激光等离子体空气冲击波前参量的测定及研究

An Investigation of Parameters on the Front of Laser Plasma Shock Wave

根据空气中激光等离子体冲击波自由衰减条件下的波前传播方程和冲击波波阵面处动量、能量、质量守恒定律 ,给出了冲击波波阵面处温度、压强、气体密度、粒子运动速度等重要参数的计算公式 ,并与实验数据进行了比较。结果表明当波速小于空气中正常声速的 1 5倍时 ,波阵面处出现热力学量参数突变的冲击波模型不再适用 。

Under the condition of free attenuation of shock wave, based on the momentum, energy and mass conservation, the formulae of calculating laser plasma shock wave front temperature, pressure, density and velocity have been given. Only if the shock wave velocity is 1.5 times greater than the local sound speed, the calculation results agree well with experiments. Otherwise some new transition characteristics arise and the shock wave model is no longer applicable.