对称交叉激波和湍流边界层相互作用的数值研究

Numerical investigation of interaction between symmetric crossing shock waves/turbulence boundary layer

关键词:  进气道  计算流体力学  激波  边界层  湍流模型

Key words:  Inlet  Computational fluid dynamics  Shock wave  Boundary layer  Turbulence model

摘要:

针对两种双尖鳍外形的对称交叉激波与湍流边界层相互作用,采用N-S方程和两种湍流模型进行了计算。研究了网格收敛性、鳍的角度和湍流模型对壁面压强、Stanton数和壁面摩擦力线的影响。弱相互作用的计算结果较好,强相互作用的壁面压强和摩擦力线的计算结果与试验吻合较好,而Stanton数的计算结果较差,峰值高达试验的2.5倍左右。随着鳍的角度的增加,壁面压强和Stanton数的分布从单调分布发展为M型分布,两者的峰值不在相同的位置。湍流模型对壁面压强和壁面摩擦力线影响很小,对Stanton数计算的影响很大,SST模型比BSL模型表现好一些。

Abstract:

The flow field of interaction between crossing shock waves and turbulence boundary layer caused by two kinds of double sharp fins is computed with Navier-Stokes equations and two turbulence models.The main focus is the effect of grid convergence,angle of sharp fins and turbulence model on wall pressure,Stanton number and skin friction lines.As compared with the experiment,the result of weak interaction is good.The computed surface pressure and skin friction lines of strong interaction are good,but the Stanton number is poor because its peak is two and half times of experimental data.With increasing angle of sharp fins,the distributions of wall pressure and Stanton number are changed from monotonic distribution to M-type distribution.The position of peak wall pressure is different from that of peak Stanton number.Turbulence model has little effect on wall pressure and skin friction lines,while it has much effect on Stanton number.SST turbulence model is better than BSL turbulence model in this case.