激光等离子体点源减阻技术中入射能量对气动阻力的影响

Effects on aerodynamic drag of incident laser energy in technology of laser plasma point source drag reduction

关键词:  激光等离子体  减阻技术  气动阻力  弓形激波  斜激波

Key words:  Laser plasma  Technology of drag reduction  Aerodynamic drag  Bow shock wave  Oblique shock wave

摘要:

数值模拟了来流马赫数为5时的圆球绕流冷流场,以及来流与头部驻点附近注入激光能量而产生的等离子体相互耦合形成的流场的演化过程。计算结果表明:施加局部能量点源能够改变原有的弓形激波结构,使其变为斜激波,从而减小气动阻力;气动阻力随入射激光能量的增大而逐渐减小,当入射激光能量为1.1 J时,气动阻力减小的百分比高达40%。

Abstract:

Cold flow field around a pellet at Mach 5 was simulated numerically.Coupling flow field between supersonic inflow and laser plasma,which was produced by injecting laser energy into the stationary point of pellet forebody,was simulated numerically.Results indicate that adding local energy point source can transform bow shock wave into oblique shock wave,thereby aerodynamic drag can be reduced.Aerodynamic drag reduces gradually with the increasing of incident laser energy.When the laser energy is 1.1 J,percent age of drag reduction is up to 40%.