预爆管爆震波衍射特性数值研究

为了实现预爆管出口爆震波向主爆管的成功传播,针对预爆管出口不同几何形状,开展了数值模拟研究,获得了爆震波从预爆管向主爆管传播的衍射特性.研究表明:当预爆管出口为直喷管时,不能实现向预爆管出口截面上游传播的爆震燃烧;当预爆管出口扩张角为45°时,可以实现爆震波在主爆管内向衍射面上、下游传播,研究结果获得的爆震波衍射特性得到了试验验证.

Numerical investigation on diffraction characteristics of detonation wave from pre-detonator

In order to achieve successful transition of detonation wave from the Initiator to main detonation tube. Toward exits of different geometry shape, Diffraction characteristics of detonation wave were obtained from small tube to big tube through the means of numerical simulation. The results showed that when the initiator with straight nozzle, detonation waves cannot propagate upstream from the interface that is between the main combustor and initiator exit, while when the initiator exit with 45 degree nozzle, detonation wave can diffract to both sides in main combustor. these results have been proved by experiments in laboratory.