Pressure fluctuation near double volute tongue for double-suction centrifugal pump
WANG Jiabin1, CHEN Jia2, YUAN Shouqi2, PEI Ji2, MENG Fan1
1.Shanddong Shuanglun Co. Ltd., Wweihai, Shandong 520000, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：To study the pressure fluctuation near double volute tongue of a large flow rate double-suction centrifugal pump, the three-dimensional unsteady turbulent flow was numerically simulated with CFD software under different operational conditions. The characteristics of flow field and pressure fluctuation of the monitoring points near volute tongue were obtained, and pressure fluctuation intensity as well as the time and frequency spectra was analyzed respectively. The results show that high-pressure fluctuation intensity areas are mainly located between impeller outlet and volute tongue, which shows that the interaction of impeller and tongue will cause strong pressure fluctuation near volute tongue. Fluctuation intensity under 1.0Qd flow rate near both volute tongues is lower than that under large and small flow rates, and the distribution of pressure fluctuation intensity near A tongue becomes uniform gradually with the increasing of flow rate. Under 1.0Qd flow rate examined, in A tongue width direction, the double rotating frequency dominates the pressure fluctuation on middle position while other two sides are only one blade passing frequency; the dominant frequency on middle position and one side in B tongue width direction is double blade passing frequency while the other side is only one blade passing frequency. Under 1.0 Qd and 1.2Qd flow rate, the dominant frequency is double blade passing frequency at point P0 on middle position in A tongue width direction while it is only one blade passing frequency under 0.8Qd,and unapparent change of amplitude can be found for any flow rates in A tongue width direction, however, the pressure fluctuation amplitude on the same position near B tongue increases significantly under the conditions of 0.8Qd and 1.2Qd flow rate.
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