|
|
|
| Low head pumping system performances and affinity issues under variable speed operation based on CFD |
| Zhang Rentian1,2, Yao Linbi2, Zhu Honggeng1, Zhang Lihua1, Wei Jun3 |
| (1.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009，China; 2. Jiangsu Surveying & Design Institute of Water Resources Co.Ltd., Yangzhou, Jiangsu 225009, China; 3. Yangzhou Water Conservancy Bureau, Yangzhou, Jiangsu 225001, China) |
|
|
|
|
Abstract In order to adjust working conditions of variable speed operations with variable frequency drives applied in low head pumping stations in the South to North Water Diversion Project, the relationship between heads and discharge rates of pump and pumping system under different rotational speeds were analyzed with affinity law. It is found out that the relationship between heads and discharge rates of pump corresponds to the conventional affinity law under different speeds, but that of pump system does not. The flow fields in passages, especially those in discharge passages affected by the outflow of pump, don′t follow the kinetic similarity rules when the pumping system is operated under different rotational speeds. Errors produced when the conventional affinity law is applied to predict the low head pumping system performances. The flow fields distributions of a typical tubular pumping system under three different rotational speeds were analyzed by CFD technology, which shows that the velocity distributions are different or even in the reversed direction when the variation of rational speed reaches a certain degree. The relationship at different speeds does not correspond to the affinity laws and the conventional ones cannot be adopted.
|
|
Received: 11 September 2009
Published: 30 March 2010
|
|
|
|
| [1]刘 超, 严登丰, 卢心虹，等. 离心泵变速运行研究[J]. 水泵技术, 1987(3):54-59.Liu Chao，Yan Dengfeng，Lu Xinhong，et al. Research on operation of pumps with variable speed [J]. Pump Technology, 1987(3)：54-59. (in Chinese)[2]储 训. 混流泵变速特性试验研究[J]. 水泵技术, 1989(4):54-59.Chu Xun. Study on characteristics of variable speed in mixed flow pumps[J]. Pump Technology, 1989(4)：54-59. (in Chinese)[3]Tolvanen J. Saving energy with variable speed drives[J]. World Pumps, 2008(501): 32-33.[4]Garibotti E. Energy savings and better performances through variable speed drive application in desalination plant brine blowdown pump service[J]. Desalination,2008, 220(1/3): 496-501.[5]Walski T, Zimmerman K, Dudinyak M, et al. Some surprises in estimating the efficiency of variable speed pumps with the pump affinity laws[C]//Proceedings of World Water and Environmental Resources Congress. 2003: 472-481.[6]Arnold J, Nijhuis G J. Selection，Design and Operation of Rotodynamic Pumps[M]. Netherlands: Nijhuis Pompen, 2005.[7]左东启. 模型的相似理论和方法[M]. 北京：水利电力出版社，1985.[8]张德胜, 施卫东, 关醒凡，等. 轴流泵叶轮进出口流场的测量[J]. 排灌机械, 2009,27(4):210-214.Zhang Desheng, Shi Weidong, Guan Xingfan, et al. Measurement on flow field at inlet and outlet of axial flow pump impeller[J]. Drainage and Irrigation Machinery,2009,27(4):210-214. (in Chinese)[9]朱红耕, 张仁田, 刘军， 等. 水泵转速变化对进出水流道水力损失影响的研究[J]. 农业机械学报, 2009,40(6):78-83.Zhu Honggeng, Zhang Rentian, Liu Jun, et al. Inference of rotational speed of pump on hydraulic losses in suction boxes and discharge passages[J]. Transactions of the Chinese Society for Agricultural Machinery, 2009, 40(6):78-83. (in Chinese)[10]郭绍春, 刘祥高, 王晓燕. 对万年闸泵站模型试验结果的分析[J]. 中国农村水利水电, 2006(1):103-106.Guo Shaochun, Liu Xianggao, Wang Xiaoyan. Analysis of Wannianza pumping station model test results[J]. China Rural Water and Hydropower, 2006(1):103-106. (in Chinese) |
|
|
|
