Influence analysis of inlet gas volume fraction and blade number of vortex pump on it’s inner flow field and hydraulic performance

Abstract

Abstract: In order to analyze the influence of inlet gas volume fraction and blade number on the inner flow filed and the hydraulic performance of vortex pump during gas-liquid two-phase flow, the inner flow filed and the hydraulic performance of vortex pump with different inlet gas volume fraction (5%, 10%, 15%) and different blade number (20, 22, 24, 28) were analyzed by numerical simulation. The analysis results show that the head and efficiency of the vortex pump decrease with the increase of inlet gas volume fraction with the head decreased from 48.98 m to 36.19 m, and the efficiency decreased from 34.8% to 32.4%. The pressure in the side channel on each meridional plane is greater than that in the impeller channel. The pressure difference between the maximum pressure in the casing and the minimum pressure in the impeller gradually increases along the circumference from the inlet to the outlet of the impeller, which result that the gas-liquid separation on the meridional plane is becoming more and more serious. The gas volume fraction in the impeller increases gradually while the gas volume fraction in the side channel decreases gradually, and the gas accumulation near the impeller hub becomes more and more serious. With the increase of the blade number, the head and efficiency of the vortex pump increase first and then decrease. With the increase of inlet gas volume fraction, the sensitivity of vortex pump performance with the number of blades increases first and then decreases.

Key words: vortex pump, gas liquid mixed transportation, gas-liquid two phase flow, blade number

CLC Number:

TH314

ZHANG Ren-hui, DUAN Peng, YANG Wei-feng. Influence analysis of inlet gas volume fraction and blade number of vortex pump on it’s inner flow field and hydraulic performance[J]. Journal of Lanzhou University of Technology, 2023, 49(3): 36-42.

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