On the basis of the computational fluid dynamics (CFD) method, this study calculates the surface convective heat transfer coefficients of the sun gear, planetary gear, ring gear, and bearing before and after the opening of the planetary gear of a fan-driven gearbox. A numerical fitting method is used to establish the calculation model of the convective heat transfer coefficients of the sun gear, planetary gear, ring gear, and bearing under the open-hole oil-return condition. The convective heat transfer coefficients of each element are compared before and after the hole is bored, and the design method for the gearbox parameters with the objective of heat transfer performance is proposed. Result shows that the convective heat transfer coefficients of each element are increased after oil is returned from the hole of the planetary gear, and the change rate of the convective heat transfer coefficient of the raceway in the planetary gear bearing is the highest. When the aperture of the planetary gear is 7 mm and the number of holes is four, the heat transfer performance of the gearbox is the best. The maximum error between the convection heat transfer coefficient fitting formula value and the CFD simulation calculation result is 1.0558 %.

本研究基于计算流体动力学（CFD）方法，计算了风扇传动齿轮箱行星齿轮打开前后太阳轮、行星齿轮、齿圈和轴承的表面对流传热系数。 . 采用数值拟合方法建立了开孔回油条件下太阳轮、行星轮、齿圈和轴承的对流传热系数计算模型。对比钻孔前后各元件的对流传热系数，提出以传热性能为目标的齿轮箱参数设计方法。结果表明，行星齿轮孔回油后各元件的对流传热系数增加，行星齿轮轴承内滚道的对流传热系数变化率最高。当行星齿轮的孔径为7mm，孔数为4个时，齿轮箱的传热性能最好。对流传热系数拟合公式值与CFD模拟计算结果的最大误差为1.0558%。