摘要
在我国大型水轮机组中,流体支承可倾瓦滑动轴承由于有更优的减振性能和承载能力,已广泛应用于水力机械中。为了探究其在实际工程中的承载性能,本文首先介绍其动力润滑原理,根据Reynolds方程及内-外层油膜流量平衡方程、Walther“黏-温”方程,建立了流体支承可倾瓦的油膜压力分布计算模型,基于MATLAB编程数值求解,结果表明内层动压油膜呈“双峰型”分布,静压层油膜在静压腔内为定值,并且在试验的各工况下轴瓦处于单侧浮动状态。对内径125 mm的三瓦流体支承可倾瓦滑动轴承研制了倒置式轴承试验台,并在不同工况下进行了油膜压力的测试,结果表明相比于外载荷,转速对轴承承载性能的影响更明显,在设计轴承时应优先考虑转速的影响。当轴承在较高转速工作时,油膜呈现较大的刚度,具有良好的承载性能,能满足水轮机组的使用性能要求。研究结果为流体支承可倾瓦滑动轴承的性能分析和优化设计提供一定的参考依据。
The fluid pivot tilting pad journal bearing has been widely used in hydraulic turbine units because of its good vibration damping performance and large bearing capacity. To examine its bearing capacity, this paper first discusses its basic dynamic lubrication mechanism, and constructs a new method of oil film pressure distribution for the bearing, using the Reynolds equation, flow balance equation between the inner and the outer oil film, and the Walther equation. The calculation results show that the hydrodynamic pressure oil film follows a bimodal distribution, while the hydrostatic film is steady in the pressure tap;the bottom pad is in a one-sided floating state under the test conditions. Then, we design and build a bearing test stand of inverted type, test the three-tilting pad bearing with an inner diameter of 125mm, and measure the oil film pressure under different rotational speeds and load conditions. The results show that rotational speed is the first factor of bearing capacity to consider in bearing design.Under higher rotational speeds, the oil film shows higher stiffness and better bearing capacity.Therefore,it can be widely applied to hydraulic turbine units.
作者
毛明
陈建能
徐高欢
谢荣盛
夏旭东
许永利
MAO Ming;CHEN Jianneng;XU Gaohuan;XIE Rongsheng;XIA Xudong;XU Yongli(Faculty of Mechanical Engineering and Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China;College of Mechanical and Automotive Engineering,Zhejiang University of Water Resources and Electric Power,Hangzhou 310018,China;Zhejiang Shenfa Bearing Co Ltd.,Shaoxing 311800,China)
出处
《水力发电学报》
CSCD
北大核心
2023年第2期105-115,共11页
Journal of Hydroelectric Engineering
基金
浙江省重点研发计划(2021C01158)
浙江省自然科学基金项目(Y21E050017)。
关键词
水轮机
流体支承
可倾瓦滑动轴承
承载性能
试验研究
压力分布
hydraulic turbine
fluid pivot
tilting pad journal bearing
bearing capacity
experimental research
oil film pressure distribution
