跨声速流动激波边界层干扰分离流动特征研究  

Characteristics of Transonic Flow Separation Due to Shock-Boundary Layer Interaction

作　　者：张斯澄 吕本帅 刘振皓 李海波 ZHANG Si-cheng;LYU Ben-shuai;LIU Zhenhao;LI Hai-bo(Department of Aeronautics and Astronautics,College of Engineering,Peking University,Beijing,100871,China;Science and Technology On Reliability and Environment Engineering Laboratory,Beijing Institute of Structure and Environmental Engineering,Beijing,100076,China;不详)

机构地区：[1]北京大学工学院航空航天工程系,北京1000871 [2]北京强度与环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2023年第1期31-37,共7页Structure & Environment Engineering

基　　金：基础研究项目。

摘　　要：基于改进延迟脱落涡(IDDES)方法,针对对跨声速流动范围内的球头锥形火箭整流罩绕流流场进行了大涡模拟/雷诺平均(LES/RANS)混和模拟。通过与国内外文献中的实验和数值模拟结果进行对比,验证了IDDES模拟能够充分捕捉到跨声速流动中激波边界层相互干扰导致的分离流动特征。模拟结果显示整流罩表面时均压力分布与试验吻合一致,脉动压力峰值位置能够准确预测。通过对分离泡区域内的速度场进行谱特征正交分解(SPOD),得到流场中的主要含能结构,以及流动结构的频谱与模态特征。结果表明激波分离泡区域主要振荡能量集中在前四阶SPOD模态,其中一阶主模态表现出明显的呼吸特征,为发展表面压力脉动的控制技术提供了新的思路。Transonic flow around a spherically blunted rocket fairing is studied using a hybrid LES/RANS approach based on the Improved Delayed Detached Eddy Simulation(IDDES). Comparison with experimental and numerical data in the literature shows that the shock wave, its interaction with the boundary layer, and the resulting boundary layer separation can be captured well by the simulation. The mean pressure coefficient distribution along the fairing surface agrees very well with experimental results, whereas the location of the peak pressure fluctuations accords with the PSP measurements in experiments. Spectral Proper Orthogonal Decomposition(SPOD) is used to decompose the velocity field around the separation bubble to examine both its spectral and mode characteristics. It is shown that the velocity field is dominated by the first several SPOD modes, the first of which exhibits a clear breathing feature. The control of this dominant mode has important implications in developing new technologies for suppressing the surface pressure fluctuations around a rocket fairing at transonic speeds.

关 键 词：跨声速 激波 边界层 脉动压力 

分 类 号：V416[航空宇航科学与技术—航空宇航推进理论与工程] TM15[电气工程—电工理论与新技术] U665[交通运输工程—船舶及航道工程]