| Citation: | ZHU Zetao, LYU Yaguo, ZHU Pengfei, et al. Numerical study on flow distribution characteristics of under-race lubrication oil passage[J]. Journal of Aerospace Power, 2025, 40（1）：20230255 doi: 10.13224/j.cnki.jasp.20230255
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In order to study the oil distribution characteristics of the under-race lubrication oil passage, the volume of fluid (VOF) method was used to calculate two-phase flow in the axis jet oil receiving scoop, and the formation process of oil film and the flow field characteristics in the passage were obtained. The effects of the oil temperature, shaft speed, oil volume flow rate, and aperture combination on the oil flow distribution were emphatically discussed, and the dimensionless correlation formula of the critical aperture ratio was established. The results showed that, the oil jet impinged on the center of the oil receiving scoop and formed an oil film, and the oil droplets and the oil belts formed by the broken film edge were thrown to the side wall, finally the oil film covered the entire end face. Within the calculation range of operating conditions, the distribution of lubricating oil was mainly affected by the oil volume flow rate and aperture. The flow rate at each outlet increased linearly with the increase of oil volume flow rate, and the oil distribution ratio decreased by an average of 15.05% with the increase of oil volume flow rate. The oil distribution ratio increased with the increase of downstream hole diameter and the aperture ratio. When the dimensionless oil supply flow was larger and the downstream dimensionless hole diameter was smaller, the critical aperture ratio was higher and approached to 1, when the dimensionless oil supply flow decreased or the downstream dimensionless hole diameter increased, the critical aperture ratio declined.
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