Oxygen concentration distribution in a pulse detonation engine with nozzle–ejector combinational structures
Oxygen concentration distribution in a pulse detonation engine with nozzle–ejector combinational structures
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DOI：
10.1177/0954410021991284
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Zhiwu Wang;Lisi Wei;Weifeng Qin;Zijian Liang;Kun Zhang
中科院分区：
文献类型：
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作者：
Zhiwu Wang;Lisi Wei;Weifeng Qin;Zijian Liang;Kun Zhang
采用非定常二维轴对称方法对具有三种不同类型喷嘴-直式喷射器组合结构、三个不同喷射器位置的脉冲爆震发动机（PDE）进行了仿真，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、收敛喷嘴和收敛-发散(CD)喷嘴。根据喷嘴出口和喷射器入口之间的距离与 PDE 直径的比率 (Δx/d) 考虑了三个喷射器位置。使用丙烷作为燃料，空气作为氧化剂。仿真结果表明，对于直喷嘴的PDE，高温已燃气体从爆震管排出的时间最短。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t=0~10 ms的时间范围内，所有9种组合结构中喷射出的空气均少于喷射器内原有的空气。收敛喷嘴的喷射空气量最大，CD 喷嘴次之，直喷嘴的喷射空气量最小。对于某些喷嘴，最大空气在喷射器位置 Δx/d = +1 处喷射，其次是喷射器位置 Δx/d = 0，最小空气在喷射器位置 Δx/d = -1 处喷射。对于收敛喷嘴-喷射器组合结构，空气喷射速度最快。使用 CD 喷嘴的 PDE 中的氧气浓度分布沿轴向比其他喷嘴更均匀。
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.