脉冲爆震发动机喷管性能数值分析

采用详细的化学反应机理,对脉冲爆震发动机的不同结构喷管进行了二维轴对称单循环数值模拟.分析了爆震波在爆震室内的传播过程以及传出后的流场情况,模拟所得的爆震波参数与STANJAN值较为一致.对4种单喷管和4种组合喷管的性能模拟结果表明:扩张喷管可以产生最大的瞬时推力峰值和比冲;带引射的组合喷管产生的平均推力比单喷管产生的平均推力要大.最后对非稳态引射过程进行了分析,为提高脉冲爆震发动机的性能提供参考.

Computational analysis on the nozzle performance of pulse detonation engines

Two-dimensional axisymmetric numerical simulation was carried out, using single-cycle and detailed chemical reaction kinetics of hydrogen/air mixture, to investigate different nozzle effect on the performance of pulse detonation engines. The simulated results of detonation wave parameters are close to the value of a chemical equilibrium solver named STANJAN. The results of numerical simulation with four single-nozzles and four combined-nozzles indicate that the largest instantaneous thrust and specific impulse are obtained in divergence nozzle; the average thrust generated by the combined-nozzle with ejector is larger than that by the single-nozzle. Furthermore, the mechanism of unsteady ejection was analyzed, which would offer references to augment the performance of pulse detonation engines.