Investigation of Thrust Augmentation and Acoustic Performance by Ejectors on PDE

摘要

Thrust augmentation and acoustic performance of a Pulse Detonation Engine (PDE) with ejector system is experimentally investigated. For these tests the L-Ejector/D-Ejector is varied from 1.18 to 4 and the axial placement of the ejector relative to the PDE exhaust is varied from an x/DPDE of -3 to 3. Results from the tests show that the optimum L-Ejector/D-Ejector based on thrust augmentation and Overall Sound Pressure Level (OASPL) is found to be 2.61. The divergent ejector performed the best based on thrust augmentation, while the reduction effect for OASPL and Peak Sound Pressure Level (PSPL) at 60 degrees is most prominent for the convergent ejector. The optimum axial position based on thrust augmentation is determined to be x/ D-PDE = 2, while, x/D-PDE = 0 based on OASPL and PSPL.