三維VOF模型在臺階式溢洪道中的應(yīng)用研究
[Abstract]:In the construction of water conservancy projects, drainage structures must be set up. The stepped spillway is a well-used drainage structure in water conservancy works, which is used to regulate the flood which can not be contained in the reservoir to ensure the safety of the dam. The stepped spillway should not only satisfy the sufficient discharge capacity, but also ensure the safety performance of the stepped spillway and no destructive effect between the discharge flow and the original channel. Qinghai Province, located in the cold high altitude region of northwest China, is rich in hydropower resources. In the cold area of high altitude, the study of hydraulic characteristics of stepped spillway has an indelible significance to prevent cavitation and cavitation of dam surface. In this paper, the three-dimensional numerical simulation of stepped spillway is carried out by using VOF method, combined with RNG 魏-蔚 two-equation turbulence model and unidirectional fluid free tracing interface. The development process of RNG 魏-蔚 two-path turbulence model is summarized. The application status of numerical simulation technology is introduced. By adjusting the plane arrangement, step series and step size of the stepped spillway, the flow pattern of the stepped spillway is analyzed. Water line? Velocity? Hydraulic characteristics such as pressure and energy dissipation rate are analyzed. The results show that the flow pattern of the stepped spillway is divided into transitional water flow patterns. Falling water flow and sliding water flow. When there is a transition section, the water flow is affected by weightlessness, and the water surface line decreases sharply at the initial step, and then rises gradually. Due to the reaction of the bottom plate of the stilling pool, the water surface line suddenly increases, and the water surface line tends to be stable after the flow reaches the stable state. When falling water flow, the direction of flow velocity at the concave corner of the step and the horizontal plane of the step form 45 擄angle, while the direction of velocity on the surface of the water body is parallel to the line of the outer edge of the step, and the swirl triangle area of the flow in the step is formed. After increasing the flow rate, the positive pressure of a single step increases, the maximum of the positive pressure is at 0.8 times the step length, the maximum point of negative pressure on the vertical surface of the step is easily within the top range of the step, and the negative pressure range accounts for the proportion of 50 to 65 percent of the step.
【學(xué)位授予單位】:青海大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TV135.2
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