F316 A NUMERICAL ANALYSIS OF FLOW CHARACTERISTICS IN A DOUBLE SUCTION PUMP(Fluid machinary-3)

概要

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The characteristics of flow fields in a double suction pump at design and off-design points are investigated numerically. Because a double suction pump has two symmetric suction nozzles and flow paths, the sum of thrust load in suction lines may be zero and also flow field in each flow channel is ideally symmetric. In order to design a vane of an impeller, the single-arc method is adopted and the configuration of a volute is based on Archimedes spiral. Three-dimensional, steady, viscous governing equations are solved with finite volume method. Numerical analyses are conducted for whole regions including suction lines, impellers and a casing. These numerical regions are discretized by means of hexahedral elements. The standard κ-ε model is chosen as turbulence model. The static pressure and velocity distributions are calculated on whole regions. As flow rate reduces, the wake regions are enlarged. It is also seen that the flow field of each impeller in the double suction pump represents symmetric nature at design point. Comparisons for static pressure distributions on the suction and pressure surfaces of an impeller vane are prepared. In addition, characteristics of the secondary flow in the volute are analyzed at design and off-design points. Numerical results show that several asymmetric flow cells are formed at off-design point. Meanwhile, two symmetric flow cells are found at design point.
一般社団法人日本機械学会の論文
2000-10-01