Original scientific paper

Rotating Stall Region of Water-Jet Pump

Cheng Li ; School of Hydraulic, Energy, and power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China
Qi Weijun ; School of Hydraulic, Energy, and power Engineering, Yangzhou University, Yangzhou, Jiangsu, P.R. China

Abstract

There is a rotating stall region, which is the so-called unstable head curve when water jet is operated. This region should be usually avoided because of the risk of instabilities during the pump starting and operation. Experimental and numerical research on the relation between the instability in the head curve and the magnitude of unsteady hydraulic forces are presented. It is found that the rotating stall region is strongly influenced by the clearance gap between the impeller blades and the casing. The head increases over the entire range of flow rates when the tip clearance is reduced. The spectral content of the forces shows evidence of rotating instabilities. It is indicated that the instability of the head curve and unsteady forces are interrelated, and that rotating instabilities play a role in this unstable operation region.

Keywords

water-jet pump; unstable; rotating stall; numerical simulation

Hrčak ID:

125665

URI

https://hrcak.srce.hr/125665

Publication date:

29.7.2014.

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