扩张半角对无喷管助推器性能的影响分析(英文)

用数值分析的方法研究了扩张半角对固冲发动机无喷管助推器性能的影响规律.研究结果表明,随着扩张半角的增大,比冲先增加后减小,扩张半角取22°可使比冲达到近优:这一结论与有关文献的实验结果基本一致;从流动损失方面考虑,在无喷管助推器设计中,药柱出口端面与冲压喷管之间不应出现台阶,应使扩张段连续地过渡到冲压喷管上.本文结论可为无喷管助推器的设计改进提供参考.

Analysis on effects of expansion cone half angle on performance of nozzleless booster

Performances of nozzleless booster with different expansion cone half angles were studied by means of numerical a-nalysis method. The results show that the specific impulse approach the optimum when the expansion half angle is equal to 22° ,con-sistent with the experiment results in related documentary. On the other hand, there should be a continous transition between the exit plane of grain and expansion section of ramjet nozzle, without any steps. These results provide references for improving design of noz-zleless.