微电推进贮供系统开发与系统级仿真研究

The traditional electric propulsion feeding system has the problems of huge weight and volume，which is not adapted to micro-satellite missions. In order to solve these problems，a small，light and low-cost micro electric propulsion feeding system was designed and built. The capillary made of composite PEEK is used to replace the metal capillary for micro flow control. The experiment with Krypton as working gas verified that it can provide a stable mass flow of 0.0291~0.4145mg/s within ± 1% control accuracy. Secondly，the system-level one-dimensional transient model was constructed in Amesim for simulation of the micro electric propulsion feeding system. The comparison between simulation and experiment results verified the effectiveness and accuracy of the model. The further analysis of the simulation results illustrated the operating characteristics of the system from opening section to stable section，such as pressure overshoot，flow fluctuation in the stable section，and the influence of the key parameters such as the spring and diaphragm stiffness of the pressure reducer，and the inner diameter of the capillary. Through analysing the dynamic changes of the thermal state parameters for each component，the physical mechanism of the coupling effect of flow，heat transfer and control in the process of the supply of working gas to the downstream was revealed.