NDLI: Influence of Blade Leading-Edge Shape on Cavitation in a Centrifugal Pump Impeller

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Influence of Blade Leading-Edge Shape on Cavitation in a Centrifugal Pump Impeller

Content Provider	MDPI
Author	Tao, Ran Xiao, Ruofu Wang, Zhengwei
Copyright Year	2018
Description	Cavitation is an important issue in pumps and usually starts on the blade leading-edge. For fixed blades with constant rotational speeds and specific flow rates, the incident angle, which is between the flow direction and the blade installing direction, on the blade leading-edge plays the key role in the cavitation process. The leading-edge shape is crucial on the local flow separation, pressure distribution, and cavitation. Hence, the influence of the leading-edge shape on cavitation has been studied in the current work in a centrifugal pump impeller. The blunt, sharp, ellipse and round leading-edge cases were compared using numerical simulation and verified by experimental data. Results show different features of cavitation. The round and ellipse leading-edge impellers have higher inception cavitation coefficient. It was caused by the sudden pressure drop on leading-edge arc or elliptical arc. The sharp and blunt leading-edge impellers have a wide flow-separation region on leading-edge with a wide low-pressure region. This is because of the sudden turn in geometry on the leading-edge corner. Cavitation grew quickly after inception and caused rapid head-drop in the sharp and blunt leading-edge impellers. Results suggest the critical cavitation performance is dominated by the leading-edge low-pressure area while the inception cavitation is mostly affected by the minimum pressure value on the leading-edge. The critical cavitation performance can be evaluated by checking the leading-edge low-pressure area. The inception cavitation can be evaluated by checking the minimum pressure value on the leading-edge. These strategies can be used in the further leading-edge designs.
Starting Page	2588
e-ISSN	19961073
DOI	10.3390/en11102588
Journal	Energies
Issue Number	10
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2018-09-28
Access Restriction	Open
Subject Keyword	Energies Aerospace Engineering Centrifugal Impeller Leading-edge Shape Cavitation Pressure Drop Rotation Correction
Content Type	Text
Resource Type	Article

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