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Rotating instabilities in a radial vaneless diffuser. Part I : High Speed stereoscopic PIV measurements

type de publication      communication internationale avec actes publiés
date de publication 2009
auteur(s) Dazin Antoine; Cavazzini Giovanna; Pavesi Giogio; Dupont Patrick; Coudert Sébastien; Ardizzon Guido; Caignaert Guy; Bois Gérard
  
conférence 8th European Conference on Turbomachinery
     dates de 23-03-2009 à 27-03-2009
     lieu Graz (Autriche)
     nom des actes Euroturbo 8- Conference Proceedings995
  
pages 995 – 1004
résumé The paper refers to the behaviour of a vaneless diffuser of a radial flow pump in partial flow operating conditions. Experimental data have been obtained within the diffuser using 2D/3C high repetition rate PIV coupled with unsteady pressure transducers. The pressure measurements were acquired on the shroud wall of the vaneless diffuser and on the suction pipe of the pump. Various operating conditions were investigated in order to characterize the unsteady flow field especially at partial flow rates when the rotating instability appears. A Fourier analysis has been carried out both on the pressure and velocity signals to identify the characteristics of the rotating instability. Averaged results of the PIV data allowed visualizing and describing the topology of the instability cells.
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