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汽轮机可倾瓦轴承油膜特性研究
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    摘要:

    为了研究汽轮机可倾瓦轴承的油膜特性,采用Pro/E建模和ANSYS模拟,选用计算三维模型的湍流SST模型,考虑到瓦块间隙及瓦块相互之间的影响,分析并比较不同瓦数可倾瓦轴承油膜流场的变化,得到可倾瓦油膜特性规律:对于某个瓦块,每个瓦块上的油膜形成一个正压极值中心,且随着瓦块数增加,极值中心向轴瓦支点处偏移,使瓦块上形成两个压力极值。瓦块温度分布较平稳,油膜出口处温升较大;随着可倾瓦瓦块数增加,油膜压力峰值逐渐减小且瓦块之间的油膜压力峰值差减小并趋于平稳,不同轴瓦间油膜温度变化较小。润滑油温升对油膜影响较大,汽轮机运行中可倾瓦四瓦轴承比较稳定,但应严格控制润滑油温升。

    Abstract:

    In order to discuss oil film characteristics of steam turbine tilting pad bearing,using Pro/E to model and ANSYS to simulate,and selecting SST turbulence model of 3D model, the changes of different oil film flow field of tilting pad were studied by considering the influence of pad space and between pads. The results show that, for a pad,the oil film in each pad forms a positive pressure extremum center. Along with the increasing of pad number,extreme center offsets to supporting point of the pads,which makes two extreme pressure formed on the pads. Pads temperature distribution is more smooth,and the temperature rise of oil film exit is larger. As the number of tilting pads increasing,the peak value of oil film pressure is decreased gradually,the difference of the peak value of oil film pressure is also decreased and then flattens out. Oil film temperature variation is smaller between the different bearing pads. Temperature rise of lubricating oil has a greater influence on the oil film. Four watts of tilting pad bearing in the operation of the steam turbine is relatively stable,but the oil temperature rise must be strictly controlled.

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张艾萍,李刚,党翠,司迎迎,曹康琪越.汽轮机可倾瓦轴承油膜特性研究[J].润滑与密封,2014,39(4):44-48.
.[J]. Lubrication Engineering,2014,39(4):44-48.

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  • 在线发布日期: 2014-11-25
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