可渗透喷管壁面开孔角度对推力性能影响的数值研究OA北大核心CSTPCD

The permeable nozzle is a novel adaptive altitude compensation nozzle.This type of nozzle possesses great potential for single-stage-to-orbit propulsion systems.Numerical simulations of the permeable nozzle flow were conducted to reveal its flow characteristics and thrust performance.The wave system and thrust performance of the permeable nozzle were discussed when the pore opening angle in the nozzle wall permeable section changed from 30° to 145°.The results show that too large or too small open-ing angles can degrade the nozzle's over expanded compensation ability;under under-expanded conditions,the smaller the opening angle is,the smaller the nozzle thrust loss is.When NPR=70.00,compensation effect of the nozzle is the best and the thrust coeffi-cient can be increased by more than 24.5%.Based on the principles of optimal total ballistic performance,the optimum opening angle is 30°.