| Citation: | ZHOU Rui, LI Jun, SHEN Chibing. Study on spray and combustion characteristics of LOX/LCH4 pintle injector[J]. Journal of Aerospace Power, 2025, 40（8）：20230152 doi: 10.13224/j.cnki.jasp.20230152
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To guide the optimization design of a liquid oxygen/liquid methane (LOX/LCH4) pintle injector, an oxidant-centered LOX/LCH4 pintle injector with a rectangular combustion chamber was processed, and its spray and combustion characteristics were explored through numerical simulation under different pressure drop conditions. Results showed that when the mass flow rate of each propellant was kept constant, increasing the pressure drop of radial LOX could decrease the block factor, which was not conducive to the rapid atomization of the axial LCH4, contributing to the development of the high combustion temperature towards the nozzle, and leading to lower combustion efficiency. Increasing the pressure drop of the axial LCH4 could decrease the total momentum ratio, which was not helpful for the formation of the poor-oxygen region on the head of the combustion chamber, resulting in the development of a local high combustion temperature. The optimal value of the pressure drop of both propellants was 22% of the combustion chamber pressure. The impact way of the two propellants of the pintle injector was beneficial to the rapid diffusion of chemical energy and can form stable vortices and shear layer flame, thus ensuring good combustion stability.
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