大型流道系统水力学特性及体型优化研究  

Hydraulic Characteristics and Habitus Optimization for the Large Inlet Conduit System

作　　者：孙东坡[1] 闫文周 王鹏涛[1] 王二平[1] 杨真真[1] 

机构地区：[1]华北水利水电学院,河南郑州450011 [2]河南省电力设计院,河南郑州450005

出　　处：《应用基础与工程科学学报》2011年第1期9-19,共11页Journal of Basic Science and Engineering

基　　金：国家自然科学基金(50779019;51079055)

摘　　要：基于对流道紧凑布置、安全运行的需求,对某电厂超超临界机组流道系统的水力学特性及体型优化进行了研究.分析了流道的阻力及能耗特性,采用数值模拟与模型试验相结合的方法开展研究.水力计算表明滤网、拦污栅等过流部件的局部损失占流道总能耗的95%以上,正确选择十分重要.利用二维水流数学模型提出了包括曲线引水导墙、流线型支墩的紧凑短流道布置优化方案.通过物理模型验证表明,正常运行时进口流态平顺,各流道进流均匀.在边墙开设曲线孔道,利用压差为内侧流道补流;在引水过渡段设曲线导流潜堰抑制环流,均可提高内侧流道过流能力,改善进流均匀性,保证流道在非正常低水位运行的安全性.For the conduit system of super critical generating unit,the hydraulic characteristics and habitus optimization were studied,based on the requirement of the compact layout and safe operation to the conduit.The conduit resistance and energy consumption were analyzed with the method combined 2-D numerical simulation with scale model.It＇s very important to choose the reasonable local resistance of the filter and trash rack because it accounted for more than 95% of the total energy consumption.The optimal design of the compact short-inlet conduit which contains circularity diversion wall and streamline buttress is put forward by 2-D numerical simulation.The results from scale model show that,in normal operation（water depth over 1.45m）,the flow are both smooth in the inlet and conduit.In off-normal operation（low water depth：1.45—1.35m）,it can raise flow capacity of inner conduit and improve the flowing uniform,to set up a series oblique orifices in sidewall,supplying flow to inner conduit by difference pressure,or set up submerged curve weir at transition zone,restraining circulating current.The optimal design can ensure safety-stability operation of conduit in normal or off-normal conditions.

关 键 词：进水流道 比尺模型 数值模拟 优化布置 压差补偿 

分 类 号：TV132[水利工程—水力学及河流动力学]