关键词: 固体贫氧推进剂, 固体富燃燃气, 旋转爆轰发动机, 传播特性, 二次点火

Abstract: Solid propellants exhibit high energy density and superior reliability, rendering them a promising fuel option for rotating detonation engines. To address the challenge of initiating between the fuel-rich gas generated by combustion of solid propellants under oxygen-deficient conditions and air, a hollow combustor was utilized to enhance the energy release of the fuel in this paper. Successful rotating detonation combustion of solid fuel-rich gas with pure air was achieved, and the propagation characteristics and mode evolution pattern of the rotating detonation wave were analyzed in detail. The experimental results show that the rotating detonation wave was successfully established approximately 296.6 ms after the ignition of the pre-detonator, and it propagated in the combustor with a single wave mode of the clockwise direction (Combustor exit perspective), achieving a propagation velocity of 1 439.1 ± 16.6 m/s and an average peak pressure of approximately 0.37 MPa in the stable operating phase. Except for a significant velocity fluctuation during the secondary ignition, the relative standard deviation of the wave velocity in the stable propagation process was less than 11%. The study results can significantly advance the engineering application of solid fuel-rich gas rotating detonation ramjet engines.

Key words: solid fuel-rich propellant, solid fuel-rich gas, rotating detonation engine, propagation characteristics, secondary ignition