直升机中间减速器在飞溅润滑下运转,轴承若因润滑不充分或磨损产生金属屑末,其能否被机匣底部的金属屑末信号器吸附报警直接关系到直升机的飞行安全.为此,本文基于CFD仿真分析方法,应用RNG k-ɛ湍流模型及动网格技术,采用流体体积法-离散相模型(Volume of fluid-discrete phase model,VOF-DPM)耦合模型,分析金属屑末可达性的影响因素,并对机匣结构开展优化研究.结果表明:齿轮转速在6 000 r/min或浸油深度在24 mm时,金属屑末可达性最佳;金属屑末的密度与其可达性呈非线性关系,粒径在未发生数量级变化的前提下对其可达性影响较小.
Research on Accessibility Factors of Metal Particles and Structural Optimization of Intermediate Gearbox in a Helicopter
The intermediate gearbox of a helicopter operates under splash lubrication.If the bearing produces metal particles due to insufficient lubrication or wear,whether it can be adsorbed by the metal particles signal at the bottom of the gearbox and alarm directly affects the flight safety of the helicopter.Based on the CFD method,the factors affecting the accessibility of metal particles are analyzed by using the volume of fluid-discrete phase model(VOF-DPM)coupling model,the RNG k-ɛ turbulence model and the dynamic grid technology.Furthermore,the optimization research on the casing structure is conducted.Experimental results show that the accessibility of metal particles is optimal when the gear speed is 6 000 rad/min or the immersion depth is 24 mm.The density of metal particles exhibits a nonlinear relationship with their accessibility,and the particle size has a relatively small impact on their accessibility without an order of magnitude change.
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