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本文基于Mixture模型,以油雾-空气混合物为研究对象,运用Fluent软件数值计算重载机车齿轮箱径向迷宫密封的内部流场和泄漏量,研究径向迷宫的密封机理,分析节流齿啮合深度对密封性能的影响,对比研究不同的油雾参数(油雾颗粒直径、体积分数)和密封结构参数(径向间隙、节流齿厚度)对介质高速通道的形成和迷宫密封性能的影响规律。研究结果表明;径向迷宫密封在节流齿相对啮合深度为0.5时形成与迷宫结构相适应的介质高速通道,径向间隙和节流齿厚度对介质高速通道的形成无影响,介质高速通道的形成仅取决于空腔宽度(即节流齿相对啮合深度),最佳相对啮合深度为0。径向间隙增大、节流齿厚度减小,高速通道效果更明显。随着油雾颗粒直径或径向间隙的增大,油雾体积分数或节流齿厚度的减小,迷宫泄漏量增加,密封性能减弱。
Based on the Mixture model, the oil mist-air mixture is taken as the research object. The internal flow field and leakage of the radial labyrinth seal of heavy-duty locomotive gearbox are calculated by Fluent software. The sealing mechanism of radial labyrinth is analyzed. Depth on the sealing performance, comparative study of different oil mist parameters (oil mist particle diameter, volume fraction) and the sealing structure parameters (radial clearance, throttle thickness) on the formation of medium velocity labyrinth and labyrinth sealing performance of the law . The results show that the radial labyrinth seal forms a medium high-speed channel corresponding to the labyrinth structure when the relative engagement depth of the throttle tooth is 0.5, and the radial clearance and the thickness of the throttle tooth have no effect on the formation of the medium high-speed channel. The formation depends only on the width of the cavity (ie, the relative depth of engagement of the throttle teeth) and the optimum relative engagement depth is zero. Radial clearance increases, reducing the thickness of throttle teeth, high-speed channel effect is more obvious. With the increase of oil mist particle diameter or radial clearance, the volume fraction of oil mist or the reduction of the thickness of the throttle tooth, the amount of labyrinth leakage increases and the sealing performance decreases.