关键词: 电弧喷射推进;推力器;化学非平衡模型+;数值仿真;流动分布

Abstract: To realize mechanism and characteristic of arcjet thrusters operating course perfectly, numerical simulations on operation of low power nitrogen arcjet thrusters with various constrictor diameters were achieved based upon chemical non-equilibrium modeling for them.The factors of decomposition, ionization and composition, which affect the operation, were taken into account in the modeling.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 second accuracy was used to solve Navier-Stokes equations coupled with electromagnetism and chemical reaction source terms,and finite control volume integral method was applied to solve electromagnetic equation derived from Maxwell’s equations.The results of numerical simulation display energy introducing, decomposition and ionization within the thrusters, and present thrust, specific impulse and thrust efficiency of the thrusters with various constrictor diameters.The results show that constrictor diameters have significant influence on operating performance of the thrusters.

Key words: Arc jet propulsion;Thruster;Chemical non-equilibrium modeling~+;Numerical simulation;Flow distribution