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高水头大流量泄洪洞压力弯道的三维数值模拟研究
Three-dimensional numerical simulation of the pressure flow in bend tunnel with high water head and large discharge
【Author】 Zhang Hongwei Zhang Dong Wu Yihong Liu Zhiping (China Institute of Water Resources and Hydropower research,Beijing,100038,China)
【机构】 中国水利水电科学研究院；
【摘要】 应用商用软件 FLUENT 对锦屏一级水电站"龙落尾"式泄洪洞有压弯段进行了三维数值模拟。速度与压力的耦合采用 SIMPSLE 算法,紊流模型采用标准 k-ε模型。对进出口计算域进行了延长,对延长后计算域上的自由水面采用 VOF 方法处理。计算得到的流量系数及出口两侧边墙的压力分布与试验结果符合良好。重点关注出口偏流特性,详细研究了不同弯道半径和转弯角度对出口速度和压力分布的影响。研究成果对高水头大流量泄洪道的优化设计和布置有重要意义。
【Abstract】 The CFD software Fluent is applied to study the hydraulic characteristics of bend spillway tunnel with high head and large discharge.The discharge capacity and distribution of pressure on both two sidewalls at the outlet are calculated firstly.The results are in good agreement with model test. This shows that the standard k-εturbulence model combined with VOF method can simulate successful- ly the pressure flow,which have free surface on the extended computation domains.However,the main concern is on the characteristics of the partial flow at the outlet.Effects of the radius and the cen- tral angle of the bend tunnel on the outlet distributions of velocity and pressure are studied in detail. The results are significant for optimizing layout of the spillway tunnel with high water head and large discharge.
【Key words】 bend spillway tunnel； numerical simulation； k-εturbulence model； VOF method； partial flow；
- 【会议录名称】 第三届全国水力学与水利信息学大会论文集
- 【会议名称】第三届全国水力学与水利信息学大会
- 【会议时间】2007-10
- 【会议地点】中国江苏南京
- 【分类号】TV65;TV135.2
- 【主办单位】国际水利工程与研究协会中国分会、中国水利学会水力学专业委员会、中国水力发电工程学会水工水力学专业委员会