Simulation Of Working Performance Of Micro Ultra-High Pressure Cold Gas Propulsion System And Its Component

For now there are no researches focused on the working performance of cold-gas propulsion system with60MPa or higher gas pressure, so my thesis mainly simulation the working performance of cold-gas propulsion system with ultra-high gas pressure from60MPa to120MPa.The object of my study is one type of micro cold-gas propulsion system with ultra-high pressure. By simulation1will analyze the working performance of cold-gas propulsion system and its key component:pressure relief valve, solenoid valve and nozzle.The simulation of cold-gas propulsion system is based on1-D simulation software Amesim. By setting up the model of each component and linking them, I got the entire model of cold-gas propulsion system. The simulation was mainly based on the transient and steady working performance of micro cold-gas propulsion system. The transient working performance mainly focused on the pressure changing process in pressure chamber, the pressure shock characteristic at the inlet of pressure, the displacement curve of spool and the response characteristic of thrust. With the results above, I could analyze the transient working performance of cold-gas propulsion system. The steady working performance mainly focused on the changing process of temperature and pressure in the gas cylinder and pressure chamber.The simulation of pressure relief valve is based on3-D simulation software CFX using the Fluid-structure interaction method. The simulation concerned the pressure changing process in pressure chamber, the displacement curve of spool and pressure distribution in the pressure relief valve during the filling, opening and closing process. By variable parameter study method, I found the best parameter configuration.The working performance of solenoid valve was simulated by Maxwell by setting up the model of magnet yoke, coil and armature. At the same time I did the variable parameter study about driving voltage, armature travel, preloading force and turns of coil. The simulation of nozzle is performed on CFX. By variable parameter study method, I got the influence of inlet pressure, inlet temperature, shape of nozzle and divergence ratio of nozzle on thrust. Last, I got the thrust building process under steady and pulsing working circumstance by control the displacement of armature with CEL language.