基于MPS法的船用减速器搅油功率损失仿真分析

Simulation Analysis of Oil Churning Power Loss of Marine Reducer Based on MPS Method

为研究船体横倾角对顺倒车工况下船用减速器润滑流场特性及搅油功率损失变化规律的影响,采用移动粒子半隐法(Moving Particle Semi-implicit Method,MPS)对8种工况下的船用减速器内部润滑流场进行数值仿真分析。仿真结果表明:同一转速、初始润滑油量和横倾角下,船用减速器在顺车工况下的润滑性能优于倒车工况下的润滑性能;顺车工况高速飞溅油液主要处于输出齿轮与传动齿轮啮合区,倒车工况高速飞溅油液主要处于溅起液面与输出齿轮周面相交位置。通过分析不同工况下初始液面上粒子数目的变化情况,发现横倾角为30°时箱内溅起润滑油粒子数最多,润滑效果最好;齿轮搅油功率损失随横倾角增大而增大,且在同一横倾角下船用减速器顺倒车工况的搅油功率损失波动幅度均趋于收敛,其均值大致相同。

To study the influence of heeling angles on the lubrication flow field characteristics and the variation law of the churning power loss of ship,based on the Moving Particle Semi-implicit method,the lubrication flow field characteristics of marine reducer of eight kinds of conditions were analyzed.The results show that,under same input shaft speeds,initial lubricating oil volume and heeling angles,the lubrication performance of the marine reducer is better in the moving forward condition than in the backward condition.The high-speed splashed oil in moving forward condition is mainly located in the meshing zone between the output gear and the transmission gears,while the high-speed splashed oil in the backward condition is mainly located at the intersection of the splashed surface and the circumferential surface of the output gear.By analyzing the variation of the number of particles on the initial liquid surface under different working conditions,it is found that the number of particles splashed in the gearbox is the largest and the lubrication effect is the best when the heeling angle is 30°.The oil churning power loss of the gear increases with the increase of the heave angle.At the same heeling angle,the fluctuation range of the oil churning power loss in the moving forward and in the backward conditions of the marine reducer tends to converge,and their mean values are roughly the same.