Abstract: The effects of oxygen content on the rotating detonation propagation characteristics of liquid kerosene in hollow combustion chamber have been investigated experimentally by varying the oxygen content of the oxygen-enriched air and equivalence ratio. For the hollow combustor, the oxygen content required for the stable propagation of liquid kerosene–oxygen-enriched air rotating detonation wave under ambient condition is successfully decreased to 0.28. The rotating detonation wave propagates in single wave mode under different oxygen contents and equivalence ratios during the experiment. When the equivalence ratio is approximately 1, the average velocity of the detonation wave increases with the increase of the oxygen content in the oxygen-enriched air. For the oxygen content of 0.28, the average propagation velocity of the rotating detonation wave is 1742.7 m/s, and under lower oxygen content condition, the detonation wave propagation velocity is lower than the theoretical velocity, while under higher oxygen content condition(0.34~0.43), the detonation wave is over-driven. The oxygen content has a significant impact on the stability of the detonation wave: under an oxygen content of 0.28, when the equivalence ratio increases to 1.31, the detonation stability is poor，while at an oxygen content of 0.38, the detonation wave still maintains a high level of stability when the equivalent ratio is 1.35.

Key words: liquid kerosene, rotating detonation, hollow combustor, oxygen content, propagation characteristic