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| Analysis of force acting on hydraulic blade regulating mechanism of axial-flow pump during adjusting process |
| Chen Hongxun1, Zhang Weiyong1, Pan Zhijun2, Lu Weigang3, Li Bin4 |
| 1.Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; 2.Hangzhou Nanpai Construction Management Office, Hangzhou, Zhejiang 310000, China; 3.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 4.School of Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China |
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Abstract In order to study the force acting on hydraulic blade regulating mechanism of an axial-flow pump during adjusting process, experiment and simulation had been done. On one hand, a measure experiment was taken with an axial-flow pump in Jiangdu pumping station. To calculate the force acting on the tie rod, it was necessary to measure the pressure of the upper and lower cylinder of servomotor piston during blades adjusting from-6 degree to+2 degree. The result shows that the regulating force gradually decreases with the increasing of the blade angle. On the other hand, a three dimensional simulation of turbulent flow in the axial-flow pump model was performed. Based on the simulation, hydraulic moment, centrifugal moment and friction moment acting on blades adjusting from-6 degree to+2 degree were calculated as 0.2 degree to be an increasing unit. We found that hydraulic moment and centrifugal moment will work together to make the blade to rotate in the closing direction. Then the regulating force was calculated on the basis of the three resistance moments. Comparing numerical solution with experimental values, it can be found that the two results has the same property that the regulating force decreases as blade angle increases, and both the force curves are approximately linear. This work provides a reference for the design of hydraulic blade regulating mechanism of axial-flow pumps.
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Received: 11 December 2012
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