摘要
结合姚家平水利枢纽工程的总体布置,对主电站引水系统对称Y形和非对称Y形月牙肋钢岔管两种结构型式分别进行了三维有限元应力分析和CFD三维流场计算。计算结果表明:对称岔管两腰部位应力分布均匀,肋板尺寸较小;但在主支锥管相贯线内表面A点附近出现较大的应力集中现象,因此对称岔管满足强度所需的管壁厚度大于非对称岔管。在水力学方面,非对称岔管两支管的水头损失不相等,其中与主管同轴线的直支管水头损失最小,斜支管水头损失最大,但没超过对称岔管的0.358 m,说明从岔管部位水头损失和水流流态上看,非对称岔管也稍优于对称Y形岔管。综合考虑岔管结构和水力学特性以及工程地形等因素,建议姚家平水利枢纽工程中主电站引水发电系统选择非对称Y形岔管布置方案。
Combined with the general layout of Yaojiaping Hydraulic Project,this paper carries out three dimensional finite element stress analysis and flow field calculation respectively for the diversion system of the main power station with symmetrical Y shape and asymmetric Y shape crescent ribbed steel bifurcation.The calculation results show that the stress distribution at the two sides of symmetrical bifurcation is relatively uniform and the size of the rib is smaller.However,the stress concentration is greater near point A on the inner surface of the main branch taper intersecting line In terms of hydraulics,the head loss of two branches of asymmetric bifurcated pipe is not equal.The straight branch pipe with the main coaxial line has the smallest head loss,and the inclined branch pipe has the largest head loss,but not more than 0.358m of symmetrical bifurcation.It shows that the asymmetric bifurcation is slightly better than the symmetrical Y-shaped bifurcation in terms of head loss and flow pattern of the bifurcation.Considering the structural and hydraulic characteristics of bifurcation as well as the en⁃gineering topography,it is suggested that the asymmetric Y-shaped bifurcation layout should be chosen for the diversion system of the main power station in Yaojiaping Hydropower Project.
作者
刘贤才
张雨萌
汤怀萱
胡悦
伍鹤皋
LIU Xian-cai;ZHANG Yu-meng;TANG Huai-xuan;HU Yue;WU He-gao(Hubei Water conservancy and Hydropower Planning Survey and Design Institute Co.Ltd,Wuhan 430070,Hubei Province,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,Hubei Province,China)
出处
《中国农村水利水电》
北大核心
2024年第1期231-236,共6页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(51409194)。
关键词
水电站
对称Y形钢岔管
非对称Y形钢岔管
体形设计
有限元法
CFD
hydropower station
symmetrical Y-shaped steel bifurcation
asymmetric Y-shaped steel bifurcation
shape design
finite ele⁃ment method
CFD
