快背式MIRA模型射流主动控制气动减阻研究

Active Flow Control of Fast-back MIRA Model to Reduce Aerodynamic Drag with Steady Jet

利用CFD仿真软件STAR-CCM+,对类车体MIRA模型的尾流场进行仿真研究。采用主动控制减阻技术的流动控制方式,应用定常射流的方式控制尾流场的流动结构,探讨射流减阻的减阻措施。使用雷诺时均法SST k-w湍流模型对快背式MIRA模型尾部流场进行数值仿真,对尾部各个可能减阻的位置做了研究,找到最好的减阻工况,并分析了尾部涡流的变化,发现通过控制模型尾部的分离涡,可以改变车体的压力大小,从而减小模型的压差阻力,实现减阻的目的。

In this paper,the CFD simulation software STAR-CCM+is used to simulate the wake field of the MIRA model.The flow mode of the tail flow field was controlled by the active control drag reduction technique with steady jet.The method of jet reduction and the SST k-w turbulence model were adopted to simulate the tail flow field of the fast-back MIRA model.The position of the tail was studied.The best reduction case was obtained and the variation of the tail vortex was anlyzed.It is found that the pressure of the model can be changed by controlling the separation vortex of the tail of the model in order to reduce the pressure resistance of the model and realize the purpose of drag reduction.