抽水蓄能电站下库放空管出口消能水工模型试验研究

发布时间：2018-07-07 11:47

本文选题：扭鼻坎 + 明渠　；参考：《浙江大学》2014年硕士论文

【摘要】：变水头泄流工程的一个普遍问题是消能结构的适应性,要求在不同水头下,泄流量及消能效果均能满足设计要求。如何有效的解决不同水头工况下的消能效果是变水头泄流工程广泛存在的工程难题。本文以实际工程中存在变水头消能问题为研究对象,根据工程设计单位提供的基本资料,在实验室建立水工模型。通过模型试验,首先对压力管道段、孔口段、明渠鼻坎段及下游冲刷等进行水力学特性试验研究,然后根据消能原理和工程的实际情况,选定了本工程挑流消能的鼻坎型式,并进行了修改方案的试验,最终为该工程提出了合适的鼻坎布置及尺寸。本文提出了一种用于弯道消能工型式——扭鼻坎+导流墙。从扭鼻坎下游的水流流态、水流流速分布情况、挑流水舌落点、挑流段边墙水深分布等方面对扭鼻坎的消能防冲效果进行了论证。本文在闸后明渠弯段设置扭鼻坎及导流墙,由于扭鼻坎的作用,挑流水舌偏离河槽现象消除,水舌落点得到明显改善,而且不同水头下挑流流态均较好,导流墙对水流的归槽起到了很好的辅助作用。
[Abstract]:The adaptability of energy dissipation structure is a common problem in variable head discharge engineering. It is required that discharge and energy dissipation effect can meet the design requirements under different water heads. How to effectively solve the energy dissipation effect under different head conditions is a widespread engineering problem in variable head discharge projects. In this paper, based on the basic data provided by the engineering design unit, the hydraulic engineering model is established in the laboratory, taking the problem of energy dissipation with variable head in practical engineering as the research object. Through the model test, the hydraulic characteristics of the pressure pipeline section, the orifice section, the open channel nose ridge section and the downstream scour are studied first. Then, according to the principle of energy dissipation and the actual situation of the project, the type of the nose sill for the energy dissipation of the project is selected. The modified scheme was tested, and the proper nasal ridge arrangement and size were put forward for the project. In this paper, a new type of energy dissipator for bend-torsion nose drain wall is presented. In this paper, the energy dissipation and anti-scour effect of the torsional nose bar is demonstrated from the following aspects: the flow pattern, the distribution of the flow velocity, the drop point of the tongue and the distribution of the water depth of the side wall of the slug. In this paper, torsional noses and diversion walls are set up in the curved section of the open channel behind the sluice. Because of the effect of the torsional nostrils, the phenomenon of water tongue deviation from the channel is eliminated, the drop point of the water tongue is obviously improved, and the flow patterns under different water head are better. The diversion wall plays a good role in assisting the return of the current.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV131.61

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