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An isoviscous, isothermal model investigating the influence of hydrostatic recesses on a spring-supported tilting pad thrust bearing

机译:等静压等温模型,研究静液压凹槽对弹簧支撑的可倾瓦止推轴承的影响

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摘要

Tilting-pad hydrodynamic thrust bearings are used in hydroelectric power stations around the world, reliably supporting turbines weighing hundreds of tonnes, over decades of service. Newer designs incorporate hydrostatic recesses machined into the sector-shaped pads to enhance oil film thickness at low rotational speeds. External pressurisation practically eliminates wear and enhances service life and reliability. It follows that older generating plants, lacking such assistance, stand to benefit from being retrofitted with hydrostatic lubrication systems. The design process is not trivial however. The need to increase the groove size to permit spontaneous lifting of the turbine under hydrostatic pressure, conflicts with the need to preserve performance of the original plane pad design. A haphazardly designed recess can induce a significant rise in bearing temperature concomitant with reduced mechanical efficiency and risk of thermal damage. In this work, a numerical study of a sector-shaped pad is undertaken to demonstrate how recess size and shape can affect the performance of a typical bearing.
机译:倾翻式水力推力轴承在世界各地的水力发电站中得到使用,可在数十年的使用中可靠地支撑重达数百吨的涡轮机。较新的设计包括在扇形垫中加工的静液压凹槽,以在低转速下增加油膜厚度。外部加压实际上消除了磨损,并延长了使用寿命和可靠性。随之而来的是,缺少此类帮助的老式发电厂将受益于液压静压润滑系统的改造。但是,设计过程并不简单。需要增加凹槽尺寸以允许在静水压力下自发地抬起涡轮机,这与保持原始平面垫设计的性能的需求相冲突。随意设计的凹槽会导致轴承温度显着升高,同时降低机械效率和热损坏风险。在这项工作中,对扇形垫进行了数值研究,以证明凹槽尺寸和形状如何影响典型轴承的性能。

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