引射器轴向位置对PDE的性能影响实验

根据脉冲爆震发动机(PDE)工作特点为其设计了6组不同结构的圆柱型引射器,并针对各种结构引射器,采用力传感器法对不同轴向位置处引射器的增推性能进行了实验研究,实验采用汽油为燃料,空气为氧化剂。实验结果发现,轴向位置对引射器的增推性能有非常明显的影响,当引射器入口正好位于脉冲爆震发动机出口处(0点)或位于下游1/2倍脉冲爆震发动机直径处时,系统会出现一个至少高于35%的推力增益点,但是当引射器入口从该点继续远离发动机出口位置时,推力将会急剧地下降;当引射器从0点逐渐向上游移动时,引射器的推力增益呈先下降后上升再下降的趋势,最高推力增益可达80.5%。

Effect of ejector axial position on performance of pulse detonation engine

Six rounded straight ejectors with distinct inlet contour and different diameter were designed based on the operational principle of pulse detonation engine(PDE).A preliminary experimental investigation of the different construction ejectors on a multi-cycle pulse detonation engine tube was performed using gasoline as fuel and air as oxidizers,and the thrust augmentation was measured by thrust transducer for different ejectors axial position.Performance measurements of the PDE-ejector system show that the thrust augmentation is a strong function of the ejector axial position.Thrust augmentations of more than 35% are obtained when the axial location is 0 or 0.5,but decrease drastically with ejector moving downstream.The thrust augmentations decrease at beginning and increase next,but decrease finally when ejector is moved upstream from 0 position.Peak thrust augmentation level is recorded to be approximately 80.5% at upstream position.