A Study on Unstable S-Shape Characteristic Curves of Pump Turbines at No-Flow

[+] Author and Article Information
Y. Senoo, M. Yamaguchi

Research Institute of Industrial Science, Kyushu University, Kasugashi, Fukuoka 816, Japan

J. Turbomach 109(1), 77-82 (Jan 01, 1987) (6 pages) doi:10.1115/1.3262073 History: Received December 26, 1985; Online November 09, 2009


A small model of a Francis-type pump turbine was tested without the rotating shroud and the radial distribution of pressure in the rotor was measured using pressure taps on the stationary shroud. The mean tangential velocity component in the rotor was measured with a laser velocimeter, and the flow pattern was visualized using a camera which rotated with the rotor. Comparing data at the no-flow condition in the turbine mode with those in the pump mode, the effect of semi-open spaces at the inlet and at the exit of blade rows on the difference of pressure rise between the two modes was recognized, and the flow patterns and the distributions of tangential velocity component in these zones were utilized to understand the phenomena. Furthermore, some discussion is included on the relationship between the design head coefficient in the turbine mode and the S-shape characteristics.

Copyright © 1987 by ASME
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