脉冲爆轰发动机预爆轰点火数值模拟

本文采用二维数值模拟对脉冲爆轰发动机点火方式中的预爆轰点火进行了分析研究。模拟了预爆轰管在主爆轰管上的两种最基本的布置方式：平行布置方式和正交布置方式。讨论了预爆轰管的布置方式和几何形状对点火的影响。结果表明：正交布置方式优于水平布置方式，因为反射激波在点火过程中起到了非常重要的作用。预爆轰管和主爆轰管的内径比是影响点火的重要参数，而长度的影响则较小。

Numerical simulations of pre-detonation ignition of pulse detonation engines

Two-dimensional numerical simulations are performed to study pre-detonation ignition of pulse detonation engines. The effects of the way of installment and the geometry of the pre-detonators on detonation transmission are studied and discussed. The pre-detonators are installed at the close end of the main detonation tube in two basic ways: either in parallel with or perpendicular to the main detonation tube. The results indicate that the perpendicular arrangement is better than the parallel one because the reflected shock waves play an important role in detonation transmission. The results also demonstrate that the diameter ratio of the pre-detonator to the main detonation tube is a very important parameter. The length of the pre-detonator is much less important than its diameter. For the case of the same mixtures, if the diameter is smaller than the critical diameter, detonation transmission cannot be assured by increasing the length of the pre-detonation tube alone.