Abstract: The duty cycle for kerosene/oxygen injection and time sequence for injection, mixing and ignition to produce two-phase and fully-developed detonations are investigated in a pulse detonation rocket engine model, which uses solenoid valves for intermittently supplying propellants. In some given supply conditions, the detonable ranges in terms of injection duty cycle and the control law are obtained. In the final analysis, these effects stem from the appropriate equivalence ratio and mixing. The experimental results show that to gain reliable detonations, the injection duty cycles for kerosene and oxygen should ensure enough filling first and then the injection time phases and duty cycles should keep as close as possible to attain the effective mixing.

Key words: two-pulse detonation, detonable range, experimental investigation.