Design And Research On Micro-Flow Pulsed Gas Supply Valve

The pulsed inductive thruster has shown the character of high specific impulse, high efficiency and long service life in the past research, these merits also make it become a new research hotspot in the field of space electric propulsion. In this paper, some design and analysis work were carried out based on the thruster’s work principle, all the work through the paper aim at improving the dynamic response of the pulsed gas supply valve.A novel electro-mechanical converter structure scheme was put forward in order to meet pulsed inductive type thruster’s requirement for the rapid response of propellant supply valve. The factors influencing the dynamic performance as well as the flow characteristic of the valve were analyzed in details, and then establish the magnetic structure model by using the method of permeance analysis, the Ansoft simulation results showed that the average air-gap magnetic induction intensity of the structure can reach 1.1T. The movable component was designed when all the electro-mechanical converter structure dimensions fixed, and analysis on the static magnetic characteristic and output force followed.Excitation form was identified and the switch dynamics model was established according the valve movement process. On the condition of ignoring eddy current, Matlab/Simulink simulation result showed that the open close time are 179/174 μs when the opening/closing excitation are(1450V/-550V)/(-1150V/650V),and Ansoft in the same excitation conditions simulated the opening and closing times are both 174μs. Taking into account the impact of eddy currents, when the open/close excitation are(2200V/-450V)/(-1250V/750V), Ansoft get the opening and closing time were 178 μs and 176 μs respectively.