Influence of high-pressure intermittent fuel supply mode on operation characteristics of pulse detonation combustor

In order to reduce the atomization particle size in a liquid fueled pulse detonation combustor (PDC), a high-pressure intermittent fuel supply system was designed and tested with a U-shaped PDC (U-PDC). Influence of high-pressure intermittent fuel supply mode on the initiation characteristics of the U-PDC was experimentally investigated. Gasoline\air was used as fuel and oxidant in the test, the atomization particle size of high-pressure direct injector was obtained and the detonation characteristics of U-PDC were analyzed. The results show that the particle size of a single direct spray is 10 μm to 30 μm, and the atomization particle size of the three direct injector combination is about 20 μm to 55 μm under simulated operating conditions. Smaller atomization particle size is conducive to fuel evaporation and participation in combustion The high-pressure intermittent fuel supply mode can realize stable operating with the U-PDC from 10 Hz–30 Hz, and reduce the influence of the periodic pressure pulsation in the detonation chamber on the fuel supply stability. The detonation wave velocity increases with the increased frequency, and the DDT distance is shortened from 733 mm to 616 mm. This laid the foundation for subsequent high-pressure intermittent fuel supply technology in PDC.