| Citation: | LIU Yunhao, WANG Chunmin, FENG Yuanxiang, et al. Ignition impact characteristics of LOX/LCH4 coaxial injectors[J]. Journal of Aerospace Power, 2025, 40（11）：20250036 doi: 10.13224/j.cnki.jasp.20250036
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In order to study the ignition impact characteristics of LOX/LCH4 coaxial injectors under oxygen rich conditions, the ignition experiments of bi-swirl coaxial injector, orifice-swirl coaxial injector and shear coaxial injector with injector relative recess lengths of 3 were carried out in a model chamber. The characteristics of steady ignition process and large impact ignition process of injectors were obtained, and the influences of injectors structure parameters and working condition parameters on ignition impact characteristics were obtained. The results showed that the ignition impact characteristics of the injectors were controlled by the injector structure and the LOX flow rate of the square hole. The injector structure controlled the mixing of the propellant in the indented region and then affected the ignition characteristics. The ignition characteristics of bi-swirl coaxial injector were the best, orifice-swirl coaxial injector was the second and shear coaxial injector was the worst. The shielding of the rectangular LOX to the propellant in the indented region was not conducive to ignition. For an orifice-swirl coaxial injector with recessed chamber liquid oxygen flow rates within the range of 0.4 kg/s to 0.5 kg/s and mixture ratios between 12.1 and 23.8, reducing the LOX flow rate of the square hole to less than 0.7 kg/s can inhibit ignition impact.
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