摘要
针对斜激波入射流向涡对形成的复杂流动干扰现象,在来流马赫数6条件下,利用双支架支撑的后掠斜坡式涡流发生器生成流向涡对,采用数值模拟结合激波风洞实验,研究了斜激波与流向涡对相互作用引起的激波变形和旋涡演变。结果表明,斜激波与流向涡对相互作用的剧烈程度大致分为强、中、弱三种。在强相互作用下,激波面向上游凸起的程度最剧烈,呈现类“T”字型特征,其对称面处接近于一道正激波,波后出现回流区和局部流动滞止,使得流向涡对发生破碎;在中等相互作用下,对称面处存在局部正激波,但没有出现回流区;在弱相互作用下,不再出现局部正激波。进一步地分析发现,斜激波与流向涡对相互作用产生的流向涡对破碎现象,不符合经典的激波作用下单个流向涡破碎理论的预测。采用流向涡对对称面处的气流参数,对经典的流向涡破碎理论进行修正后,能够预测本文流向涡对在斜激波作用下是否发生破碎。
The shock deformation and vortex evolution induced by oblique shock wave/streamwise-vortexpair interaction were investigated to better understand the flow physics of this complex phenomenon.Numerical simulations and shock tunnel experiments were conducted at a freestream Mach number of 6 using a swept-ramp vortex generator supported by two trestles to produce the streamwise-vortex-pair.The results show that the intensity of the oblique shock wave/streamwise-vortex-pair interaction can be classified into strong,moderate,and weak types.The strong interaction is characterized by a highly bulged-forward shock front that looks like a Tshaped structure in a three-dimensional view.The bulged-forward shock approximates a normal shock wave in the symmetry plane.Downstream of the bulged-forward shock,subsonic reverse-flow and a saddle point of flow stagnation are formed,which indicates the breakdown of the streamwise-vortex-pair.For the moderate interaction,reverse flow is not observed,although a localized normal shock wave is presented in the symmetry plane.Neither a localized normal shock wave nor reverse flow are shown in the weak interaction.It is demonstrated that the streamwise-vortex-pair breakdown induced by an oblique shock wave cannot be predicted by the classic theo‐ries for predicting the onset of a streamwise vortex breakdown.Thus,a modified theory is proposed by using the flow parameters in the symmetry plane,which shows a good agreement with the present oblique shock wave/streamwise-vortex-pair interactions.This study provides an important model for understanding the mechanisms of streamwise-vortex-pair breakdown induced by an oblique shock wave.
作者
马印锴
李祝飞
杨基明
MA Yin-kai;LI Zhu-fei;YANG Ji-ming(Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2022年第1期82-93,共12页
Journal of Propulsion Technology
基金
国家自然科学基金(11772325,11621202)。
关键词
斜激波
涡流发生器
流向涡对
涡破碎
激波风洞
Oblique shock wave
Vortex generator
Streamwise vortex pair
Vortex breakdown
Shock tunnel
