Experimental Study of the Flow in the Suction Pipe of a Centrifugal Pump at Partial Flow Rates in Unsteady Conditions

Author:

Bolpaire S.1,Barrand J. P.1

Affiliation:

1. Laboratoire de Me´canique de Lille, ENSAM—8 bd Louis XIV, F-59046 Lille Cedex, France

Abstract

The operational range and the performances of pumps are limited by the occurrence of backflow and prerotation in the suction pipe as the flow rate is reduced. This paper presents the study of static pressure measurements and visualizations in the suction pipe, near the inlet of a centrifugal pump, at partial flow rates, in steady conditions, and during a fast start-up of the pump. The tests were carried out in water on the DERAP© test loop of the ENSAM Lille laboratory. Standard methods allowed to determine the recirculation critical flow rate. A visualization method showed that the axial extent of the recirculation and the prerotation with the flow rate is considerably reduced during a fast start-up compared to steady conditions.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference11 articles.

1. Barrand, J. P., Caignaert, G., Graeser, J. E., and Rieutord, E., 1985, “Synthe`se de re´sultats d’essais en air et en eau en vue de la de´tection des de´bits critiques de recirculation a` l’entre´e et a` la sortie de la roue d’une pompe centrifuge,” La Houille Blanche, No. 5, pp. 406–420

2. Barrand, J. P., Ghelici, N., and Caignaert, G., 1993, “Unsteady Flow During Fast Start Up of a Centrifugal Pump,” ASME FED-Vol. 154, Pumping Machinery, pp. 143–150.

3. Barrand, J. P., and Picavet, A., 1996, “Qualitative Flow Visualizations During Fast Start Up of Centrifugal Pumps,” Proceedings, XVIII IAHR Symposium on Hydraulic Machinery and Cavitation, Group 5, Vol. II, pp. 671–675.

4. Caignaert, G., and Canavelis, 1986, “Recensement et examen critique des me´thodes expe´rimentales de de´tection des recirculations dans une pompe centrifugre,” IAHR Symposium, Montre´al, Quebec, Canada, Question 45, pp. 1–14

5. Engeda, A., and Whitbeck, N., 1993, “Flow Similarities at Inlet to Centrifugal Pumps and Compressors During Part Load Operation,” Pump Noise and Vibrations, 1st International Conference, Clamart, France, July 7–9, pp. 59–65

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