动态微涡流发生器对激波/边界层干扰的影响研究

Effects of Dynamic Micro Vortex Generator on Shock Wave Boundary Layer Interactions

关键词:  涡流发生器  激波  边界层干扰  动态网格技术  湍流  离散涡

Key words:  Vortex generator  Shock wave  Boundary layer interaction  Dynamic mesh  Turbulence  Discrete vortex

摘要:

为了探索动态微涡流发生器（MVG）的性能，基于OPENFOAM数值仿真平台，采用动态网格技术和湍流离散涡（DES）模型，研究了MVG以一定速度向下游移动时，激波/边界层干扰（SWBLI）流场特性的变化，重点关注干扰区域内的流向和展向的流场特性。来流马赫数为4，MVG向下游移动速度为0，20和40m/s。研究表明：当MVG向下游移动时，SWBLI区域的“弓”形高压区会演化成“双弓”形；入射激波形成高压区的压力明显降低，同时，入射激波和反射激波形成高压区的峰值位置均会向下游移动；流场下游“双圆弧”状高压区的高度逐渐降低；SWBLI区域边界层的高度逐渐降低，同时边界层底部的速度也有所降低；随着MVG移动速度的增加，对SWBLI流场的控制效果更加明显；动态MVG对流场的控制是通过尾迹涡和波系结构实现的。

Abstract:

In order to explore the performance of the dynamic micro vortex generator， based on the OPENFOAM numerical simulation platform， the dynamic mesh technology and detached-eddy simulation （DES） are used to study the flow field characteristics of shock wave boundary layer interactions （SWBLI） when the micro vortex generator （MVG） moves downstream at a certain speed. The flow field characteristics of the flow direction and the spread direction in the interactions area are focused on. The inlet Mach number is 4， and the speed of the MVG moving downstream is 0， 20 and 40m/s. The results show that when MVG moves downstream， the ‘bow’ high-pressure area in the SWBLI region will evolve into a ‘double bow’ shape； the pressure of the high-pressure region formed by the incident shock wave is significantly reduced. At the same time， the peak positions of the high pressure region formed by the incident shock wave and the reflected shock wave will move downstream. In the downstream of the flow field， the height of the ‘double arc’ high pressure region decreases gradually. The height of the boundary layer in SWBLI region decreases gradually， and the velocity at the bottom of the boundary layer also decreases. With the increase of MVG moving speed， the control effect on the SWBLI becomes more obvious. The wake vortex and wave system structure are the decisive factors for dynamic MVG to control the flow field.