圆柱型岛屿浅水尾流流动模式的研究  

The Research on Flow Pattern of Cylinder Island in the Shallow Water Layer

作　　者：李玲[1] 李玉梁[1] 陈嘉范[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《科学技术与工程》2002年第4期5-9,共5页Science Technology and Engineering

基　　金：国家自然科学基金(50079010)

摘　　要：对直径为1.27m的圆柱型岛屿在浅水层中尾流的流动模式进行了数值模拟与实验研究。采用数字图像测速(DPIV)系统对圆柱型岛屿尾流区的流态进行了测量,实验结果给出了全流场的速度流线图,表明了尾流区流动的特征,并采用尾流稳定性参数S将尾流区流场划分为三种流态:S<0.2为涡脱落流态;0.2<S<0.45为不稳定状态;S>0.45为稳定状态。在数值计算中求解了水深平均的Reynolds方程和RNG κ-ε湍流模型,模拟了实验条件下的尾流流动。计算结果与实验结果相吻合。A series of experiments and calculation were made to investigate shallow-water flow patterns in the wakes of cylinder island with 1.27m diameter. Measurements of flow patterns have been made in the laboratory using a digital particle image velocimetry (DPIV) system. This produces whole-field velocity vector maps of the wake flow and shows the characteristics of the wake flow. A 'wake stability parameter' S were used to classify the island wake into three types of patterns: for small values of S (S<0.2) vortex shedding is organized and vigorous in the wakes, for large values of S (0.2<S<0.45) vortex shedding is found to cease and unsteady flow appears, for great values of S (S>0.45) an steady flow turns into steady flow. Depth-averaged Reynolds equations with k-ε turbulent model based on RNG method were solved to simulate the experimental flows. The calculating results are good agreement with experimental results.

关 键 词：圆柱型岛屿 浅水尾流 流动模式 数字粒子图像测速 数值模拟 湍流模型 

分 类 号：O353.5[理学—流体力学]