Investigation on effect of injector orifice diameter on injector atomization and combustion characteristics of pulse detonation combustor

To reduce the fuel consumption rate of the pulse detonation combustor (PDC), an experimental study was carried out to study the influence of the injector aperture on the atomization particle size of the pneumatic atomization injector and its combustion characteristics of the PDC. The test used gasoline\air as the fuel and oxidant, tested the atomization particle size and obtained the detonation characteristics of PDC. The research results show that the atomization particle size of the injector under the three apertures decreases with the increase of the mixed air volume and increases with the increase of the fuel flow rate. The injector atomization effect is better when the aperture is 1.4 mm, the atomization particle size range is 71.8–119.8 μm. PDC using different injectors can achieve stable operation in the range of 5–20 Hz. Under the same working conditions, the smaller the injector aperture, the higher the average detonation pressure of the PDC.