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。 The influence of expansion half angle on the performance of nozzleless booster of solid flushing engine was studied by numerical analysis. The results show that with the increase of half-angle of expansion, the specific impulse first increases and then decreases, and the specific half-angle of expansion half-angle increases to 22.5. This conclusion is consistent with the experimental results in the literature. From the aspect of flow loss In nozzleless booster design, there should be no step between the outlet end of the column and the punching nozzle. The expansion section should be continuously transferred to the punching nozzle. This conclusion can provide a reference for the design improvement of nozzleless booster.