IDDES-SPOM方法高精度预测空天飞行器激波边界层干扰非定常局部分离流动  

Numerical studies on the unsteady local separation flow caused by the shock wave and boundary layer interaction of spacecrafts by IDDES-SPOM method

作　　者：杨益江 郭晓伟 肖志祥[1] Yang Yijiang;Guo Xiaowei;Xiao Zhixiang(School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《空天技术》2023年第2期35-47,74,共14页Aerospace Technology

基　　金：国家重点研发计划(2019YFA0405300);国家自然科学基金(91952302);国家重大项目(GJXM92579)。

摘　　要：空天飞行器在执行飞行任务时,飞行马赫数范围较大,常处于超声速或高超声速状态,会面临激波/边界层干扰(SWBLI)等引起的复杂气动力、热等难题,其局部分离存在强压力脉动、高热流冲击等极端动载荷。针对空天飞行器沿程复杂SWBLI干扰引起的非定常局部分离流动,结合RANS高效率模拟近壁流动和LES高精度解析分离的RANS-LES混合方法是极具工程应用潜力的方法。然而,原始RANS-LES混合方法在预测大面积附体而局部分离的SWBLI流动时误差极大,需要在局部分离上游引入小扰动生成湍流结构,方能改善预测效果。以DES类IDDES方法为基础,在其SWBLI上游引入合成粒子组以获得湍流边界层,并应用IDDES-SPOM方法高精度数值仿真了空天飞行器典型部位SWBLI的非定常局部分离流动,包括压缩拐角、三维内流道和多面体等。揭示了激波振荡、局部压力脉动等非定常流动的产生和相互作用机制。该方法可预测空天飞行器典型部位的三维复杂非定常分离流动,预示其动载荷环境,为空天飞行器的结构设计提供理论支撑与分析手段。The flight speed of the spacecraft is generally supersonic and hypersonic.The shock wave and boundary layer interaction(SWBLI)occur frequently.Complex aerodynamic phenomena caused by SWBLI often leads to extreme dynamic aero-loads, such as the strong pressure and heat pulsation in local regions. Toaccurately simulate complex unsteady and local separated flows of the spacecraft with most of attachedboundary layer, the advanced RANS-LES methods need to be developed by importing synthetic turbulence.The synthetic particle group method (SPOM) with IDDES is introduced to resolve small-scale turbulentstructures in the local separation. Then, IDDES-SPOM is applied to simulate the SWBLI flows at some typicallocations of the spacecraft, including the compression ramp, inner flow channel and polyhedron. From theresults, some complex separation flow phenomena are explored, such as the shock oscillation and breathing ofseparation bubble. It's the main factor which leads to the increase of pressure pulsation rapidly. Therefore, theIDDES-SPOM method can accurately predict complex flows induced by SWBLI and it can provide thetheoretical basis and analytical tools for the spacecraft design.

关 键 词：空天飞行器 激波/边界层干扰 RANS-LES混合方法 合成粒子组方法 压力脉动 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]