Influence of impeller perforation parameters on performance of high-speed gas-liquid centrifugal pump
In order to maintain the performance stability of high-speed centrifugal pumps under gas-liquid two-phase conditions,CFD numerical simulation was used to investigate the effect of different aperture diameters and positions of impeller openings on the performance of high-speed centrifugal pumps.The results show that the performance of aperture pumps tends to be stable,with the inlet gas content increases,the head of aperture pump gradually decreases.While the head of the original non-porous pump decreases significantly with the increase of inlet gas content.Therefore,in the case of large inlet gas content,opening hole can improve the performance of high-speed centrifugal pump.When the inlet gas content is not enough,the performance of perforated pump is not as good as the original non-perforated pump,and the head decreases with the increase of perforated diameter.When the apertures are 3.5 mm,the head decay is more than 18%,so the apertures are not more than 3 mm.With the increase of aperture diameter,the volume of gas in impeller decreases,and the larger the aperture diameter,the greater the hydraulic loss in the pump.Therefore,when choosing the aperture,the gas volume in the impeller and the hydraulic loss of the pump must be traded off.The smaller the value of radial position of open aperture,the closer the aperture is to the center of the impeller,the greater the hydraulic loss.The larger the value of radial position of open aperture,the larger the volume of gas in the impeller,and there is still a trade-off to be made when choosing the radial position of the open aperture.For the studied high-speed centrifugal pump,the simulation results show that the choice of radial position of 14 mm and aperture diameter of 2 mm is desirable because it can well balance the gas volume and hydraulic loss in the impeller.
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