發(fā)布時間：2019-06-10 10:04

【摘要】：低佛氏數(shù)水躍常存在低水頭水利工程中，其特點是沒有明顯的波狀水躍，消能效率比較低，不僅影響了水利工程的正常運行，而且對河床侵蝕比較嚴(yán)重。因此如何優(yōu)化消能工的消能型式是低水頭水利工程的亟需解決的問題之一。 結(jié)合工程實例作為低水頭消能工做數(shù)值模擬研究，首先對國內(nèi)外的研究進(jìn)行了回顧，之后為了研究如何提高消能效率，本文提出了一種新型的懸柵消能工，采用幾何重構(gòu)的VOF法和k-ε紊流模型相耦合的計算模型來對提出的多種新型懸柵消能工的水氣兩相流進(jìn)行數(shù)值模擬，并將它們與傳統(tǒng)的SAF型消能工在消能效果、流態(tài)分布等方面進(jìn)行比較分析，從中獲得消能效果相對較好的新型懸柵消能工。懸柵消能工豐富了底流消力池輔助消能工的選擇型式。懸柵的設(shè)置位置、懸置高度、柵條與陡坡夾角是影響懸柵消能主要三個因素，所以本文對這三個方面進(jìn)行優(yōu)化設(shè)計來提高消能效率。根據(jù)池長縮短的情況下，將其與傳統(tǒng)消能工進(jìn)行消能防沖比較分析，對實際工程的建設(shè)提供了理論基礎(chǔ)和參考條件。 模擬研究表明：懸柵消能工能夠較好的應(yīng)用于底流消力池，，在低佛氏數(shù)的水流條件下，相比較傳統(tǒng)型，新型懸柵消能工有較好的消能效果，而且新型懸柵消能工結(jié)構(gòu)簡單，施工方便，在含沙量比較大的低水頭工程可以推廣使用。
[Abstract]:Low Fahrenheit water jump often exists in low head water conservancy project, which is characterized by no obvious wavy water jump and low energy dissipation efficiency, which not only affects the normal operation of water conservancy project, but also seriously erodes the river bed. Therefore, how to optimize the energy dissipation type of energy dissipators is one of the urgent problems to be solved in low head water conservancy projects. Combined with an engineering example, the numerical simulation of low head energy dissipator is carried out. Firstly, the research at home and abroad is reviewed. Then, in order to study how to improve the energy dissipation efficiency, a new type of suspended grid energy dissipator is proposed in this paper. The numerical simulation of water-gas two-phase flow of various new suspended gate energy dissipators is carried out by using the coupled calculation model of geometric reconstruction VOF method and k-蔚 turbulence model, and they are compared with the traditional SAF type energy dissipator. The flow pattern distribution is compared and analyzed, and a new type of suspended grid energy dissipator with relatively good energy dissipation effect is obtained. The suspended grid energy dissipator enriches the selection type of the auxiliary energy dissipator in the bottom flow stilling pool. The setting position, height and angle between the grid and the steep slope are the three main factors that affect the energy dissipation of the suspended grid, so this paper optimizes the design of these three aspects to improve the energy dissipation efficiency. According to the condition of shortening the pool length, the energy dissipation and scour prevention of the traditional energy dissipator is compared and analyzed, which provides the theoretical basis and reference conditions for the construction of the actual project. The simulation results show that the suspended grid energy dissipator can be well applied to the bottom flow stilling pool. Under the condition of low Fahrenheit number, compared with the traditional type, the new suspended grid energy dissipator has better energy dissipation effect, and the structure of the new suspended grid energy dissipator is simple. The construction is convenient and can be popularized in the low head project with large sediment concentration.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV653;TV135.2

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