【作者】 孙胜利；

【导师】 彭新民；

【作者基本信息】 天津大学 ， 水利水电工程， 2008， 硕士

【摘要】 随着紊流理论和计算机技术的不断发展,数值模拟在水利工程中的应用越来越广泛,发挥的巨大作用也日益显现出来,成为水力学研究的一个重要手段。本文采用标准k-ε紊流模型结合VOF多相流模型,建立三维数值模型,模拟泄水的整个过程,具体如下:(1)以拉西瓦拱坝为背景,建立了拱坝的三维模型,计算得到了整个流场、水垫塘底板的时均压强、近底的纵向流速和流速的矢量图,并将计算的结果与试验值进行了对比;(2)建立了官地水电站消力池的三维模型,得到了水流经过宽尾墩形成水翅的形态,中孔挑流水舌的形态,溢流堰顶、反弧段溢流中心线、反弧段闸墩中心线、消力池溢流中心线、消力池墩中心线和消力池底板的时均压强,近底的纵向流速和流速的矢量图,中孔底板的时均压强压强和纵向流速。所得结果得到了试验的验证;(3)建立了包括溢洪道水流进口、泄槽、水垫塘和下游出口的糯扎渡溢洪道三维模型,计算得到了溢流坝面、水垫塘底板和边坡的时均压强,溢洪道入口、溢流坝面、下游河道的纵向流速,挑流水舌的形态、高度和挑距,溢流坝面、水垫塘的水面线,最后将水垫塘的宽度进行了修改得到了边坡时均压强最大值与最小值的差值随宽度增加的变化趋势。更多还原

【Abstract】 With the ceaseless development of turbulence theory and computer technology,numerical simulation is used more and more comprehensive in hadraulic project and its great effect gradually becomes obvious,which have turned into one of important methods in the study of hydraulics。The paper uses standard k-εturbulence model in combination with VOF multiphase model,sets up 3D numerical model and simulates the whole process of discharge,the detail as follows:(1) Baced on the Laxiwa Arch Dam,set up the 3D model of the arch dam,the whole flow field,time-average pressure in the bottom board of plunge pool,lengthways velocity and vectorgraph near the board are obtained through computing,then compare the calculate data with the experimental data;(2) Set up the 3D model of stilling basin of the Guandi Hydropower Station,obtain the shape of nappe when flow goes through the wide end pier and the middle level hole,time- average pressure in the surface of overflow weir、the overflow and pier’s middle line in the deflector bucket and stilling basin、the bottom board of the stilling basin,lengthways velocity and vectorgraph near the board,time-average pressure and leng- thways velocity in the bottom board of the middle level hole。The data computed is approved by the experimental data;(3) Set up the 3D model including inlet of the spillway、discharge channel、plunge pool and down river,obtain the time- average pressure in the surface of overflow weir、the bottom board of the plunge pool and side slope,lengthways velocity in the inlet of the spillway、overflow weir、down river,the nappe’s shape、height and jet distance,water surface profile in the overflow weir and plunge pool,at last modify the width of the plunge pool and obtain the trend of difference of the max and min time- average pressure in the side slope with the width’s increase。更多还原