La Houille Blanche
Number 3-4, Juin 1998
|Page(s)||38 - 44|
|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
Conservatoire National des Arts et Métiers, Paris
2 C.E.T.I.M., Nantes
3 GEC Alsthom, ACB, Bergeron
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
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