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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v5.i3.10
pages 187-196

VISUALIZATION IN WATER JET PUMP THROAT UNDER LIMITING FLOW CONDITION

Sonny H. Winoto
Department of Mechanical Engineering, National University of Singapore, Singapore 117576
D. A. Shah
Department of Mechanical and Production Engineering, The National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
H. Li
Department of Mechanical and Production Engineering, The National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

RESUMO

The effects of varying suction and delivery pressures on the so-called limiting flow condition in a water jet pump have been experimentally investigated. Reducing the delivery pressure may lead to this limiting flow condition, in which the secondary flow will no longer respond to any further reduction in the delivery pressure, accompanied by a drastic drop in the pump efficiency. The measurement results show that the limiting flow condition will not occur when the jet pump suction pressure is reduced, but it will occur earlier at lower suction pressure when the delivery pressure is reduced. However, the jet pump operation was observed to remain stable under this limiting flow condition. Flow visualizations in the jet pump mixing throat revealed that cavitation bubbles were formed well before this condition.


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