A study on the evolution of vortex in the draft tube of pump-turbine under the runaway condition

doi:10.13465/j.cnki.jvs.2019.04.033

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	A study on the evolution of vortex in the draft tube of pump-turbine under the runaway condition
	Li, Qifei 1,2; Zhao, Chaoben 1; Long, Shican 1; Quan, Hui 1,2
刊名	Zhendong yu Chongji/Journal of Vibration and Shock
	2019-02-28
卷号	38 期号:4 页码:222-228
关键词	Computer simulation Hydraulic motors Hydraulic turbines Kinetic energy Kinetics Pumped storage power plants Pumps Tubes (components) Draft tubes Guide vane openings Hydraulic instability K-epsilon turbulent model Pump-turbines Pumped storage power station Runaway conditions Turbulent kinetic energy
ISSN号	10003835
DOI	10.13465/j.cnki.jvs.2019.04.033
英文摘要	To study the hydraulic instability of pump-turbine under runaway condition with different guide vane openings, the pump-turbine of a certain pumped storage power station was employed. Based on the Realizable k-Ε turbulent model, the unsteady flow of the whole passage of the pump-turbine with seven different guide vane openings was calculated. The pressure fluctuation of the inlet of the volute, blade free section, the region between the runner and the roof, and draft tube was monitored to study the evolution of vortex shape and pressure fluctuation on the draft tube with the effects on different guide vane opening. Results show that when the guide vane opening is different under runaway condition, there is a distinct difference of the shape of the vortex. In the small guide vane opening, the vortex is obvious and the shape of the vortex changes constantly. With the increase of the guide vane opening, the shape of the vortex tends to the pattern of geometric cone from the disordered status, as well as the screw vortex rope presents the thicker tendency gradually. In the large guide vane opening, the higher velocity distribution near the vortex rope wall leads to the great loss of turbulent kinetic energy and other forms of energy near the straight cone region. Meanwhile, the key reason why great pressure fluctuation is caused in the draft tube is that the vortex is transported continuously towards the downstream. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.
语种	中文
出版者	Chinese Vibration Engineering Society
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150493]
专题	新能源学院能源与动力工程学院
作者单位	1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Key Laboratory of Fluid Machinery and Systems, Lanzhou; Gansu; 730050, China
推荐引用方式 GB/T 7714	Li, Qifei,Zhao, Chaoben,Long, Shican,et al. A study on the evolution of vortex in the draft tube of pump-turbine under the runaway condition[J]. Zhendong yu Chongji/Journal of Vibration and Shock,2019,38(4):222-228.
APA	Li, Qifei,Zhao, Chaoben,Long, Shican,&Quan, Hui.(2019).A study on the evolution of vortex in the draft tube of pump-turbine under the runaway condition.Zhendong yu Chongji/Journal of Vibration and Shock,38(4),222-228.
MLA	Li, Qifei,et al."A study on the evolution of vortex in the draft tube of pump-turbine under the runaway condition".Zhendong yu Chongji/Journal of Vibration and Shock 38.4(2019):222-228.