Numerical Simulation Of Flowfield About Solid Propellant Rocket Engine Altitude Simulated Test

In the development of the upper stage engine, the altitude characteristic of engine must be confirmed by test on the ground,it is necessary to build a vacuum experimental equipment on the ground to simulated altitude environment for upstage rocket engine test.The two throat type passive ejection altitude simulated test system is currently the main method of altitude simulated test.The test system has the advantages of simple structure, low cost.High temperature gas in altitude simulated test by the engine nozzle gets into the diffuser to slow down pressure, finally discharged into the atmosphere, while the gas of the upper compartment plays a role of injection, to ensure low pressure in altitude chamber.in the process The flow field is very complex in the diffuser so it has very important engineering value to study the flow field of the diffuser.The test is based on the altitude simulated test stand diffuser Nene flow problem and the use of FLUENT software,in order to provide reference for improving high modulus test bench diffuser design and work efficiency.1.Based on the N-S equation and Spalart-Allmaras turbulence model,altitude simulated test of flow field in stable operation was simulated by FLUENT software. Discussing the effect of particles on the flow field of the nozzle and diffuser flow structure and flow characteristics of gas.2.Effects of Al2O3 of different size on the particle convection field were studied. Separately the particle size of 10 micron,30 micron,50 micron,80 micron flow fields were simulated,and the distribution characteristic of different size particles in the nozzle.3.Make use of the related theoretical specific impulse calculation to draw up the specific impulse calculation procedure,and The results obtained by numerical simulation for the raw data on specific impulse of rocket engine were estimated, studying the influence of specific factors.4.The establishment of calculation model of engine flying high in the sky simulated the flow field in the high altitude flight engine. It analyses the characteristics of the engine at high altitude flight plume flow field.