单相发汗冷却对脉冲爆震燃烧传播的影响

As an advanced propulsion system,the thermal load on the hot end components of a pulse detonation engine significantly increases with the rise in operating frequency and Mach numbers. Transpiration cooling has greater cooling efficiency and less coolant consumption,making it a promising cooling solution for the pulse detonation engines combustion chamber wall. Research on the coupling relationship between transpiration cooling and detonation propagation forms the theory foundation of transpiration cooling design for the pulse detonation engines. In order to explore the effects of solid and fluid structures on detonation combustion in transpiration cooling,an investigation into the propagation characteristics of full development of detonation with different porous media structures and single-phase transpiration cooling was conducted via an experimental method. The results indicate that the detonation wave decelerates as it propagates along the porous media wall but does not lead to detonation failure. The primary reason for detonation failure induced by single-phase transpiration cooling is the dilution of the coolant,resulting in local equivalence ratios below the explosive limit of the fuel. When the coolant injection ratio exceeds 12.5%,detonation combustion becomes decoupled.