Ignition and combustion experiments are conducted on a kerosene-fueled direct-connected com-bustor for free flow of Mach 6.5(combustor entrance Mach 3.1)and total temperature 1 660 K to research the ap-plicability of in-wall cavity in a circular cross-section combustor.The flow-field images of kerosene ignition,flame maintenance and propagation are obtained by focusing shoot,the effects of equivalent ratio(ER),fan-shaped angle between two adjacent cavities(θ)and the kerosene ignition position on the flow-field are ana-lyzed and compared with those of the combustor with traditional circular cavity.Conclusions can draw as fol-lows:(1)Kerosene can be ignited at different θ and ER when injected from the bottom wall of the in-wall cavity with different flame maintenance.(2)Steady combustion are obtained for different θ when injected from the up-stream wall of the in-wall cavity,but the variation of θ of this case has less influence on the kerosene combustion compared with those injected from the bottom wall of the in-wall cavity.(3)Combustion effect of kerosene is bet-ter when injecting from the upstream of the in-wall cavity with same θ.The in-wall cavity has some application potential for circular cross-section combustor but optimization and improvement and experiment are needed for further study.
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