Research on Pressure Fluctuation Characteristics of Large Vertical Centrifugal Pump
Large vertical centrifugal pumps are currently widely used in large-scale water conservancy projects.The pressure pulsation generated during operation may cause vibration in the unit,further affecting its performance.This study employed numerical simulation methods based on the scale-adaptive simulation(SAS)model to conduct detailed mesh division and boundary condition settings for the three-dimensional fluid domain of the pump.Through grid independence verification and experimental validation,the reliability of the numerical simulation method was proved.The results indicate that the amplitude of the main frequency of the pressure pulsation in the suction chamber decreases as the flow rate increases,and low-frequency pulsation occurs under low-flow conditions.The pressure pulsation of the impeller is mainly affected by twice the rotation frequency,while the pressure pulsation of the pressure chamber is dominated by the blade passing frequency.Especially under low-flow conditions,the amplitude of pressure pulsation in the pressure chamber increases significantly,which is closely related to fluid dynamic characteristics and the structural features of the volute.In addition,the presence of partitions in the pressure chamber plays a certain blocking role in the transmission of pressure pulsation,but at specific locations such as near the tongue,the amplitude of pressure pulsation remains relatively high.This study provides a certain guiding role for understanding the pressure pulsation characteristics of vertical centrifugal pumps.
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