过渡段对连续弯道水流影响的数值模拟  

Numerical simulation of influence of transition section on continuously curved channel flow

作　　者：胡旭跃[1,2] 张青松[1,3] 马利军[1] 

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410114 [2]湖南省水沙科学与水灾害防治重点实验室,湖南长沙410114 [3]映秀湾水力发电总厂,四川都江堰611830

出　　处：《水科学进展》2011年第6期851-858,共8页Advances in Water Science

基　　金：国家自然科学基金资助项目(51079009);湖南省教育厅科学研究重点项目(09A004)~~

摘　　要：通过分析不同长度的过渡段对连接连续弯曲河道后弯水流的影响,探讨航道整治工程设计中过渡段长度的确定依据。在模型试验资料验证的基础上,采用RNG k-ε湍流模型和VOF方法处理自由水面的水气两相流数学模型,对连续弯道水流进行模拟计算。对比不同过渡段长度条件下后弯水流特征的变化情况,发现增加过渡段长度可以减弱前弯对后弯水流的影响。当相对过渡段长度大于一定数值后,后弯的特征水流情况保持稳定,增加过渡段长度所引起的减弱前弯水流对后弯水流影响的效应基本丧失。以后弯水流条件趋于稳定为特征定义临界过渡段长度,可作为航道尺度设计中过渡段长度取值的计算基础。The length of transition section is an important parameter of continuous meandering rivers, which has a profound influence on the flow regime in the second bend. Based on the experimental results from the physical mod- els, an air-water two-phase flow model is derived for flow simulation in the continuous bends. Both re-normalisation group （RNG） k-epsilon model and volume of fluid method （VOF） are used in the model derivation. Through inspec- ting various flow regimes due to different lengths of transition sections, it is found that the effect of flow in the front bend on the second bend can be weakened when the length of transition section increases. However, the flow in the second bend will be stabilized when the length exceeds a threshold value. The front bend has a neglectable influence on the flow in the second bend thereafter. Thus, a critical length of transition section can be defined, which can be used as the base value for the design of transition section in practical application.

关 键 词：连续弯道 模型试验 数值模拟 水流条件 过渡段长度 

分 类 号：TV122[水利工程—水文学及水资源]