Numerical simulation and experiment of integrated oil circulating pump for 300 MW shaft seals type RCP
Feng Xiaodong1, Cai Long1, Wu Dazhuan2, Yang Lifeng1, L? Xiangping1
1.Harbin Electric Power Equipment Co. Ltd., Harbin Electric Corporation, Harbin, Heilongjiang 150066, China; 2.Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China
Abstract:The structure features of axial-flow helix impeller of an integrated oil circulating pump for 300MW shaft seals type RCP and the pump hydraulic characteristics are studied. The three dimensio-nal flow of oil in the hydraulic components is numerically simulated, and the pump performance is predicted and the rationality of design parameters chosen for the impeller and guide vane is verified. The pump hydraulic performance is measured under different operating conditions and the influence of oil temperature on the performance and its mechanism are analyzed based on the numerical and experimental results. The results show that the numerical results agree well with the experimental data at high flow rates. Even though the pump is subject to an excellent cavitation performance and a high reliability, its efficiency is as low as about 10% only. With the increasing temperature, the lubricant viscosity gets small, accordingly the impeller disk friction loss and the skin friction loss across the impeller and guide vane are decreased; eventually, the pump head and efficiency are improved. The results indicate that the pump hydraulic performance can meet the operational requirement by the thrust bearing lubricant system, and provide an important reference for analysis and design of a lubricant circulating system.
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