| Issue |
La Houille Blanche
Number 3-4, Juin 1998
|
|
|---|---|---|
| Page(s) | 38 - 44 | |
| DOI | https://doi.org/10.1051/lhb/1998035 | |
| Published online | 01 August 2009 | |
Influence des diffuseurs aubés sur le fonctionnement des pompes centrifuges
The influence of bladed diffusers on a centrifugal pump working
1
Conservatoire National des Arts et Métiers, Paris
2
C.E.T.I.M., Nantes
3
GEC Alsthom, ACB, Bergeron
Abstract
Flow inside centrifugal turbomachines is always turbulent and presents unsteady flow characteristics due to the interaction between fixed and rotating parts. Moreover, during off-peak running, the flow angle/blade profile mismatch causes large local speed fluctuations which accentuate and amplify turbulence and unsteady flow levels particularly in rotor-stator interaction zones. Measurements of typical turbulence parameters within the rotor are only possible by means of such techniques as the laser velocimeter. A comparative analysis of flow in two pump scale models is presented in this paper. Each pump comprises both a smooth and bladed nozzle, and averaged and fluctuating speed vector and turbulence values are presented and analysed.
© Société Hydrotechnique de France, 1998