Influence of Combustor Configuration on Rotating Detonation Characteristics of Kerosene Pre-combustion Cracking Gas
The width and outlet blockage ratio of rotating detonation combustion chamber are changed under the condition of fixed incoming flow.The effect of combustor configuration on the rotating detonation characteristics of kerosene pre-combustion cracking gas and air was experimentally investigated.The experimental results show that suitable combustor width and outlet width can promote stable self-sustaining propagation of rotating detonation wave(RDW).When the width of combustor is 20 mm or 26 mm and the width of combustor outlet is 4～8 mm,the kerosene pre-combustion cracking gas and air can be successfully detonated and can propagate stably.The propagation velocity and stability of RDW are improved by increasing the width of combustor.With the increase in outlet blockage ratio,the RDW propagation mode experiences stable single rotating detonation wave(SRDW)mode,intermittent single rotating detonation wave(ISRDW)mode and two-co rotating detonation waves(TCORDW)mode.The blockage ratio can be increased to improve the intensity of reflected shock wave at the end of combustor and promote the generation of multiple wave heads.RDW propagation velocity and pressure increase first and then decrease with the increase in blockage ratio.
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