Effect of operating frequency on performance of pulse detonation engine driven ejector

A preliminary experimental investigation of the thrust augmentation performance of a round, straight ejector on a multi-cycle pulse detonation engine (PDE) was performed while using gasoline as fuel and air as oxidizers. The average thrusts of the PDE with ejector and without ejector were measured with thrust transducer at different detonation frequencies and different length-to-diameter ratios of the ejector. The experimental results indicate that ejector system alone can augment the average thrust obtained from the pulse detonation engine. The maximum value of the average thrust augmentation is found to be about 64.4% when the detonation frequency is 25 Hz. The optimal value of the ejector length-to-diameter ratio is 4.58 when the ejector inner diameter and the operation frequency are constant, which corresponds to the best thrust augmentation performance.