Complex energy conversion and energy dissipation occur in pump-turbines during the load rejection process. However, the underlying fluid mechanism is not clear. In order to solve these problems, in this study, a three-dimensional (3D) transient turbulent flow in a pump-turbine, with clearance during the load rejection process, was simulated using the method of coupling of the rigid rotor motion with flow and dynamic mesh technology. The simulated rotational speed shows good agreement with the experimental data. Most of the differences of rotational speed between simulations and experiments are very small and lower than 5%. Based on the numerical simulation, the energy conversion process, loss distribution, and flow mechanism in a pump-turbine were analyzed using the method of coupling of the entropy production analysis with the flow analysis. The results indicate that the load rejection process of a pump-turbine is an energy-dissipation process where the energy is converted among various energy forms. After load rejection, the hydraulic loss in the reverse pump process distributes primarily in the stay/guide vanes (GV), the vaneless space, and near draft tube inlet. While the hydraulic losses in the runaway process and the braking process are distributed mainly in the elbow section of the draft tube, the clearance of runner (RN), and the vaneless space, the hydraulic losses are mainly caused by viscous dissipation effects of the vortex flows, including the flow separation vortices, the shedding vortices of flow wake, the secondary flow, and the backflow.
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October 2018
Research-Article
Energy Analysis in a Pump-Turbine During the Load Rejection Process
Xiaolong Fu,
Xiaolong Fu
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: fuxiaolonghit@163.com
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: fuxiaolonghit@163.com
Search for other works by this author on:
Deyou Li,
Deyou Li
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: lideyou@hit.edu.cn
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: lideyou@hit.edu.cn
Search for other works by this author on:
Hongjie Wang,
Hongjie Wang
Professor
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: wanghongjie@hit.edu.cn
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: wanghongjie@hit.edu.cn
Search for other works by this author on:
Guanghui Zhang,
Guanghui Zhang
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: zhanggh@hit.edu.cn
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: zhanggh@hit.edu.cn
Search for other works by this author on:
Zhenggui Li,
Zhenggui Li
Key Laboratory of Fluid and Power Machinery
(Xihua University),
Ministry of Education Sichuan,
Chengdu 610039, China
e-mail: lzhgui@mail.xhu.edu.cn
(Xihua University),
Ministry of Education Sichuan,
Chengdu 610039, China
e-mail: lzhgui@mail.xhu.edu.cn
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Xianzhu Wei,
Xianzhu Wei
State Key Laboratory of Hydro-Power Equipment,
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: weixianzhu@hit.edu.cn
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: weixianzhu@hit.edu.cn
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Daqing Qin
Daqing Qin
State Key Laboratory of Hydro-Power Equipment,
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: qindq@hec-china.com
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: qindq@hec-china.com
Search for other works by this author on:
Xiaolong Fu
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: fuxiaolonghit@163.com
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: fuxiaolonghit@163.com
Deyou Li
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: lideyou@hit.edu.cn
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: lideyou@hit.edu.cn
Hongjie Wang
Professor
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: wanghongjie@hit.edu.cn
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: wanghongjie@hit.edu.cn
Guanghui Zhang
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: zhanggh@hit.edu.cn
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: zhanggh@hit.edu.cn
Zhenggui Li
Key Laboratory of Fluid and Power Machinery
(Xihua University),
Ministry of Education Sichuan,
Chengdu 610039, China
e-mail: lzhgui@mail.xhu.edu.cn
(Xihua University),
Ministry of Education Sichuan,
Chengdu 610039, China
e-mail: lzhgui@mail.xhu.edu.cn
Xianzhu Wei
State Key Laboratory of Hydro-Power Equipment,
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: weixianzhu@hit.edu.cn
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: weixianzhu@hit.edu.cn
Daqing Qin
State Key Laboratory of Hydro-Power Equipment,
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: qindq@hec-china.com
Harbin Institute of Large Electrical Machinery,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: qindq@hec-china.com
1The authors contribute equally to the paper.
2Corresponding authors.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 5, 2017; final manuscript received April 15, 2018; published online May 18, 2018. Assoc. Editor: Wayne Strasser.
J. Fluids Eng. Oct 2018, 140(10): 101107 (12 pages)
Published Online: May 18, 2018
Article history
Received:
September 5, 2017
Revised:
April 15, 2018
Citation
Fu, X., Li, D., Wang, H., Zhang, G., Li, Z., Wei, X., and Qin, D. (May 18, 2018). "Energy Analysis in a Pump-Turbine During the Load Rejection Process." ASME. J. Fluids Eng. October 2018; 140(10): 101107. https://doi.org/10.1115/1.4040038
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