CFD simulation of shutdown transient process of pumped storage power station under pump conditions
Zhang Languo1,2, Zhou Daqing1, Chen Huixiang3
1.College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 211100, China; 2.Power China Beijing Enginee-ring Corporation Limited, Beijing 100024, China; 3.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China
Three-dimensional unsteady numerical simulations, combined with the normal single-phase model and the VOF model, were executed on the geometrical model of the whole flow system of a pumped storage power station. Through numerical calculation, the changeable flow configuration and variation law of some parameters, such as unit rotating speed, flux, runner moment and pressure of measurement points were obtained and compared with experimental data. Results show that the extreme value of unit rotating speed and measurement points pressure agree fairly well with experimental data. In the shutdown transient process, pressure variation at spiral casing inlet and draft tube inlet is influe-nced by the closure law of guide vanes, while that between runner and guide vanes is mainly affected by runner rotation. As guide vanes close and flux decreases, water flows upstream through the inner side of the draft tube and rotates with the runner. After guide vanes close completely, vortex inside the draft tube is the key factor of its hydraulic energy loss.
ZHANG 蓝Guo-,,ZHOU Da-Qing- et al. CFD simulation of shutdown transient process of pumped storage power station under pump conditions[J]. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(8): 674-680.
Zhang Chun. Study on transition process of load successive rejection of multiple units per penstock in pumped storage hydropower power station[J]. Water Resources and Hydropower Engineering,2011,42(12):66-70,83.(in Chinese)
Jiang Wei, Zhang Jian. Influence of water conveyance tunnel diameter on pressure at draft tube inlet of reversible units load successive rejection[J]. Water Resources and Power, 2013,31(10):159-163.(in Chinese)
Liu Yanze,Chang Jinshi. Numerical method based on internal character for load rejection transient calculation of a bulb turbine installation[J].Journal of China Agricultural University,2008,13(1):89-93.(in Chinese)
Li Jinwei,Liu Shuhong,Zhou Daqing,et al. 3D unsteady turbulent simulation of the runaway transients of the Francis turbine[J].Journal of Hydroelectric Enginee-ring,2008,27(6):148-152.(in Chinese)
Li J, Yu J, Wu Y. 3D unsteady turbulent simulations of transients of the Francis turbine[C]//25th IAHR Symposium on Hydraulic Machinery and Systems: Earth and Environmental Science. Timisoara: IAHR Symposium,2010,12: 1-10.
Cherny S,Chirkov D,Bannikov D,et al.3D numerical simulation of transient processes in hydraulic turbines[C]//25th IAHR Symposium on Hydraulic Machinery and Systems: Earth and Environmental Science. Timisoara:IAHR Symposium,2010,12: 71-81.
Yang Shuai, Chen Xin, Wu Dazhuan, et al. Dynamic analysis of the pump system based on MOC—CFD coupled method[J]. Annals of Nuclear Energy, 2015,78:60-69.
Zhang Xiaoxi, Cheng Yongguang, Yang Jiandong, et al. Simulation of the load rejection transient process of a francis turbine by using a 1-D-3-D coupling approach[J]. Journal of Hydrodynamics, 2014,26(5):715-724.
Zhou Daqing,Zhang Languo. Numerical experiments in power-off transients process of pumped storage power station under pump condition[J].Journal of Huazhong University of Science and Technology:Natural Science Edition, 2014,42(2):16-20.(in Chinese)