单脉冲激光能量沉积对超声速钝头体波阻的影响

采用数值模拟和实验手段对单脉冲条件下的激光能量沉积减小超声速钝头体波阻进行了系统地研究。首先利用数值仿真的方法模拟了马赫5的超声速气流条件下,能量沉积对半球体阻力特性的影响,通过压力温度等值线及驻点参数的变化规律,分析了能量沉积减阻机理。研究结果表明由于能量的注入,钝头体前弓形激波发生变形,激波脱体距离增大,降低了钝头体表面的压力,从而减小了钝头体的波阻,在单脉冲作用时间内,波阻减小了13%。建立了超声速条件下单脉冲激光能量沉积减阻实验系统,利用高分辨率的纹影系统拍摄激光能量沉积产生的激波与弓形激波相互作用过程,实验结果与数值模拟结果基本吻合。

Effect of single pulse laser energy deposition on wave drag of supersonic flow blunt bodies

Both numerical simulation and experiment are used to research the effect of single pulse laser energy deposition on supersonic wave drag.First,under the supersonic flow of Ma 5,the effect of energy deposition on wave drag is investigated with numerical simulation.The reason of drag reduction is analyzed by the law of the pressure,temperature contours and the parameter change of stagnation point.The results show that the bow shock over blunt body is deformed due to the energy deposition.The shock stand-off distance is increased,the surface pressure of blunt body is decreased and the wave drag is reduced by 13%.The experimental system is set up,and the interaction of shock and bow shock over the blunt body is screened by the schlieren system.The results of experiment and simulation are almost consistent.