Experimental and Numerical Simulation Study on the Flow Characteristics of the Draft Tube in Francis Turbine

被引：18
作者：
Ji, Lei [1 ]
Xu, Lianchen [1 ]
Peng, Yuanjie [1 ]
Zhao, Xiaoyi [1 ]
Li, Zhen [1 ]
Tang, Wen [1 ]
Liu, Demin [2 ,3 ]
Liu, Xiaobing [1 ]
机构：
[1] Xihua Univ, Key Lab Fluid & Power Machinery, Minist Educ, Chengdu 610039, Peoples R China
[2] Res & Testing Ctr Dongfang Elect Machinery, Deyang 618000, Peoples R China
[3] Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China
来源：
MACHINES | 2022年 / 10卷 / 04期
基金：
中国博士后科学基金; 国家重点研发计划;
关键词：
Francis turbine; numerical simulation; laser Doppler velocimetry; draft tube; vortex rope; INSTABILITIES; CFD;
D O I：
10.3390/machines10040230
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The flow characteristics of the draft tube of a Francis turbine have a significant influence on turbine stability. Numerical simulations were performed for a Francis turbine under three different output conditions of 20%, 100%, and 120% at the rated and maximum heads. Laser Doppler velocimetry (LDV) tests were conducted to test the flow characteristics of the draft tube of the Francis turbine model. The flow characteristics in the draft tube, the mechanism of the flow characteristics change, and the effect of the opening on the vortex rope were analyzed. The results showed that the large and invisible vortex in the conical cross-section at the inlet of the draft tube gradually changed to a tangible vortex rope as the guide vane opening (GVO) increased. The pressure and velocity are significantly influenced by the GVO, and the flow characteristics in the draft tube improve as the GVO increases. Simultaneously, the influence range of the vortex rope increased as the head increased.
引用
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页数：22
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