Influence of Installation Deviation of the Generator Lower Guide Bearing on Oil Film Flow Characteristics of Hydropower Unit
Hydroelectric units play a crucial role in achieving Carbon Peaking and Carbon Neutrality Goals.The lower guide bearing is an important component of the hydroelectric unit's shaft system,supporting and restraining the main shaft,and playing a significant role during the operation of the generator.In this study,a three-dimensional model of the lower guide bearing considering the spray system is established,and the influence of oil film lubrication performance and installation deviation on bearing load is studied.It is found that although the spray system reduces oil agitation in the tank,the lubricating oil flow between the bearing pads is chaotic.The main losses are caused by the disorderly flow between the pads.For the deviation model of the pads offset radially,the oil film pressure and temperature increase as the pads move inward radially.For the deviation model of the pads offset to one side,the pressure and temperature have an asymmetrical distribution as the pads move in the positive x-axis direction,and the maximum pressure and highest temperature on the pad surface increase with the deviation,as well as the unbalanced radial force.Therefore,during the installation process of the lower guide bearing,attention should be paid to the concentricity between the pad distribution circle and the main shaft.This research is of great significance for improving the operational quality of hydro-turbines,reducing operation costs and enhancing the efficiency of hydroelectric power stations,ensuring the stable and safe operation of millions of hydroelectric units.
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