加拿大国际涡轮技术会议与展览会

沃科夏轴承将出席加拿大国际涡轮技术会议与展览会线上会议

“带聚合物轴衬轴瓦的大型重负载可倾瓦径向轴承的实验调查和数值建模”

作者

  • Filippo Cangioli,沃科夏轴承(主讲作者)
  • Richard Livermore-Hardy,沃科夏轴承
  • Guy Pethybridge,,沃科夏轴承
  • Uemit Mermertas,Siemens Gas and Power GmbH & Co. KG
  • Michael Stottrop,Ruhr-Universitat Bochum
  • Beate Bender,Ruhr-Universitat Bochum

演讲时间表

会议 25-01
开始时间:2020 年 9 月 22 日上午 10:15

摘要

带有 “PEEK” 聚合物轴衬轴瓦的大型可倾瓦径向 (TPJ) 轴承在一系列工作条件下进行了测试,这些条件代表着石化发电厂中使用的涡轮发电机遇到的那些工作条件。 直径为 500 mm 的测试轴承具有四个偏心支撑轴瓦、滚珠和球窝枢轴、枢轴配置之间的负载、“定向润滑”和流体静力顶升功能。 这些测试对轴表面速度范围在 40 m/s 与 95 m/s 之间、最大特定负载为 4.75 MPa 时轴承的静态和动态行为进行了特征描述。 先前在带白合金轴衬轴瓦的相同轴承上调查了类似的测试条件,从而可实现直接比较。

本论文介绍了带聚合物轴衬轴瓦的可倾瓦径向轴承的热弹塑性流体动力 (TEHD) 模型,并且对照实验测试数据对该模型进行了验证。

实验数据以及数值结果揭示并证实,在高特定负载下使用带聚合物轴衬轴瓦的可倾瓦径向轴承可实现出色的性能。

在加拿大国际涡轮技术会议与展览会网站上阅读有关该论文的更多信息

会议登记

有关加拿大国际涡轮技术会议与展览会线上会议登记详细信息,请在线访问 美国机械工程师学会网站

线上活动内容将在线上会议日期之前、之中和之后大约一周时间按需提供。

Waukesha Bearings Co-authors Paper with Ansaldo Energia for 62nd ASME Turbo Expo

“A System Integration Approach for Heavy-Duty Gas Turbine Upgrades Using Improved Rotor Thrust Predictions and Application of Advanced Thrust Bearing Designs,” a joint paper by Ansaldo Energia and Waukesha Bearings, will be presented at the ASME Turbo Expo in Charlotte, North Carolina, Wednesday, June 28 at 8 am (Session 15-1, in room 207D).

Authors

Francesco Bavassano, Ansaldo Energia; Marco Mantero, Ansaldo Energia; Riccardo Traverso, Ansaldo Energia; Richard Livermore-Hardy, Waukesha Bearings; Barry Blair, Waukesha Bearings

Abstract

The progressive upgrading of heavy-duty gas turbines, aimed at increased performance, can ultimately introduce more onerous operating conditions, to the point that original design limits can be approached.

An increased gas turbine pressure ratio together with compression and expansion line adjustments can directly affect the rotor axial thrust. Other than the individual forces acting on the rotor, a key component to be taken into account is the fluid film thrust bearing, which should assure safe and reliable operation during the worst case operating conditions.

Typically, such bearings are designed with large safety margins, yet it is possible that the new and more challenging conditions require a bearing capability upgrade, especially when field retrofit needs pose additional constraints.

A succession of performance upgrades have been carried out on Ansaldo Energia’s AE94.2 E-Class GT. An accurate understanding of the thrust-related phenomena proved necessary and drove improvements in the thrust bearing design along with hardware adjustments to lower the rotor thrust.

This paper addresses calculations and experimental arrangements for the rotor axial thrust evaluation on the aforementioned GT and considers both the matters related to the secondary air system for the thrust generation and the mechanical/functional matters for the bearing upgrade. It is shown that issues such as uneven load sharing across the thrust bearing, or the variability of rotor thrust from engine to engine within the fleet, strongly affect the maximum thrust assessment and thus the requirements used in the process of selecting a suitable bearing.

A predictive calculation method is described considering the main thrust contributions. Field experimental setups and main observations are reported. Measurements have been carried out using thermocouples and load cells placed on many of the thrust bearing pads. Moreover, the engine cavities carrying the highest and/or the most uncertain thrust share have been instrumented and characterized by pressure sensors.

The development of an upgraded thrust bearing is finally depicted through the main issues addressed, such as improved thrust pad lining material, increased load sharing efficiency and enlarged thrust bearing active surface area. Waukesha Bearings test results on the upgraded lining material, a high-tin aluminium alloy, are reported as well.

A multidisciplinary approach is presented as necessary to manage the crucial challenge of improving the thrust balancing system, especially in the case of a formerly designed engine which receives a powerful upgrade.

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