To study the influence of dynamic flight attitudes on the splash lubrication performance and churning power losses of the intermediate spiral bevel gearbox in a helicopter, a three-dimensional (3D) simulation model consisting of a spiral bevel gear pair, two bearing caps with oil guide holes and the housing is established, and CFD (Computational Fluid Dynamics) simulations with main flight attitudes are performed. The influences of turning directions, rotational speeds, circling attitude and accelerations on the distribution of lubricating oil, the flow rate of oil guide holes and churning power losses are discussed. A test rig for studying the splash lubrication performance of a gearbox under different dynamic attitudes is developed, and the feasibility of the present simulation method is validated by experiments.

为了研究动态飞行姿态对直升机中级螺旋锥齿轮减速机飞溅润滑性能和搅拌功率损失的影响，建立了一个三维（3D）仿真模型，该模型由一对螺旋锥齿轮，两个带机油盖的轴承盖组成孔并建立外壳，并执行具有主要飞行姿态的CFD（计算流体动力学）模拟。讨论了转弯方向，转速，旋转姿态和加速度对润滑油分布，导油孔流量和搅拌功率损耗的影响。开发了一种用于研究齿轮箱在不同动态姿态下飞溅润滑性能的试验装置，并通过实验验证了该仿真方法的可行性。