Pulse detonation engines (PDEs) with three different types of nozzle–straight ejector combinational structures at three different ejector positions were simulated by the unsteady 2-D axisymmetric method to understand the influence of nozzle–ejector combinational structures on the performance of PDEs. Three types of nozzles included the straight nozzle, convergent nozzle, and convergent–divergent (CD) nozzle. Three ejector positions were considered according to the ratio of the distance between the nozzle outlet and the ejector inlet to the diameter of PDEs (Δx/d). Propane was used as the fuel and air as the oxidizer. The simulation results indicated that for the PDE with the straight nozzle, it took the shortest time for high-temperature burnt gas to exhaust from the detonation tube. For the PDE with the CD nozzle, the time at which the ejector was filled with external air was the fastest. Within the time range of t = 0–10 ms, the ejected air was less than the original air in the ejector among all the nine combinational structures. The maximum ejected air was obtained with the convergent nozzle, followed by the CD nozzle, and the minimum with the straight nozzle. For certain nozzles, the maximum air was ejected at the ejector position of Δx/d = +1, followed by the ejector position of Δx/d = 0, and the minimum at the ejector position of Δx/d = −1. For the convergent nozzle–ejector combinational structure, the air ejection speed was the fastest. Oxygen concentration distribution in the PDE with the CD nozzle was more uniform along the axial direction than the other nozzles.

通过非稳态二维轴对称方法模拟了在三个不同喷射器位置具有三种不同类型的喷嘴-直线型喷射器组合结构的脉冲爆震发动机（PDE），以了解喷嘴-喷射器组合结构对PDE性能的影响。三种类型的喷嘴包括直喷嘴，会聚喷嘴和会聚-发散（CD）喷嘴。根据喷嘴出口和喷射器入口之间的距离与PDE直径的比值（Δx/ d），考虑三个喷射器位置。丙烷用作燃料，空气用作氧化剂。仿真结果表明，对于带有直喷嘴的PDE，高温燃烧气体从爆震管中排出要花费最短的时间。对于带有CD喷嘴的PDE，喷射器充满外部空气的时间是最快的。在以下时间范围内t = 0–10 ms，在所有九种组合结构中，排出的空气少于排出器中的原始空气。使用会聚喷嘴获得最大的喷射空气，其次是CD喷嘴，而使用直喷嘴获得的最小空气。对于某些喷嘴，最大空气在Δx/ d = +1的喷射器位置处喷射，随后是Δx/ d = 0的喷射器位置，最小空气在Δx/ d = -1的喷射器处喷射。对于会聚的喷嘴-喷射器组合结构，空气喷射速度最快。带有CD喷嘴的PDE中的氧气浓度分布沿轴向比其他喷嘴更均匀。