磁控等离子体对收敛喷管性能的影响

采用诱导磁场方程,Mixture混合两相流和磁场修正的湍流两方程模型,研究施加不同强度磁场时,收敛喷管内等离子体的流动和传热特性以及等离子体对尾喷流的包裹情况.结果表明,随着气流在收敛喷管内加速,等离子体被掺混的程度增加.增强磁场可提高近壁面处等离子体体积分数,抑制其湍流度,降低高温气体向喷管壁面的传热.当B_y=1.3T时,磁控等离子体可降低54.4%的壁面温升,增加0.74%的喷管推力系数,在出口4倍当量直径处对尾气仍有一定的包裹. 

Influence of magnetic plasma on performances of the convergent nozzle

The characteristics of flow and heat transfer for plasma controlled by external magnetic fields in the convergent nozzle and the jet wrapped by the plasma were simulated using the models of magnetic induction equation,the multiphase flow mixture and modified turbulent two-equations under magnetic forces.The results show that the plasma volume fraction decreases with the acceleration of flow in the convergent nozzle.Magnetic intensity increase may improve the plasma volume fraction near the wall and suppress its turbulence strength,thereby cutting down the increase of nozzle wall temperature effectively.The rising wall temperature is reduced by 54.4%,the thrust coefficient is increased by 0.74% and the jet is still wrapped at 4D* from the nozzle exit after applying the 1.3 T magnetic field.