氩工质连续激光加热推力器的数值仿真

Numerical simulation of a continuous wave laser powered thruster with argon propellant

对氩气工质的连续激光推力器内加热与流动过程进行数值模拟,建立了包含激光吸收、化学反应、高温效应、黏性、扩散、热传导以及辐射效应等物理机制的模型.推力室内二维轴对称流场采用可压缩Navier-Stokes方程描述,用SIMPLEC(semi-implicit method for pressure-linked equations consistent)算法求解.对解算出的流场压力和黏性应力积分获得推力,其值与类似构型推力器的实验结果吻合较好.在不同流量条件下对推力器的流场进行了计算,通过分析其特征,提出了改进推力器性能的思路.

The heating and flow process in a continuous wave laser powered thruster using argon as propellant was modeled numerically.A model of physical mechanisms including laser absorption,chemical reaction,high-temperature thermodynamics properties,viscosity,diffusion,heat conduction and the effect of radiation was built up.The two-dimensional axisymmetric flow filed described by Navier-Stokes equations was solved by pressure-based SIMPLEC（semi-implicit method for pressure-linked equations consistent） algorithm.The thrust was computed by integrating the pressure and viscosity stress all over the wall,and the value was consistent with the experimental result of a similar configuration.Then the characteristics of the filed of a thruster under different mass flow rates were analyzed,and the methods for performance improvement were presented.