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对连续激光维持的等离子体加热推力器内流场建立一种计算模型,考虑的物理机制包括化学反应、高温气体性质、激光吸收、黏性、扩散、热传导以及辐射效应,模型方程形式为可压缩轴对称Navier-Stokes方程,对方程采用SIM-PLEC算法求解。在吸收室压强、聚焦光束形状参数及喷管构型相同的条件下,模拟了氩为工质的推力器比冲随激光束功率变化和氢为工质的推力器比冲随喷管喉部半径的变化情况。研究结果表明:由于热物理性质不同,氢为工质的推力器具有更高性能;较小的推力器内部流道可提高工质比焓和加热均匀性,能够获得更大比冲。
A computational model was established for the plasma flow in a thruster maintained by a continuous laser and the physical mechanisms considered included chemical reactions, high temperature gas properties, laser absorption, viscosity, diffusion, heat conduction, and radiation effects. The model equations were compressible Axisymmetric Navier-Stokes equations, the equation using SIM-PLEC algorithm. Under the conditions of the pressure in the absorption chamber, the shape parameters of the focused beam and the nozzle configuration, the thruster specific argon with working fluid was simulated and compared with the change of laser beam power and the thruster specific impulse of hydrogen as the working fluid. Radius changes. The results show that, due to the different thermophysical properties, hydrogen-based thrusters have higher performance; smaller thrusters internal flow channels can increase the specific enthalpy and heating uniformity of the working fluid and obtain larger specific impulse.