| Citation: | LUAN Shaolei, WU Jiping, ZHANG Jiaqi, et al. Simulation study on the spray and mixing characteristics of a liquid-liquid throttleable pintle injector[J]. Journal of Aerospace Power, 2025, 40（7）：20240230 doi: 10.13224/j.cnki.jasp.20240230
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With the growing use of throttleable liquid rocket engines, a simplified physico-mathematical model for a plane thruster chamber’s unit, equipped with liquid-liquid throttleable pintle injectors, was formulated and numerically simulated. Spray, flow, and mixing characteristics of the injector spray were analyzed. The impact of film angle and momentum ratio on these characteristic was determined. Results revealed a distinct oxygen-rich low-velocity zone, with fluid crushing influenced by total momentum. Flow exhibited a unique recirculation zone beneath the injector sleeve, where vorticity was intensified with momentum ratio rise, unaffected by film angle. Variations in film angle and momentum ratio altered the radial velocity near the impact, affecting the flow rates regionally. Mixing efficiency declined with film angle increase, while kerosene space utilization initially rose then fell with momentum ratio from 1.5 to 3.0, peaking at about 2.37.
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