Table of Contents
ISRN Mechanical Engineering
Volume 2013, Article ID 128326, 12 pages
http://dx.doi.org/10.1155/2013/128326
Research Article

The Flow Simulation and Experimental Study of a Large Low-Head Mixed-Flow Pumping System

College of Water Resource & Energy Power Engineering, Yangzhou University, Jiangsu, China

Received 1 July 2013; Accepted 6 August 2013

Academic Editors: O. P. Gandhi and A. Szekrenyes

Copyright © 2013 Fan Yang and Chao Liu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A large low-head mixed-flow pumping system has been carried out based on numerical analysis of a three-dimensional viscous flow. For analysis, the Reynolds-averaged Navier-Stokes equations with a Shear stress transport turbulence model were discretized by finite-volume approximations. The result has shown that the flow in the double-helix volute passage is a spiral movement combining axial and rotary flows; the static pressure distribution in the volute is symmetric; the uniformity of axial velocity distribution and velocity-weighted average swirl angle at the outlet section is relatively low. The static pressure decreases gradually from the blade inlet to the exit on the pressure side, while increasing gradually on the suction side. The axial forces decrease gradually with the decrease of lifting head, and the radial forces decrease first and then increase. The pressure fluctuation at certain sections of the pumping system was measured from the model test. It is concluded that the pressure pulsations of impeller inlet and “” back wall of inlet passage are little influenced by operating condition. The domain frequency of the impeller inlet is approximately equal to the rotation frequency, while that of double-helix volute passage is multiple relations with the rotation frequency.