【作者】 张利鹏；

【导师】 杨斌； 杨忠超；

【作者基本信息】 重庆交通大学 ， 水力学及河流动力学， 2008， 硕士

【摘要】 随着水电梯级开发建设速度加快,具有高水头的高坝枢纽不断出现,在西部规划和待建的船闸大部分都具有高水头的特点。船闸水头的增加使得闸室内水流紊动加剧,船舶停泊条件恶化,这直接影响到船闸本身运行的安全性和经济性,也关系到整个航路的安全顺畅。因此船闸水流的研究对船闸工程建设具有重要的实际意义。以往对船闸水流的研究主要依赖于物理模型试验,由于船闸水流结构十分复杂,常规物理模型观测信息量有限,很难详细探明闸室流场内部的水流运动。数值模拟则能弥补物理模型测试手段的不足,提供大而丰富的信息量,能得到船闸内部详细的流场水力特性,为研究船闸水力学和工程设计提供有力的科学依据。本研究采用国际上先进的紊流计算软件Fluent,选用水气两相流的VOF模型追踪模拟自由表面,采用RNG k-ε紊流模型对银盘高水头船闸水流进行三维数值模拟,对计算成果进行分析研究,得出了如下结论:1.通过前处理软件Gambit构建复杂的船闸整体水流边界和用VOF模型来处理船闸闸室自由水面是较为有效的方法。2.比较分析物理模型试验结果与数学模型计算结果得到的水力参数及其分布,二者吻合良好,从而证实数模计算结果基本正确,是可信的。3.通过对数模计算成果分析处理,得到了闸室内的流态、流速分布的矢量和等值线图和闸室不同时刻水面波动图。4.数模计算得到盖板消能工型式的耗散能分布。由于出水缝的突缩突扩和消能盖板阻挡使得水流分散和生成旋涡,在出水缝口周缘及盖板底部出水缝顶部上方水流耗散较大。5.数模计算结果信息量庞大,详尽的描述了船闸在运行中各时刻的水流漩涡形态、流速分布等信息,反映了船闸的水力特性和消能过程,是物理模型的有力补充。更多还原

【Abstract】 With the development of the construction of hydro-electric and the coming of the High Dam of high head, most of the locks in the west which are planning to be built and programmed has characteristic of high head. The raising of the level of water in the lock aggravate the flow turbulence, and worsen ship berthing conditions that directly not only affect the safety and the economy in the operation of the lock itself but also the security and smooth of the entire waterway. So it has an important and practical significance to take the study of lock flow for the construction projects. Previously, the lock flow mainly depend on the physical model test. It’s difficult to detailed the internal eddy structure and intensity in chamber flow because of the complication of the lock flow structure and the limitation of information observed in the conventional physical model .Numerical simulation can make up for the deficiency of the physical model testing, and provide a wealth of information, and get detailed hydraulic characteristicds of full flow field, and provide scientific proof for study lock hydraulics and Engineering DesignWith international advanced turbulent compute software Fluent, and RNG k ?εturbulent model, the paper make numerical simulation for 3D flow field on yin pan lock of high head., then ,Analyze carefully computing fruits, some conclusions are got as follows:1. It is a more effective method by using the Pre-treatment software GAMBIT to build complex verge and using the hydrosphere VOF two-phase model to trace lock free surface2. The coincident of the physical model test results and numerical simulation results of the hydraulic parameters and their distribution can prove the numerical simulation effective.3. The vector distribution chart and contour chart of velocity surface fluctuation chart at different time of operation. Can be got by analyzing numerical simulation results4. Get the dissipated energy distribution chart of the cover plate energy dissipation mechanism by numerical simulation. Because the effluent slit sudden reduction and energy dissipation cover plate making flow decentralize and generation vortex, Around the exit of effluent slit and bottom of the cover plate has larger energy dissipation.5.The numerical simulation with huge amount of information and detailed description vortex flow in operation of the lock, velocity distribution and other information reflecting the characteristics of the hydraulic lock and energy dissipation process is a powerful physical model added supplement.更多还原