爆震管内扰流片对爆震波影响的数值分析

Numerical investigation of two-phase detonation with the osbstacles

关键词:  脉冲爆震发动机  扰流片  两相爆震  湍流  数值计算

Key words:  Pulse detonation engine  Obstacles  Two-phase detonation  Turbulence  Numerical calculation

摘要:

为了研究扰流片对两相爆震过程中燃烧转爆震的影响,建立两相低雷诺数湍流爆震模型,应用二维粘性CE/SE方法进行数值求解。结果表明,爆震波压力计算值与实验压力值符合得较好,扰流片的存在能显著缩短燃烧转爆震的时间；且对一固定尺寸的爆震管,扰流片的片数和间距都存在最佳值,使得燃烧转爆震时间最短。

Abstract:

To study how the number and distance affect the deflagration to detonation in pulse detonation engine, the low Reynolds turbulence two-phase detonation model is built. The method of two-dimensional viscous space-time conservation element and solution element (CE/SE) is deduced to calculate the gas-liquid two-phase interior flow field of pulse detonation engine (PDE).The numerical results agree well with the experimental results. The results show that obstacles in PDE can shorten the DDT time effectively. There exists an optimize obstacles to make the time of deflagration to detonation least for a PDE.