The ways to increase the efficiency of the stage of low specific speed

Puzik, R V; Kovalyov, I. O.; Ratushnyi, Oleksandr; Dzafarov, T. V.; Petrenko, S. S.

doi:10.1088/1742-6596/1741/1/012013

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…However, passages between the impeller blades of low-specific-speed centrifugal pumps are long and narrow. Once cavitation occurs, bubbles will soon fill passages; thus, the head and efficiency of the pump will decline sharply, which affects the safe and stable operation of the pump [5]. With the rapid development of aerospace technology, the petrochemical industry, and the metallurgical industry, the medium that needs to be transported is diversified increasingly.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Gas Volume Fraction on the Cavitation Performance of a Low-Specific-Speed Centrifugal Pump

Jiang

Liu

Yong

et al. 2022

Water

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In order to study the cavitation performance of centrifugal pumps with low specific speeds under the condition of gas–liquid two-phase flow, a cavitation test rig for pumping gas–liquid two-phase flow was set up. The cavitation performance of the pump with a specific speed of 32 was studied. The variation of the head, pressure pulsation intensity, and vibration intensity with the cavitation allowance NPSHa (Net Positive Suction Head available) of the centrifugal pump were obtained at different inlet gas volume fraction (IGVF) conditions of 0, 1%, 2%, and 3%. The results show that the cavitation performance of a low-specific-speed centrifugal pump can be improved obviously in a certain liquid flow range when the IGVF is 1%, especially at a low liquid flow rate. When cavitation did not occur or the degree of cavitation was low, a lower IGVF can reduce pressure pulsation intensity at the pump outlet and the vibration intensity at the pump inlet under design flow rate and high flow rate conditions. Additionally, all performances of the low-specific-speed pump are more sensitive to gas when the liquid flow rate is low. The results can provide a reference for improving the cavitation performance of low-specific-speed pumps for transporting gas–liquid two-phase flow and single-phase liquids.

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Section: Introductionmentioning

confidence: 99%