中文摘要：

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．

英文摘要：

In order to achieve successful transition of detonation wave from the pre-deto- nator to main detonation tube, numerical simulation was performed for the exits of different geometry shapes, and the diffraction characteristics of detonation wave were obtained from pre-detonator to main tube. The results show that when the pre-detonator has a straight noz- zle, the detonation waves cannot propagate upstream from the interface between the main combustor and pre detonator exit; when the pre-detonator exit has a 45-degree nozzle, the detonation wave can diffract to both sides in main eombustor. These results have been proved by laboratory experiments.