压缩-膨胀湍流边界层平均摩阻分解  

Decomposition of mean friction drag in compression-expansion turbulent boundary layer

作　　者：段俊亦 童福林 李新亮[1,2] 刘洪伟[1] DUAN Junyi;TONG Fulin;LI Xinliang;LIU Hongwei(State Key Laboratory of High-Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Computational Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]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 [4]中国空气动力研究与发展中心空气动力学国家重点实验室,绵阳621000

出　　处：《航空学报》2022年第1期63-74,共12页Acta Aeronautica et Astronautica Sinica

基　　金：国家重点研发计划(2019YFA0405300,2016YFA0401200);国家自然科学基金(91852203);国家数值风洞工程;科学挑战专题(TZ2016001);中国科学院战略先导专项(XDC01000000,XDA17030100)。

摘　　要：采用直接数值模拟对来流马赫数2.9、24°压缩-膨胀折角构型中激波与湍流边界层干扰问题进行了研究。重点关注膨胀折角法向高度对激波干扰区以及下游平板边界层流动的影响。研究发现,当高度足够大时,激波干扰区内未受下游膨胀波的影响,此时的流动特征与传统的压缩折角干扰构型一致。高度较小时,脱体剪切层的再附过程受到下游膨胀波的加速影响,导致再附点向上游移动,分离泡发生剧烈收缩。对上、下游平板湍流边界层应用了平均摩阻分解技术,比较了湍流边界层在平衡和非平衡状态下的差异。分析发现,膨胀折角区域的高摩阻现象主要与摩阻分解后的C_(f1)项与C_(f3)项相关。高度变化对C_(f1)项影响较小,而对C_(f2)项影响显著。高度变化体现在:下游平板上Görtler涡结构强度以及层流化现象对C_(f2)项贡献的差异。The interaction between the shock wave with Mach number 2.9 and the turbulent boundary layer in the configuration of 24°compression-expansion corners is investigated by using direct numerical simulation.The influence of normal height of the expansion corner on the shock wave interaction region and downstream boundary layer is analyzed.It is found that when the height is large enough,the shock wave interaction region is not affected by the downstream expansion wave,and the characteristics are consistent with those of the traditional compression corner configuration.While the height is small,the reattachment process of the detached shear layer is accelerated by the downstream expansion wave,which causes the reattachment point to move upstream and the separation bubble to shrink dramatically.The decomposition of mean friction drag is applied to the turbulent boundary layer of the upstream and downstream plates,and the difference between the turbulent boundary layer in equilibrium and nonequilibrium state is explored.It is found that the high friction in the expansion corner is mainly related to the C_(f1) term and C_(f3) term in the decomposition of mean friction drag.The height has little effect on the C_(f1) term,while significant effect on the C_(f2) term.Height variation is reflected in the contribution of the Görtler vortex and re-laminar phenomenon on the downstream plate to the C_(f2) term.

关 键 词：激波/湍流边界层干扰 压缩-膨胀折角构型 直接数值模拟 平均摩阻分解 Görtler涡 

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] O241.3[理学—计算数学]