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Experiment on instantaneous characteristics in centrifugal pump during startup period |
Li Zhifeng1,2, Wu Dazhuan1,2, Wang Leqin1,2, Dai Weiping1,2, Chen Fengqiu3 |
(1.Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Engineering Research Center of High Pressure Process Equipment and Safety, Ministry of Education, Hangzhou, Zhejiang 310027, China; 3.Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China) |
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Abstract To further research instantaneous characteristics in centrifugal pump during startup period, a centrifugal pump instantaneous performance test system was established. Experiments on the startup process of a centrifugal pump with ball valve fully opened, semi-opened and fully closed were carried out, respectively. At the same time of testing the instantaneous explicit performances, 2D instantaneous flow field on the pump test section were captured with particle image velocimetry(PIV) technique. The reasons causing test error and relationships between external characteristics and internal flow evolutions were discussed. The results show that the internal flow of the centrifugal pump appears intense instantaneous characteristics during startup period. For startup with valve fully opened, both the instantaneous head and power increase rapidly with rotational speed increasing, and the instantaneous flow rate shows cubic trait characteristic. For startup with valve fully closed, the maximum power shock reaches 1.5 times of the steady state. The internal instantaneous flow indicates the shock is caused by fluid mixing and mutually transfer of vortex energy. The bubble and low shooting frequency are the main reasons for the PIV test errors.
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Received: 25 November 2009
Published: 30 September 2010
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[1]许友谊,奚伟永,杨敏官.高速诱导轮三维非定常湍流数值模拟[J].排灌机械,2008,26(3):59-63.Xu Youyi,Xi Weiyong,Yang Minguan.Numerical simulation of 3D unsteady turbulent flow in high-speed inducer[J].Drainage and Irrigation Machinery,2008,26(3):59-63.(in Chinese)[2]裴毅,田莉,杨晓珍,等.转速变化对离心泵性能的影响[J].排灌机械,2007,25(4):9-13.Pei Yi,Tian Li,Yang Xiaozhen,et al.Influence of rotating speed change to the performance of centrifugal pump[J].Drainage and Irrigation Machinery,2007,25(4):9-13.(in Chinese)[3]Tsukamoto H,Ohashi H.Instantaneous characteristics of a centrifugal pump during startup period[J].Journal of Fluids Engineering,1982,104(1):6-13.[4]Lefebvre P J,Barker W P.Centrifugal pump performance during instantaneous operation[J].Journal of Fluids Engineering,1995,117(2):123-128.[5]Thanapandi P,Prasad R.Centrifugal pump instanta-neous characteristics and analysis usig the method of characteristics[J].International Journal of Mechanical Sciences,1995,37(1):77-89.[6]吴大转,王乐勤,胡征宇.离心泵快速启动过程瞬态水力特性的数值模拟[J].浙江大学学报:工学版,2005,39(9):1427-1430,1454.Wu Dazhuan,Wang Leqin,Hu Zhengyu.Numerical simulation of centrifugal pump′s instantaneous perfor-mance during rapid startup period[J].Journal of Zhejiang University:Engineering Science,2005,39(9):1427-1430,1454.(in Chinese)[7]胡征宇,吴大转,王乐勤.离心泵快速启动过程的瞬态水力特性外特性研究[J].浙江大学学报:工学版,2005,39(5):605-608,622.Hu Zhengyu,Wu Dazhuan,Wang Leqin.Instantaneous hydrodynamic performance of centrifugal pump during rapid startup period:study of explicit characteristics[J].Journal of Zhejiang University:Engineering Science,2005,39(5):605-608,622.(in Chinese)[8]吴大转,王乐勤,胡征宇.离心泵快速启动过程外部特性的试验研究[J].工程热物理学报,2006,27(1):68-70.Wu Dazhuan,Wang Leqin,Hu Zhengyu.Experimental study on explicit performance of centrifugal pump during rapid startup period[J].Journal of Engineering Thermophysics,2006,27(1):68-70.(in Chinese)[9]王乐勤,吴大转.混流泵管路负载快速变化过程瞬态特性的试验研究[J].通用机械,2003(2):65-68.Wang Leqin,Wu Dazhuan.Experimental study on the instantaneous characteristics of a mixed-flow pump during rapid changes of piping loads[J].General Machinery,2003(2):65-68.(in Chinese)[10]Dazin A,Caignaert G,Bois G.Instantaneous behavior of turbomachineries:applications to radial flow pump startups[J].Journal of Fluids Engineering,2007,129(11):1436-1444. |
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