均匀磁场中高超声速弱电离气体流动数值模拟

采用7组元化学模型并应用组分公式计算电导率,通过求解黏性MHD(magneto-hydro-dy-namics)方程组,研究了不同强度均匀磁场对三维钝头体高超声速绕流化学非平衡流动的影响.结果表明,随着磁场的增强,激波脱体距离逐渐增加;总阻力系数和壁面温度逐渐减小.在B_y=0.03 T磁场作用下,与无磁场的结果相比,化学非平衡流中的激波脱体距离增加约7%,总阻力系数减小约5%,局部壁面温度最大降低74%;而冻结流中的激波脱体距离增加约43%,总阻力系数减小约6.9%,局部壁面温度最大降低18%. 

Numerical simulation of weakly ionized gas hypersonic flow under uniform magnetic field

Seven-species air model was used and electrical conductivity was calculated by species formula to investigate the effects of the intensity of uniform magnetic field on three dimensional chemical nonequilibrium hypersonic flows around a blunt body by solving the viscous MHD(magneto-hydro-dynamics) equations.The results show that the shock standoff distance is increased and total drag coefficient and wall temperature are reduced with increasing external magnetic field.At B_y=0.03 T,the shock standoff distance is increased by about 7%,total drag coefficient and local wall temperature in nonequilibrium flow are decreased by about 5% and 74%,respectively.However,in frozen flow under the same conditions,the shock standoff distance is increased by about 43%,total drag coefficient and local wall temperature are decreased by about 6.9% and 18%,respectively,as compared with that without magnetic field.