Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units
作者机构：Qinghai University of Science and TechnologyXining 810000China Key Laboratory of Fluid and Power MachineryMinistry of Education(Xihua University)Chengdu 610039China South-to-North Water Diversion East Jiangsu Water Source Co.Ltd.Nanjing 210029China School of civil engineering and water resourcesQinghai UniversityXining 810016China Dongyuan Branch of Shenzhen Water Planning and Design Institute Co.Ltd.Changsha 410000China
出 版 物：《International Journal of Agricultural and Biological Engineering》 (国际农业与生物工程学报（英文）)
年 卷 期：2024年第17卷第1期
页 面：163-171,F0002页
核心收录：
学科分类：08[工学] 080103[工学-流体力学] 0828[工学-农业工程] 0801[工学-力学（可授工学、理学学位）]
基 金：the National Natural Science Foundation,China(Grant No.52079118) Key Research and Development Plan of Sichuan Provincial Department of Science and Technology(Grant No.2023YFQ0021) Qinghai Province“Kunlun Talents High-end Innovation and Entrepreneurship Talent Program”Qinghai University of Science and Technology talent introduction of scientific research special grants,Central leading local(scientific and technological innovation base construction)project XZ202201YD0017C Jiangsu South-North Water Diversion Science and Technology R&D Project(Grant No.JSNSBD202303).
主 题：cavitation vortex rope vorticity transport equation vortex line draft tube
摘 要：Draft tube vortex rope is considered a special cavitation flow phenomenon in tubular turbine units.Cavitation vortex rope is one of the most detrimental factors affecting the safety of hydraulic turbines.In this study,ANSYS CFX software was utilized to numerically simulate the internal cavitation flow of a hydraulic turbine draft tube.The evolution of the cavitation vortex core was characterized by vortex line distribution and vorticity transport equation.The shape and number of blades influenced the revolving direction and distribution characteristics of the vortex close to the runner cone,which formed a counterclockwise-clockwise-counterclockwise distribution pattern.Simultaneously,there were many secondary flows in the draft tube.Mutual cancellation and dissipation between the flows was one of the reasons for reduction in vorticity.When the cross-sectional shape of the draft tube was changed,the vorticity was distributed from the center of the vortex rope to all parts of the cross-sectional draft tube,with extreme values at the center and at the walls.The vortex stretching and dilatation terms played a major role in the change in vorticity,with the baroclinic torque having an effect at the center of the vortex rope,this study is helpful to understand the flow of water in the draft tube and guide the design and optimization of the draft tube in engineering application.
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