低佛氏數(shù)消力池三維紊流數(shù)值模擬
[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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