodynamics in Multiple Flow Regimes,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]中国空气动力研究与发展中心超高速空气动力研究所,四川绵阳621000 [2]中国空气动力研究与发展中心跨流域空气动力学重点实验室,四川绵阳621000

出　　处：《气体物理》2023年第5期38-45,共8页Physics of Gases

基　　金：国家自然科学基金(11902339)。

摘　　要：逆向发动机常用于对飞行器进行减速或分离。为研究高空稀薄条件下逆向发动机喷流和自由来流的相互作用,构建了由两个逆向喷流和高超声速自由来流相互干扰形成的稀薄流场。通过直接模拟Monte Carlo(direct simulation Monte Carlo,DSMC)仿真发现在稀薄来流条件下会形成大面积相互干扰区,且该干扰区存在严重非定常流动现象。初步分析认为,该干扰区的范围和非定常演化过程与自由来流动能和逆向发动机喷流流量紧密相关。Counter-flow engines are often used for aircraft slowing or separating.In order to study the interaction between the counter-flow jets and free stream at high altitudes,the rarefied flow driven by two counter-flow jets and hypersonic free stream was constructed.By the direct simulation Monte Carlo(DSMC)method,it is found that a large area of mutual interference will be formed under the condition of rarefied free stream,and there are serious unsteady flow phenomena in the interference area.According to preliminary analysis,the range and unsteady evolution of the interference area are closely related to the kinetic energy of free stream and the flow rate of counter-flow jets.

关 键 词：稀薄非定常现象 逆向喷流 高空 直接模拟Monte Carlo方法 大范围干扰区 

分 类 号：O355[理学—流体力学] O356[理学—力学]