摘要
激波/湍流边界层干扰(STBLI)普遍发生在超声速和高超声速内外流动中,激波诱导流动分离的低频非定常性,表现为激波低频运动以及分离泡的膨胀/收缩,导致其产生的物理机制一直存在一定的争议,受到持续广泛的关注和研究。这种低频非定常性的驱动机制一般可分为3类:①认为这种低频非定常性的来源是上游边界层;②认为是受下游分离流动固有特征所主导;③近期的研究有将2种机制调和在一起的趋势,认为上游/下游机制都存在于激波/边界层低频非定常性中,各自作用的权重受分离程度的影响。若将激波与边界层耦合作为一个动力学系统来考察,该系统可以用一阶低通滤波器来描述,无论干扰来自上游还是下游,其选择性地对特定频率以下的脉动进行响应。本文分别对3种物理机制进行了评述,并且基于已有的研究结果和作者的认知,展望了需要重点关注的研究方向。
Shock wave/Turbulent Boundary Layer Interaction(STBLI)is ubiquitous in internal and external of supersonic and hypersonic flow.The physical mechanism of low-frequency unsteadiness,which is found in shock-induced separation and appears as low-frequency shock motion accompanied with the expansion and contraction of the separation bubble,has been disputed.This research field has been widely concerned and studied.The driving mechanism of low-frequency unsteadiness could be generally divided into three categories.Some researchers believed that the source of the low-frequency unsteadiness originated in the upstream boundary layer.On the contrary some scholars held the opinion that the low-frequency dynamics was dominated by intrinsic nature of downstream separation flow.However,some recent researches trended to reconcile these two opposite views,believing that the upstream and downstream mechanisms co-existed with a weighting function depending on the state of the STBLI.The coupling between shock wave and boundary layer was assumed as a dynamics system,which could be represented as a first-order low-pass filter.This system responded selectively to the perturbations below certain frequency regardless of whether they came from upstream or downstream.The above three physical mechanisms are reviewed respectively.In addition,some research areas which need further attentions are present based on the existing results and the authors'knowledge.
作者
范孝华
唐志共
王刚
杨彦广
FAN Xiaohua;TANG Zhigong;WANG Gang;YANG Yanguang(Hypervelocity Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2022年第1期1-21,共21页
Acta Aeronautica et Astronautica Sinica
基金
国家重点研发计划(2019YFA0405300)。
关键词
激波
湍流边界层
干扰
流动分离
低频非定常性
shock wave
turbulent boundary layer
interaction
flow separation
low-frequency unsteadiness
