Large Eddy Simulation Analysis of Three-dimensional Flow Characteristics of Pump Turbine during Load Increase and Decrease
Abstract
LES (Large Eddy Simulation) is used to carry out 3-D unsteady numerical simulation of pump turbine's load increase and decrease transition process. Various vortex structures in the blade passage with different opening degrees are captured, vortex distribution in the blade passage is displayed, flow structure change characteristics in turbine and pump operating regions with low flow rate are analyzed, relationship between attack angle and blade passage vortex structure is revealed, different forms of blade passage vortex are studied, horseshoe vortex identification variables are proposed, and turbine operating conditions and pump operating conditions vortex structure change characteristics are compared. " The calculation shows that the hydraulic stability of the pump-turbine is closely related to the flow structure characteristics when the operating conditions of the unit are changed. During the load increase and decrease transition process, the size and distribution range of the vane vortex structure change greatly with time, which is the main factor affecting the great change of flow pattern.
Full Text:
PDFReferences
Li Jun, Chloe Wang, Liao Weili. Analysis of internal flow field characteristics in "S" shaped region of reversible pump turbine [J]. Journal of Agricultural Engineering, 2014,30 (15):106-113 .
You Guanghua, Kong Linghua, Liu Deyou. The "S" shape characteristics and countermeasures of pump turbine in Tianhuangping Pumped Storage Power Station [J]. Journal of Hydroelectric Power Generation, 2006.25（6）：136-139 .
LIU J T，LIU S H，SUN Y K，et al . Numerical simulation of pressure fluctuation of a pump-turbine with MGV at no-l oad condition［C］//IOP Conference Series：Earth and Environmental Science.［S.L.］：IOP Publishing，2012 ．
XIAO Y X，XIAO R F . Transient simulation of a pump - turbine with misaligned guide vanes during turbine mod⁃ el start-upXZ80 05J］. Acta Mechanica Sinica，2014，30（5）：646-655 .
Tao Ran, Xiao Ruofu, Yang Wei, et al. . Hump Characteristics of Reversible Pump Turbine Pump Working Conditions [J ］. Journal of Irrigation and Drainage Mechanical Engineering, 2014，32（11）：927-930 .
Wang Huanmao, Wu Gang, Wu Weizhang, et al. . Numerical Simulation and Analysis of Hump Region of Francis Pump Turbine [J ］. Journal of Hydroelectric Power Generation, 2012，31（6）：253-258 .
HASMATUCHI V，FARHAT M，ROTH S，et al . Experimental evidence of rotating stall in a pump-turbine at off-design co nditions in generating mode［J］. Journal of Fluids Engineering，2011，133（5）：051104 .
Xia Linsheng, Cheng Yongguang, Cai Fang, et al. . Numerical Analysis of Flow Characteristics in Four Quadrant Working Area of Pump Turbine [J ］. Journal of Water Conservancy, 2015，46（7）：859-868 .
Zhang Yaoliang, Zhu Weibing . Tensor Analysis and Its Application in Continuum Mechanics [m ］. Harbin: Harbin Engineering University Press ".2004：198-219 .
Wu Yulin, Liu Shuhong, Qian Zhongdong . Hydromechanical Computational Fluid Dynamics [M ］. Beijing: China Water Resources and Hydropower Publishing House, 2007.
Wang Fujun. Computational Fluid Dynamics Analysis-Principles and Applications of -CFD Software [M]. Beijing: Tsinghua University Publishing House, 2004.
MENEVEAU C，KATZ J . Scale-invariance and turbulence models for large-eddy simulation［J］. Annual Review of Fluid Mechanics，2000，32：1-32 .
REBOLLO T C，LEWANDOWSK R . A variational finite element model for large-eddy simulations of turbulent flows［J］. Chinese Annals of Mathematics，（Series B），2013，34（5）：667-682 .
Guo Tao, Zhang Lixiang . Study on Turbulent Characteristics and Blade Vortex Structure in Guide Mechanism of Francis Turbine with Small Opening [J ］. Engineering Mechanics, 2015，32（6）：222-230 .
Chen Qigang, Qi Meilan, Li Jinzhao . Study on Kinematic Characteristics of Horseshoe Vortex Upstream of Open Channel Column [J ］. Journal of Water Conservancy, 2016，47（2）： 158-164.
ADILOZTURK N，AKKOCA A，SAHIN B . Flow details of a circular cylinder mounted on a flat plate［J］. Jour⁃ na l of Hydraulic Research，2008，46（3）：344-355 .
JEONG J，HUSSAIN F . On the identification of a vortex［J］. Journal of Fluid Mechanics，1995，285：69-94 .
Refbacks
- There are currently no refbacks.
