Influence of inflows on internal flow stability of a centrifugal pump
To investigate the effect of inflow on the internal flow of a centrifugal pump,a specific mo-del of centrifugal pump was selected as the research object.Five inflow schemes were designed by ar-ranging a straight pipe and four different inflow directions(0°,90°,180°,270°)by using a tee at the pump inlet.Numerical calculation methods were used to simulate and analyze the internal flow of the centrifugal pump,thereby exploring the effects of different inlet pipelines on the pump's internal flow was studied by using the SST k-ω turbulence model.The results indicate that different inflow angles have a significant effect on the internal flow characteristics of the centrifugal pump.The disturbance of inflow causes the distribution of secondary flows and separation vortices within the impeller to change along the rotation direction of the tee.Additionally,the magnitude and direction of the radial force ex-perienced by the impeller also change.The results show that the 90° tee is most favorable for balancing the radial force on the impeller.By analyzing the head characteristic curves and efficiency characteris-tic curves,it is found that different inlet pipeline types have a certain impact on the performance and efficiency of the pump.This study is of great significance for understanding the effect mechanism of dif-ferent inflows on the instability of internal flow in centrifugal pumps.It contributes to addressing flow-induced vibration issues caused by uneven inflow and provides further support for flow control strategies and design optimization methods.
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