Based on computational fluid dynamics, a two-phase flow model was established to calculate the churning power loss of the spiral bevel gears under splash lubrication. The error between the simulation results and experiment results is only 7.04%. Taking a certain helicopter as an example, the churning power loss of the intermediate gearbox is ∼2.6051 kW, accounting for ∼1.93% of the input power. Besides, the motion mechanisms of free flow, ejection flow and splashing flow of the spiral bevel gear were investigated. The influences of the rotational speed and oil immersion depth on the churning power loss were analysed. The rotational speed and oil immersion depth of the intermediate gearbox should be in the range of 3000–5000 r/min and 17–26 mm, respectively, which can ensure sufficient lubrication and low churning power loss.

基于计算流体动力学，建立了两相流模型来计算飞溅润滑下螺旋锥齿轮的搅拌功率损耗。仿真结果与实验结果之间的误差仅为7.04％。以某架直升飞机为例，中间齿轮箱的搅动功率损耗为〜2.6051 kW，约占输入功率的1.93％。此外，还研究了螺旋锥齿轮的自由流动，喷射流动和飞溅流动的运动机理。分析了转速和油浸深度对搅拌功率损失的影响。中间齿轮箱的转速和油浸深度应分别在3000–5000 r / min和17–26 mm的范围内，这可以确保足够的润滑和较低的搅拌动力损失。