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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >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：圆形动力，热和推力和推力负荷性能轴承试验台和倾斜垫轴颈轴承的测试结果和螺旋槽推力轴承

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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 turboexpander. The radial bearings 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 were a spiral groove type with axial compliance features. The thrust bearing accounts for over 90% of the combined bearing power consumption, which has a cubic relationship with speed and increases with case pressure. Radial bearing circumferential pad temperature gradients 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 thrust bearing showed a significant increase in temperature with higher case pressure. The thrust bearings 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 thrust bearing thermal behavior and to improve the thrust bearing design. Finally, the radial bearings 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，以表征用于为无油涡轮机开发的气体轴承的旋转动力，热和推力负荷性能。本文中测试的径向轴承是倾斜垫轴颈轴承，径向顺应性特征允许轴承孔增加以适应轴生长，并且止推轴承是具有轴向合规性的螺旋槽型。推力轴承占合并轴承功耗的90％以上，其与速度的立方关系并随着情况而增加。径向轴承圆周焊盘温度梯度随着第四或第五功率的速度大致增加，温度较高，用于小写压力。最大稳态轴承垫温度随着类似的冷却质量流量的增加而增加;然而，只有推力轴承显示出具有更高壳体的温度显着增加。推力轴承在所有速度下稳定，但是发现负载能力低于预期，显然是由于定子中径向温度梯度引起的焊盘变形。已经提出了更先进的建模方法以更好地理解推力轴承的热行为，并改善推力轴承设计。最后，测试所测试的径向轴承是稳定的130 krpm的设计速度，这代表了在文献中测试的倾斜垫气体轴承的最高表面速度。

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