微波等离子推力器喷管流动数值模拟

为了准确把握微波等离子推力器喷管流动的机理与特点,采用冻结流和非平衡流两种模型对其进行了对比数值模拟分析。非平衡流模型考虑了流动过程中的分解反应、电离反应和复合反应,化学动力学模型为4组分、4反应的有限速率化学反应模型,采用二阶精度NND格式数值求解耦合化学反应源项的N S方程组。数值模拟的结果揭示了喷管内的流场结构,反映了喷管内的离解电离状况,得到了推力器的推力和比冲。分析表明,数值方法有效,计算结果合理,具有工程应用价值,能为相关研究提供参考。

Numerical simulation for the flow fields within microwave plasma thruster nozzle

To realize the mechanism and characteristic of the flow within Microwave Plasma Thruster(MPT) nozzle,numerical simulation and analysis were achieved by developing both frozen and non-equilibrium flow models for it. The factors of decomposition,ionization and composition,which affect the flow,were taken into account in non-equilibrium flow model. Four-ingredient and four-step finite-rate chemical reaction model was adopted in the chemical kinetics model. Non-oscillatory and Non-free-parameters Dissipative finite difference scheme with two order accuracy was used to solve Navier-Stokes equations numerically. The results of numerical simulation display the flow distribution,decomposition and ionization within the nozzle,and predict the thrust and specific impulse of the thruster. Analyses of the results demonstrate that the numerical method is effective,the results are reasonable,and the conclusions are helpful to work concerned.