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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >A Rotordynamic, Thermal, and Thrust Load Performance Gas Bearing Test Rig and Test Results for Tilting Pad Journal Bearings and Spiral Groove Thrust Bearings
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A Rotordynamic, Thermal, and Thrust Load Performance Gas Bearing Test Rig and Test Results for Tilting Pad Journal Bearings and Spiral Groove Thrust Bearings

机译：倾斜垫轴颈轴承和螺旋槽推力轴承的转子动力，热力和推力载荷性能气体轴承试验台和试验结果

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摘要

A high-speed gas bearing test rig was developed to characterize rotordynamic, thermal, and thrust load performance of gas bearings being developed for an oil-free turboex-pander. The radial bearings (RBs) tested in this paper were tilting pad journal bearings with radial compliance features that allow the bearing bore to increase to accommodate shaft growth, and the thrust bearings (TBs) were a spiral groove type with axial compliance features. The TB accounts for over 90% of the combined bearing power consumption, which has a cubic relationship with speed and increases with case pressure. RB circumferential pad temperatures increased approximately with speed to the fourth or fifth power, with slightly higher temperature rise for lower case pressure. Maximum steady-state bearing pad temperatures increase with increasing speed for similar cooling mass flow rates; however, only the TB showed a significant increase in temperature with higher case pressure. The TBs were stable at all speeds, but the load capacity was found to be lower than anticipated, apparently due to pad deformations caused by radial temperature gradients in the stator. More advanced modeling approaches have been proposed to better understand the TB thermal behavior and to improve the TB design. Finally, the RBs tested were demonstrated to be stable up to the design speed of 130 krpm, which represents the highest surface speed for tilting pad gas bearings tested in the literature.
机译：开发了一种高速气体轴承试验台，以表征为无油涡轮增压器开发的气体轴承的转子动力，热力和推力载荷性能。本文中测试的径向轴承（RBs）是具有径向柔度特征的可倾瓦轴颈轴承，其允许轴承孔增加以适应轴的增长，而推力轴承（TBs）是具有轴向柔度特征的螺旋槽型。 TB占轴承总能耗的90％以上，与速度呈三次方关系，并随壳体压力而增加。 RB圆周垫的温度大约随速度增加而升至四次方或五次方，而对于较低的外壳压力，温升略高。在类似的冷却质量流量下，最大稳态轴承瓦的温度会随着速度的增加而增加。然而，只有结核菌在较高的病历压力下才表现出明显的温度升高。 TB在所有速度下都是稳定的，但发现负载能力比预期的要低，这显然是由于定子中径向温度梯度引起的轴瓦变形所致。已经提出了更高级的建模方法，以更好地了解结核病的热行为并改善结核病的设计。最终，证明所测试的RB在高达130 krpm的设计速度下是稳定的，这代表了文献中所测试的可倾瓦斯气垫轴承的最高表面速度。

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