高超声速化学非平衡流动MHD效应的数值模拟

对偶极子磁场作用下的三维钝头体高超声速黏性绕流的化学非平衡流动进行了数值模拟.计算结果表明,在偶极子磁场强度为1.353 T时,与无磁场作用时相比,激波的脱体距离增加,增幅约为50%;壁面压力系数下降,局部下降最大达37%;壁面摩擦系数减小,局部最大可减小20%.同时,计算结果与磁场作用下的冻结流进行了比较,结果显示化学非平衡流中激波脱体距离比冻结流中小50%,滞止点温度低一半.

NUMERICAL SIMULATION OF MHD EFFECTS ON HYPERSONIC CHEMICAL NONEQUILIBRIUM FLOW

Three-dimensional hypersonic viscous chemical nonequilibrium flows around a blunt body are numerically investigated in a dipole magnetic field.The results show that the shock standoff distance increases by about 50%,local wall pressure coefficient and local skin friction coefficient decrease by about 37%and 20%,respectively in a dipole magnetic field B_0=1.353 T.Comparison of .those results with that of frozen flow under the magnetic field shows that both the shock standoff distances and temperatures at a stagnation point in chemical nonequilibrium flow decrease by about 50%.