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.