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Validating full cavitation model with an experimental centrifugal pump

Li W., -G.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2014

Vol. 18, No 1

81--100

The full cavitation model is increasingly applied in the cavitating flow simulation and the cavitation performance prediction of a centrifugal pump to improve or optimize its hydraulic design. Since the model involves surface tension and non-condensable gas content, it can be potentially applied in predicting cavitation behaviour of a centrifugal pump when handling viscous oils that possess different surface tension and gas content than water. However, the model has not been validated extensively against experimental incipient cavitation and NPSHr (net positive suction head required) data so far. In the paper, the cavitation performance of an experimental centrifugal pump is investigated using the CFD code and the full cavitation model when pumping water. The incipient cavitation number-flow rate curve and head-NPSHa (net positive suction head available) relationship are established and compared with experimental observations. The relationship between the head and integrated vapour-liquid volume ratio in the impeller is argued. The influence of the non-condensable gas content and turbulence model on the head-NPSHa curve is clarified. The cavity pattern predicted is compared with the visualized one. The computational methods adopted and the results achieved here can be useful for the cavitation performance prediction of a centrifugal pump in engineering.

Wpływ pola prędkości za wirnikiem wstępnym na własności ssawne wirnika pompy wielostopniowej

Janczak M., Plutecki J.

Systems : journal of transdisciplinary systems science

2008

Vol. 13, spec. iss. 1/2

205--211

The impellers of multistage pumps has lower suction performance. To improve pumps suction performance was designed helical inducer. The flow field behind inducer was changed and it was different from normal inlet flow to impeller. This paper described a numerical investigations the influence of changeable flow field behind inducer on suction performance centrifugal impeller. In the results changeable inlets flow was increased require net positive suction head. It was caused by higher relative velocity of flow and small attack angle, so the cavitations bubble was formed inside blade channel. Cavitations bubble in this area more disturbed flow throw impeller and brought to quickly brake dawn cavitations curves.