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| Pressure pulsation characteristics in pump as hydraulic turbine with guide vanes |
| SHI Guangtai, LIU Xiaobing, WEI Wenjing, LIU Yang |
| Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China |
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Abstract In order to reduce amplitude of pressure fluctuation in a hydraulic turbine, a single-stage centrifugal pump was used as hydraulic turbine. A set of negative curvature guide vane was added next to the impeller outer diameter, then the performance of the turbine was studied experimentally. The geometric model of the turbine was established using Pro/E software, and the vibrational rule of pressure and pressure fluctuation in various flow passages in the turbines with and without guide vanes was calculated by means of the SST k-ω turbulence model and a CFD software. Additionally, the pressure fluctuation signals in time domain were transformed into frequency domain by making use of fast Fourier transform(FFT), finally, the distribution of pressure fluctuation in both domains were analysed. It is shown that the amplitude of pressure fluctuation in the dominated frequency and the maximum pressure fluctuation are both reduced in the volute with guide vanes, but also the amplitude of pressure fluctuation is decreased in the impeller. Meanwhile, in the draft tube, the fluid flow is stable without vortex, making the amplitude of pressure fluctuation in the dominated frequency decreases greatly. Therefore, the method of adding guide vanes can improve the performance of a pump as hydraulic turbine and reduce the amplitude of pressure fluctuation in its flow passages.
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Received: 24 December 2015
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| [1]杨军虎,张雪宁,王晓晖,等.能量回收液力透平研究综述[J]. 流体机械,2011,39(6):29-33. YANG Junhu, ZHANG Xuening,WANG Xiaohui,et al. Overview of research on energy recovery hydraulic turbine[J].Fluid machinery, 2011,39(6):29-33.(in Chinese)[2]杨孙圣,孔繁余,宿向辉,等.泵及泵用作透平时的数值模拟与外特性实验[J].西安交通大学学报,2012,46(3):37-41. YANG Sunsheng, KONG Fanyu, SU Xianghui,et al. Numerical simulation and performance experiment on pump and pump as turbine [J]. Journal of Xi'an Jiaotong University, 2012,46(3):36-41.(in Chinese)[3]毕智高,杨军虎,赵维元. 能量回收液力透平的研究现状及展望[J].流体机械,2014,42(8):41-45. BI Zhigao,YANG Junhu,ZHAO Weiyuan. Status of research of hydraulic turbines for energy recovery [J]. Fluid machinery, 2014,42(8):41-45.(in Chinese)[4]WILLIAMS A A. The turbine performance of centrifugal pumps: a comparison of prediction methods [J]. Journal of power and energy, 1994, 208(1): 59-66.[5]YANG S S, DERAKHSHAN S, KONG F Y. Theoretical, numerical and experimental prediction of pump as turbine performance [J]. Renewable energy, 2012,48(2):507-513.[6]SINGH P, NESTNANN F. A consolidated model for the turbine operation of centrifugal pumps [J]. Journal of engineering for gas turbines and power, 2011,133(6): 1-9.[7]杨孙圣,孔繁余,陈浩,等.叶片进口安放角对液力透平性能的影响[J].中南大学学报(自然科学版),2013,44(1):108-113. YANG Sunsheng, KONG Fanyu, CHEN Hao, et al. Effects of blade inlet angle on performance of pump as turbine[J]. Journal of Central South University(science and technology), 2013,44(1):108-113.(in Chinese)[8]DERAKHSHAN S, MOHAMMADI B, NOURBAKHSH A. Efficiency improvement of centrifugal reverse pumps [J]. Journal of fluids engineering, 2009,131(2): 3-11.[9]DERAKHSHAN S, MOHAMMADI B, NOURBAKHSH A. Incomplete sensitivities for 3D radial turbomachinery blade optimization [J]. Computers and fluids, 2008,37(10):1354-1363.[10]SINGH P, NESTNANN F. Internal hydraulic analysis of impeller rounding in centrifugal pumps as turbines [J]. Experimental thermal and fluid science, 2011,35(1):121-134.[11]杨孙圣,孔繁余,薛玲,等.长短叶片对液力透平性能的影响[J].农业机械学报,2012,43(7):104-107. YANG Sunsheng, KONG Fanyu, XUE Ling, et al. Effect of splitter blade on the performance of pump as turbine[J]. Transactions of the CSAM, 2012,43(7):104-107.(in Chinese) [12]牟介刚,施瀚星,郑水华,等.蜗壳断面形状对泵径向力平衡影响的研究与探讨[J].水泵技术,2013,10(3):7-10. MOU Jiegang, SHI Hanxing, ZHENG Shuihua, et al. Research and discussion of effect of volute cross-section shape on balance of radial force[J].Pump technology, 2013,10(3):7-10.(in Chinese)[13]杨孙圣, 孔繁余, 邵飞, 等. 液力透平的数值计算与试验[J]. 江苏大学学报(自然科学版), 2012, 33(2): 165-169. YANG Sunsheng, KONG Fanyu, SHAO Fei, et al. Numerical calculation and experiment of hydraulic turbine[J]. Journal of Jiangsu University(science and technology), 2012, 33(2): 165-169.(in Chinese)[14]FERNANDEZ J, BLANCE E, PARRONDO J, et al. Performance of a centrifugal pump running in inverse mode [J]. Journal of power and energy, 2004,218(4):265-271.[15]杨孙圣, 孔繁余, 张新鹏, 等. 液力透平非定常压力脉动的数值计算与分析[J]. 农业工程学报, 2012, 28(7): 67-72. YANG Sunsheng, KONG Fanyu, ZHANG Xinpeng, et al. Simulation and analysis of unsteady pressure fluctuation in hydraulic turbine[J]. Transactions of the CSAE, 2012, 28(7): 67-72.(in Chinese)[16]杨孙圣, 孔繁余, 成军, 等. 液力透平蜗壳内非定常压力脉动的研究[J]. 工程力学, 2012, 30(2): 388-393. YANG Sunsheng, KONG Fanyu, CHENG Jun, et al. Research on unsteady pressure field within a hydraulic turbine volute[J]. Engineering mechanics, 2012, 30(2): 388-393.(in Chinese)[17]龚朝晖.导叶对液力透平性能及运行稳定性影响的研究[D].兰州:兰州理工大学,2013. |
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