Effect of ejector inlet geometry on the performance of pulse detonation engine

An experimental investigation was described in which thrust augmentation was measured for two kinds of ejectors of Pulse Detonation Engine {PDE) with different inlet geometry using gasoline as fuel and air as oxidizers. Six rounded straight ejectors with distinct inlet contour and different diameter were designed. In this experiment, the rounded inlet and convergent inlet mounted on various straight ejectors were utilized to determine its effect on thrust augmentation by thrust transducer. The experimental results indicate that ejector system can augment the average thrust obtained from the pulse detonation engine alone. The performance of the ejectors with convergent inlet is better than that with rounded inlet when length-to-diameter ratio and diameter are constant. The ejector with ejector-to-PDE diameter ratio of 2.5 has better performance than the others when the ejector is at upstream position, which correspond to the maximum thrust augmentation value of 80.5%.