| Citation: | Gai Zepeng, Qin Jingwen, Jiang Huiqing, et al. Flow and flow-rate distribution characteristics of axial under-race lubrication with oil dam structure[J]. Journal of Aerospace Power, 2026, 41（X）：20250427 doi: 10.13224/j.cnki.jasp.20250427
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To study the design approaches for enhancing lubrication effect of aero-engine lubrication system and achieving precise, on-demand lubrication at multiple locations, an axial under-race lubrication structure with oil dam was presented. Numerical study was conducted on the internal oil-gas two-phase flow process and oil flow-rate distribution characteristics. Based on verifying the accuracy of the numerical methods, the influences of oil flow-rate, rotational speed, oil temperature, and the circumferential angle of oil dam on the oil flow-rate and distribution ratio of the lubricated spline and bearing were analyzed, and the mechanism of the factors was also revealed. The results indicated that the oil formed a continuous film with marked phase-separated flow characteristics under rotational centrifugation, and was delivered to the bearing and spline after being segregated by the oil dam. The relative deviation between the lubrication flow-rate of spline and bearing and the circumferential angle ratio of oil dam under different conditions remained within 6%, showing good consistency. The larger circumferential angle ratio of oil dam indicated the more oil trapped in the oil collection chamber during the initial state, resulting in reduced outlet flow-rate. The outlet flow-rate varied approximately linearly with the circumferential angle ratio of oil dam during the steady state, with a maximum deviation of 4.72%. Relevant studies validated the effectiveness of controlling flow-rate distribution by adjusting the circumferential angle of oil dam under varying conditions, achieving precise lubrication requirements for both bearing and spline as needed.
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