Investigation of several delay times in operation process of multi-cycle pulse detonation engine

In order to promote the operating coordination of a two-phase pulse detonation engine(PDE),the delay time of detonation and operating performance of the solenoid valve were experimentally studied by using ion-sensors and pressure transducers of high-frequency response.The detonation tube is of 58mm inner diameter and 1 270 mm long.Liquid gasoline/air mixture is filled for the engine multi-cycle operations.According to the research,the mixture ignition delay is 3～4.5 ms,the aero-valve closing delay is 4.9～6.4 ms,and the solenoid electric valve on/off delay time is 2.4 ms and 3.4 ms respectively.The transition time from deflagration-to-detonation is about 3.0～3.8 ms.The solenoid electric valve cannot operate orderly when the engine operating frequency is higher than 20 Hz.These data obtained are helpful to coordinate PDE operation process.