基于螺旋槽动压气体止推轴承的承载原理,利用台阶流原理,为了进一步优化轴承特性,增加轴承的承载力和支撑刚度。本文改进了两种凸、凹槽型结构与平底螺旋槽动压气体止推轴承进行比较,通过采用CFD软件对计算区域进行了数值模拟,用理想空气作为试验气体,分析比较了三种不同槽底气体轴承的气膜压力、径向速度、气膜切向力、承载力、摩擦阻力与摩擦功耗,结果显示了凸型槽底的轴承的承载力随着转速的提升增大程度要大于其他两种槽型,摩擦力、摩擦系数与摩擦功耗也远大于其他两种槽型。
关键词:槽型;气膜;压力;径向速度;承载力;摩擦力;摩擦功耗
Abstract
Based on the bearing principle of spiral groove dynamic pressure gas thrust bearing, in order to further optimize the bearing characteristics and increase the bearing capacity and support stiffness by using the principle of step flow, this paper improved two convex and groove structures and compared them with the flat-bottomed spiral groove dynamic pressure gas thrust bearing, and numerically simulated the calculation area by CFD software, using ideal air as the test gas. The gas film pressure, radial velocity, tangential force of gas film, bearing capacity, friction resistance and friction power consumption of three kinds of gas bearings with different groove bottoms are compared. The results show that the bearing capacity of convex groove bottoms increases more than the other two groove types with the increase of rotating speed, and the friction force, friction coefficient and friction power consumption are much larger than the other two groove types.
Key words: Trough type; Gas film; Pressure; Radial velocity; Bearing capacity; Frictional force; Friction power consumption
关键词
槽型 /
气膜 /
压力 /
径向速度 /
承载力 /
摩擦力 /
摩擦功耗
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Key words
Trough type /
Gas film /
Pressure /
Radial velocity /
Bearing capacity /
Frictional force /
Friction power consumption
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