消力池出池水流对桥墩的影响
发布时间：2018-11-26 15:15
【摘要】：本文利用流体计算软件fluent提供的RNG K-ε紊流模型,采用Vof法追踪自由水面,以某水库工程的消力池为基础,采用1：100的模型比尺缩放,通过数值仿真得到了相应工程的计算结果,如池内流态,临底流速,底板动水压强,以及桥墩处的压强和流速等。 本文的研究重点是如何减小消力池出池水流对水库下游公路桥墩的影响,为此笔者提出了消力池体型的优化设计方案。采用数值仿真的方法,分析所得结果(出池水流对桥墩的作用等)是否符合工程的实际要求。从本工程的实际情况以及一些学者的研究成果来看,优化消力池的体型,必须从三个方面着手：一、控制消力池的底板压力在一定范围内(p120pa)二、控制消力池水流的临底流速在一定范围内(v0.6m/s)三、控制桥墩所在位置的压强和流速在一定范围内(p100pa, v0.4m/s),以保证在减小消力池出池水流对桥墩影响的情况下,对消力池本身不造成过大的破坏。因此下文将从这三个方面,系统的分析优化消力池体型后的计算结果是否符合工程的实际要求。 本文采用二维计算模型,计算取的是从溢洪道的消力池直至下游河水中的无限长的水域,本次计算长度设定为67cm,其中消力池宽度是l0cm,取消力池纵剖面的轴线进行研究。分别计算不同的消力池体型,水流在桥墩上游位置的流态、压强及流速的变化等。然后不断的优化消力池的体型,看能否达到工程的实际要求。选择100年一遇的流量下的工况计算并优化,因为100年一遇的流量对工程结构的破坏有一定的警示意义。 通过计算和分析,得出优化的体型能够保证水流对消力池底板的压力和临底流速在可承受范围内,不至于破坏底板。在一定程度上能减少对下游河道高速公路桥墩及公路的影响,但仍会对桥墩造成一定的破坏。因此,建议在工程实践中采用三角导流板分流,降低水流对公路桥墩的作用。
[Abstract]:In this paper, the RNG K- 蔚 turbulence model provided by the fluid calculation software fluent is used to track the free water surface by using the Vof method. Based on the stilling pool of a reservoir project, the scale of the model is 1: 100. Through numerical simulation, the corresponding engineering results are obtained, such as the flow state in the pool, the near bottom velocity, the hydrodynamic pressure of the bottom plate, and the pressure and velocity at the pier, etc. The emphasis of this paper is on how to reduce the influence of the outlet flow of the stilling pool on the bridge piers downstream of the reservoir. Therefore, the author puts forward the optimal design scheme of the stilling pool shape. The numerical simulation method is used to analyze whether the results (the effect of the flow out of the pond on the pier etc.) meet the practical requirements of the project. From the actual situation of the project and the research results of some scholars, we must start from three aspects to optimize the shape of the stilling pool: first, to control the bottom pressure of the stilling pool within a certain range (p120pa) 2, The critical bottom velocity of the stilling pool is controlled within a certain range (v0.6m/s), and the pressure and velocity of the bridge pier are controlled within a certain range (p100pa, v0.4m/s). In order to ensure that the impact of the flow of the stilling pool on the pier is reduced, the stilling pool itself does not cause too much damage. Therefore, the following three aspects, the system analysis of the optimization of the stilling pool shape after the calculation results meet the actual requirements of the project. In this paper, a two-dimensional model is used to calculate the infinite length of water from the stilling pool of the spillway to the infinite length of the downstream river. The calculated length is set at 67 cm, in which the width of the stilling pool is 10 cm. The axial line of the longitudinal section of the spillway is cancelled. Different types of stilling pool, flow pattern of flow upstream of pier, variation of pressure and velocity are calculated respectively. Then continuously optimize the shape of the stilling pool to see if it can meet the actual requirements of the project. The operating conditions under the flow rate of 100 years are selected and optimized, because the flow rate once in 100 years has a certain warning significance to the damage of the engineering structure. Through calculation and analysis, it is concluded that the optimized shape can ensure that the pressure and the flow velocity of the bottom plate of the stilling pool are within the tolerable range, so that the bottom plate will not be damaged. To some extent, it can reduce the influence on the pier and highway of the downstream river highway, but it will still cause some damage to the pier. Therefore, it is suggested that triangular diversion plate should be used in engineering practice to reduce the effect of water flow on highway piers.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV135.2;U442.3
本文编号：2358917
[Abstract]:In this paper, the RNG K- 蔚 turbulence model provided by the fluid calculation software fluent is used to track the free water surface by using the Vof method. Based on the stilling pool of a reservoir project, the scale of the model is 1: 100. Through numerical simulation, the corresponding engineering results are obtained, such as the flow state in the pool, the near bottom velocity, the hydrodynamic pressure of the bottom plate, and the pressure and velocity at the pier, etc. The emphasis of this paper is on how to reduce the influence of the outlet flow of the stilling pool on the bridge piers downstream of the reservoir. Therefore, the author puts forward the optimal design scheme of the stilling pool shape. The numerical simulation method is used to analyze whether the results (the effect of the flow out of the pond on the pier etc.) meet the practical requirements of the project. From the actual situation of the project and the research results of some scholars, we must start from three aspects to optimize the shape of the stilling pool: first, to control the bottom pressure of the stilling pool within a certain range (p120pa) 2, The critical bottom velocity of the stilling pool is controlled within a certain range (v0.6m/s), and the pressure and velocity of the bridge pier are controlled within a certain range (p100pa, v0.4m/s). In order to ensure that the impact of the flow of the stilling pool on the pier is reduced, the stilling pool itself does not cause too much damage. Therefore, the following three aspects, the system analysis of the optimization of the stilling pool shape after the calculation results meet the actual requirements of the project. In this paper, a two-dimensional model is used to calculate the infinite length of water from the stilling pool of the spillway to the infinite length of the downstream river. The calculated length is set at 67 cm, in which the width of the stilling pool is 10 cm. The axial line of the longitudinal section of the spillway is cancelled. Different types of stilling pool, flow pattern of flow upstream of pier, variation of pressure and velocity are calculated respectively. Then continuously optimize the shape of the stilling pool to see if it can meet the actual requirements of the project. The operating conditions under the flow rate of 100 years are selected and optimized, because the flow rate once in 100 years has a certain warning significance to the damage of the engineering structure. Through calculation and analysis, it is concluded that the optimized shape can ensure that the pressure and the flow velocity of the bottom plate of the stilling pool are within the tolerable range, so that the bottom plate will not be damaged. To some extent, it can reduce the influence on the pier and highway of the downstream river highway, but it will still cause some damage to the pier. Therefore, it is suggested that triangular diversion plate should be used in engineering practice to reduce the effect of water flow on highway piers.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV135.2;U442.3
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