Y型宽尾墩与消力池联合消能水力特性研究

发布时间：2018-01-06 13:30

  本文关键词：Y型宽尾墩与消力池联合消能水力特性研究　出处：《武汉大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 宽尾墩 消力池 联合消能 数值模拟 水力特性

【摘要】：泄洪消能问题一直是高坝枢纽布置的控制因素,将宽尾墩与消力池联合运用于高坝消能可兼具二者特点,通过在闸后形成纵向拉高水舌增大掺气,在反弧附近扩散主流交汇碰撞形成三元水跃,不仅能提高传统消能工的消能率,而且能缩短消力池长度,减少投资,目前这种消能方式已运用于我国较多工程中。对宽尾墩与消力池联合消能水力特性进行研究,具有一定的理论意义及工程运用价值。本文在总结前人研究的基础上,以某电站为依托,对宽尾墩和消力池联合消能的三维流场进行了数值模拟,探究了不同参数对联合消能工水力特性的影响,结合模型试验数据,对宽尾墩消能特性进行了进一步研究。主要的研究内容和成果有:(1)归纳总结了宽尾墩的发展及应用情况,明确了宽尾墩各特征参数对其水流特性的影响,为研究提供了理论基础和思路。并通过模型试验验证了所采用数值模型和计算方法的合理性。(2)定义了收缩比β,宽尾墩长度l,上顶点与始折点高差h,及始折点与上缩点高差n四个参数变量,并设计了 12种宽尾墩体型。采用逐步收敛法,通过数值模拟研究了各参数变化时,对流态、水面线、流速、压力等水力参数的影响效果。在分析了宽尾墩水流特性变化规律的基础上,推荐了优化体型。(3)基于推荐体型进行整体模型试验,通过对不同工况的水力参数进行分析,验证了该体型对本工程适用性良好,并进一步研究了各水力参数的变化规律,深化了对该联合消能工水力特性的认识。
[Abstract]:The problem of flood discharge and energy dissipation has always been the control factor of the layout of the high dam hub. The combination of the wide tail pier and the stilling pool can have both characteristics and increase the aeration by forming a longitudinal water tongue behind the sluice. The three dimensional water jump formed by the collision of diffusion mainstream near the reverse arc can not only improve the energy dissipation rate of the traditional energy dissipators but also shorten the length of the stilling pool and reduce the investment. At present, this energy dissipation method has been used in many projects in China. The hydraulic characteristics of the combined energy dissipation of the wide tail pier and the stilling pool are studied. It has certain theoretical significance and engineering application value. On the basis of summarizing the previous studies, this paper numerically simulates the three-dimensional flow field of the combined energy dissipation of the wide tail pier and the stilling pool on the basis of a certain power station. The effects of different parameters on hydraulic characteristics of combined energy dissipators were investigated, and the model test data were combined. The energy dissipation characteristics of wide tail pier are further studied. The main research contents and results are as follows: 1) the development and application of wide tail pier are summarized, and the influence of characteristic parameters of wide tail pier on its flow characteristics is clarified. The theoretical basis and train of thought are provided for the study. The rationality of the numerical model and calculation method is verified by the model test. The contraction ratio 尾, the length of the wide tail pier, the height difference between the top vertex and the starting point h are defined. There are four parameter variables of the height difference between the starting point and the contraction point n, and 12 types of broad tail pier shapes are designed. The convection state, the surface line and the velocity of velocity are studied by numerical simulation when the parameters change by the method of gradual convergence. The effect of hydraulic parameters such as pressure. On the basis of analyzing the variation law of flow characteristics of wide tail pier, it is recommended to optimize the shape. 3) to carry out the overall model test based on the recommended shape. Through the analysis of hydraulic parameters under different working conditions, it is verified that this type has good applicability to the project, and the variation law of hydraulic parameters is further studied, and the understanding of hydraulic characteristics of the combined energy dissipator is deepened.
【学位授予单位】：武汉大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV653;TV135.2

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