Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump

被引:0
|
作者
Qianqian Li
Shiyang Li
Peng Wu
Bin Huang
Dazhuan Wu
机构
[1] Zhejiang University,College of Energy Engineering
[2] Zhejiang Zhixin Technology Co.,undefined
[3] Ltd,undefined
[4] Ocean College,undefined
[5] Zhejiang University,undefined
[6] The State Key Laboratory of Fluid Power Transmission and Control,undefined
来源
Chinese Journal of Mechanical Engineering | 2021年 / 34卷
关键词
Double-suction centrifugal pump; Pressure fluctuation; Flow uniformity; Numerical simulation;
D O I
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中图分类号
学科分类号
摘要
Double-suction centrifugal pumps have been applied extensively in many areas, and the significance of pressure fluctuations inside these pumps with large power is becoming increasingly important. In this study, a double-suction centrifugal pump with a high-demand for vibration and noise was redesigned by increasing the flow uniformity at the impeller discharge, implemented by combinations of more than two parameters. First, increasing the number of the impeller blades was intended to enhance the bounding effect that the blades imposed on the fluid. Subsequently, increasing the radial gap between the impeller and volute was applied to reduce the rotor-stator interaction. Finally, the staggered arrangement was optimized to weaken the efficacy of the interference superposition. Based on numerical simulation, the steady and unsteady characteristics of the pump models were calculated. From the fluctuation analysis in the frequency domain, the dimensionless pressure fluctuation amplitude at the blade passing frequency and its harmonics, located on the monitoring points in the redesigned pumps (both with larger radial gap), are reduced a lot. Further, in the volute of the model with new impellers staggered at 12°, the average value for the dimensionless pressure fluctuation amplitude decreases to 6% of that in prototype pump. The dimensionless root-mean-square pressure contour on the mid-span of the impeller tends to be more uniform in the redesigned models (both with larger radial gap); similarly, the pressure contour on the mid-section of the volute presents good uniformity in these models, which in turn demonstrating a reduction in the pressure fluctuation intensity. The results reveal the mechanism of pressure fluctuation reduction in a double-suction centrifugal pump, and the results of this study could provide a reference for pressure fluctuation reduction and vibration performance reinforcement of double-suction centrifugal pumps and other pumps.
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