转弯半径对引水式水电站弯道排冰影响的数值模拟  

NUMERICAL SIMULATION OF EFFECT OF TURNING RADIUS ON ICE REMOVAL IN BEND CHANNEL OF DIVERSION TYPE POWER HOUSE

作　　者：王晓玲[1] 蒋志勇[2] 周莎莎[3] 周正印[3] 张自强[3] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]中水北方勘测设计研究院有限责任公司,天津300222 [3]天津大学环境科学与工程学院,天津300072

出　　处：《工程力学》2011年第2期152-158,共7页Engineering Mechanics

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB714101);国家自然科学基金项目(50879053);天津市应用基础及前言技术研究计划项目(09JCYBJC08700)

摘　　要：水电站引水渠道中的冰害会影响水电站的安全运行,危害当地人民的人身安全,因此,输排冰运行方式的成败便成为引水式水电站冬季安全运行的关键所在。建立了三维非稳态欧拉两相流模型,在水流流动过程冰的动量源项中考虑了相间曳力、升力、虚拟质量力的作用,以及密度差的影响。模拟分析了不同转弯半径对弯道排冰的影响,结果表明:转弯半径为200m时弯道内的水流平缓,流速分布较均匀,排冰闸前的浮冰量最大,排冰量最大,冰水比相对较大,排冰效果最好。可知,转弯半径200m时为最佳布置形式,从而实现了对弯道输排冰的布置形式进行合理的优化设计,以达到顺利输排冰,保证冬季安全运行的目的。通过与Blanckaert所做的弯道冲淤试验水槽实验结果对比,验证了模型的可靠性。The ice damage of diversion channel is dangerous to the hydropower station operation,even results in great life losses,so the operation mode of the ice delivery and sluicing is key to diversion-type hydropower station in winter.A 3D unsteady Eulerian two-phase model is developed.The momentum transfer term includes the drag,virtual mass,lift forces,and density difference.The results under different turning radius are as follows： When the turning radius is 200m,the water flow is steady,the water velocity distribution is homogeneous,the amount of floating ice reaches its maximum,and the ice removal efficiency is the highest.Therefore,the optimum turning radius is 200m,and the reasonable design of ice gate can ensure the smooth removal of ice and the safety operation of hydropower station.The prediction by the present model for ice removal of bend channel is confirmed by the experimental results of open channel bend reported by Blanckaert.

关 键 词：转弯半径 弯道排冰 三维非稳态欧拉两相流 引水式水电站 浮冰 

分 类 号：TV875[水利工程—水利水电工程]