Influence of water entry balance device on the performance of suction chamber self-balancing multistage centrifugal pump
Starting from the water inlet mode,we took the self-balancing multistage centrifugal pump as the research object,and explored the influence of the water inlet balancing device on the performance of suction chamber in the self-balancing multistage centrifugal pump.We took the distance between the center of the balance water pipe and the outlet of the water entry balancing device and the diameter of the balance water pipe as design variables;constructed 5 groups of different comparison schemes based on the equally spaced control variable method;used CFD method to simulate and analyze the external characteristics,pressure distribution,velocity streamline distribution and cavitation performance of the schemes.The results show that,the head and efficiency of the self-balancing multistage centrifugal pump is affected by the presence,location and size of the balance water pipe.In the comparison scheme,the range of centrifugal pump head is 2 m and the range of efficiency is 0.27 percentage points.As the distance between the center of the balanced water pipe and the outlet of the water inlet balancing device or the diameter of the balanced water pipe becomes smaller,the high pressure area in the suction chamber increases obviously,while the eddy current density decreases obviously,and the flow line becomes smoother.The cavitation area in the suction chamber decreased significantly,and the maximum volume fraction of the suction chamber of the optimized scheme was 90.91%,which was 5.4%lower than the maximum volume fraction before optimization.
water entry balance deviceself-balancing multistage centrifugal pumpperformance of suction chambercomputational fluid dynamics
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