非对称交叉激波和湍流边界层相互作用的数值研究

针对7°×11°双尖鳍外形的非对称交叉激波与湍流边界层相互作用,采用Navier-Stokes方程和5种湍流模型进行了计算.主要考察对壁面压强、热传导、绝热壁面温度和壁面摩擦力线分布的计算精度.计算结果表明:两道斜激波相交后的区域的壁面压强和热传导都比较高;计算的压强和壁面摩擦力线与试验吻合很好,绝热壁面温度次之,热传导最差,峰值高达试验的3倍左右.湍流模型对壁面压强和壁面摩擦力线影响很小,对绝热壁面温度和热传导影响很大.在5种湍流模型中,TNT(turbulent/non-turbulent)和SST(shear-stress transport)模型表现较好. 

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

The flow field of crossing shock waves/turbulence boundary layer caused by 7o×11o double sharp fins is computed with Navier-Stokes equations and five turbulence models. The main focus is the resolution of wall pressure, heat transfer, adiabatic wall temperature and skin friction lines. The results demonstrate: the region after the intersection of two oblique shock waves has high pressure and heat transfer. As compared with the experiment, the computed surface pressure and skin friction lines are very good, the adiabatic wall temperature is moderate, and the heat transfer is poor because its peak is about three times of experiment counterpart. Turbulence model has little effect on wall pressure and skin friction lines, whereas has big effect on adiabatic wall temperature and heat transfer. TNT and SST models behave relatively well among these five turbulence models.