本文選題：扭鼻坎 + 明渠　； 參考：《浙江大學(xué)》2014年碩士論文

【摘要】：變水頭泄流工程的一個(gè)普遍問題是消能結(jié)構(gòu)的適應(yīng)性,要求在不同水頭下,泄流量及消能效果均能滿足設(shè)計(jì)要求。如何有效的解決不同水頭工況下的消能效果是變水頭泄流工程廣泛存在的工程難題。 本文以實(shí)際工程中存在變水頭消能問題為研究對(duì)象,根據(jù)工程設(shè)計(jì)單位提供的基本資料,在實(shí)驗(yàn)室建立水工模型。通過模型試驗(yàn),首先對(duì)壓力管道段、孔口段、明渠鼻坎段及下游沖刷等進(jìn)行水力學(xué)特性試驗(yàn)研究,然后根據(jù)消能原理和工程的實(shí)際情況,選定了本工程挑流消能的鼻坎型式,并進(jìn)行了修改方案的試驗(yàn),最終為該工程提出了合適的鼻坎布置及尺寸。 本文提出了一種用于彎道消能工型式——扭鼻坎+導(dǎo)流墻。從扭鼻坎下游的水流流態(tài)、水流流速分布情況、挑流水舌落點(diǎn)、挑流段邊墻水深分布等方面對(duì)扭鼻坎的消能防沖效果進(jìn)行了論證。 本文在閘后明渠彎段設(shè)置扭鼻坎及導(dǎo)流墻,由于扭鼻坎的作用,挑流水舌偏離河槽現(xiàn)象消除,水舌落點(diǎn)得到明顯改善,而且不同水頭下挑流流態(tài)均較好,導(dǎo)流墻對(duì)水流的歸槽起到了很好的輔助作用。
[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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV131.61

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