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| Hydraulic design and BVF diagnosis of high efficiency centrifugal pump |
(College of Mechanical and Transportation Engineering, China University of PetroleumBeijing, Beijing 102249, China) |
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Abstract In order to provide diagnostic evidence for optimizing design, the boundary vorticity flux (BVF) theory was introduced to diagnose blades, with the purpose of exploring the relationship between BVF distribution on blade surface and hydraulic performance. Based on twodimensional flow theory and velocity coefficient theory, applying the parameters of IS150-125-250 centrifugal pump, a centrifugalpump impeller was designed. And selfcompiled programs were used to complete the hydraulic design of the whole flow passage of the centrifugal pump. In comparison with the blade of reference, the space bending and twisting characteristics of the designed blade are more obvious. Applying RANS (Reynolds averaged N-S) equations with a standard k-ε twoequation turbulence model, numerical simulation of the inner flow field of the two pumps was carried out and a comparison and analysis of the data of numerical simulation of two centrifugal pumps, which was obtained from 13 working condition points, inclusive of the designed conditions, was made. With the numerical results of inner flow of the design pump and model pump, applying BVF diagnostic method, the BVF distribution of suction surface and pressure surface of two pumps was analyzed. The results show that, in comparison with the centrifugal pump of reference, the designed centrifugal pump has higher head and efficiency in the range of lower flow rate, and the maximum efficiency can be increased by 5.3%; the BVF distribution of the designed pump is more even and smooth, with smaller peak values, which indicates that the BVFbased flow field diagnosis can help restrain the unfavorable flow and effectively improve the hydraulic performance of the centrifugal pump.
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Received: 22 October 2012
Published: 25 June 2013
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