| Citation: | MA Pengfei, FENG Zaijie, ZHANG Haotian, et al. Experimental research on operating characteristics of pulse detonation engine at elevated initial pressure[J]. Journal of Aerospace Power, 2026, 41（4）：20240422 doi: 10.13224/j.cnki.jasp.20240422
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To investigate the effect of high initial pressure on the initiation and propagation characteristics of detonation waves in pulse detonation engines, and to further explore the stable propagation characteristics of high-frequency detonation, experimental studies were conducted in a 10 mm inner diameter detonation tube with ethylene as fuel and oxygen-enriched air (40% by volume) as oxidizer. The initial high-pressure conditions were successfully achieved in the detonation combustion using different contraction ratios, with a maximum initial pressure of 0.68 MPa. The results showed that an increase in contraction ratio and supply pressure could increase the initial pressure of the combustion. As the contraction ratio increased, the initial pressure increased, and the DDT distance first decreased and then increased, reaching a minimum value at the contraction ratio of 2.04. When the contraction ratio was less than 2.04, the peak pressure of the detonation wave increased linearly with the initial pressure. As the initial pressure increased, the range of stable detonation frequency broadened, but the peak pressure fluctuations of detonation wave increased. When the contraction ratio exceeded 2.04, an increase in initial pressure caused the stable detonation mode to transition to the unstable detonation mode.
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