Study On Design Of Concentric Nested-channel Hall Thruster

The nested Hall thruster have because the most effective way to achieve high power Hall Thruster and reduce the space volume and weight.Based on the nested channel Hall thruster’s work principle,in this paper,the author had carried out some design and analysis work of the nested hall thruster with the theory analysis and numerical simulation,which contains the parameters design,the Magnetic Structure Design and the Thermal Design.The author discussed the structure and work principle of nested Hall thrusters,and analyzed the discharge power amplification pathway of Hall thrusters.The relationship between the operating parameters and structure parameters was discussed.And a suitable design flow path for the nested Hall thruster was raised.This paper had designed the operating parameters and structure parameters of a nested Hall thruster,whose discharge channel is two,the power levels is 18 kW,the anode specific impulse is 1704 s.The results show that the hall thruster which is at moderate discharge power should adopt single discharge chamber configuration.The magnetic structure is designed for NH-2,and the location and configuration of the components is optimized to achieve reasonable magnetic configuration.By collocating the trim coils,the zero magnetic area appeared in the anode outlet of the out discharge cavity.The "double C" magnetic circuit model for NH-2 was raised,and the relationship between the peak numerical value of magnetic field in the discharge channel and the current value of the respective excitation coils was raised.The correction method about trim coil will change the magnetic field peak was proposed.By summarizing the power loss mechanism for NH-2,the thermal load value of NH-2 is calculated;the loading area is determined.The coil is equivalent to a new material and its thermal performance parameters were calculated.After defining the thin thermal resistance and boundary conditions,the ignition conditions and working conditions were carried out by using COMSOL software,the temperature distribution of NH-2 was achieved.Thermal simulation results show that the thermal design of the NH-2 is desirable.By building a MHD model,some of the performance parameters of NH-2 was predicted.Allocating the magnetic shield can improve performance parameters was proved.