嵌套霍尔推力器的热优化策略研究

The high-temperature nature of nested Hall thrusters（NHT）has exerted a significant impact on their performance and reliability. In order to study the optimization strategy of the temperature distribution in NHTs，a solution of the heat conduction differential equations within the radiation transfer coefficient was employed to describe the heat transfer process in the NHT. Then，a temperature measurement test of the 50 kW-class NHT was conducted in the vacuum chamber，and the comparison between the calculation and the measurement results was used to justify and rectify the numerical model. The relative error of the rectified model was 4.8%. Based on those above，the temperature distribution of the NHT under the three optimization strategies was solved by the numerical model，and the temperature change pattern and mechanism under each optimization strategy were obtained. The results show that，under the case with all three optimization strategies，the temperature of the magnetic conductive part with the highest temperature can be reduced by about 90 K. Among the three optimization strategies，adding the radiator is the most remarkable cooling strategy，while the optimization effect of changing the thickness of the support column of the discharge chamber and replacing the surface treatment of the discharge chamber outer wall is slightly poor.