Influence of Support Shapes on the Efficiency of Bulb Tubular Pumps

摘要

With the characteristics of high efficiency, small hydraulic loss, compact unit structure, simple construction arrangement and low cost both for construction and operation, bulb tubular pumps are especially suitable for large discharge and low lift head pumping stations of the east route of South to North Water Diversion Project in China. It is important to analyze the flow characteristics and performance of bulb tubular pumps. The flow inside the flow-passage components is threedimensional incompressible turbulence flow. Bulb support unit which including manhole and bottoM support is an important flow-passage component of bulb tubular pumps. In this paper CFD method is used to simulate a bulb tubular pump with different support shapes. Based on the RNG k-ε turbulent model with Wall-Function Law, the SIMPLEC algorithm is applied for the solution of the discretizaton governing equations. The results of the calculation indicate that the shape of support has affected total hydraulic losses of the pump and it also obvious influence on flow pattern. Reasonable support shapes not only improve the turbulent flow, but also reduce circumference velocity.