三河口水利樞紐泄洪建筑物水力特性研究
[Abstract]:In recent years, a large number of super-high dam projects with high water head, large discharge capacity and high flood discharge power have been built in the mountainous canyon area of southwest China, which has exposed a series of problems, such as the problem of geological landslide along the banks caused by water storage in the upper reaches of the hub. The serious atomization in the downstream of the hub will cause the slope stability of the downstream channel and the serious local scour and scour along the downstream channel. Therefore, according to the specific project location and characteristics, reasonable design of flood discharge building layout, optimization of flood discharge building shape, to ensure the safe operation of the hub project and normal benefit play a very important significance. In this paper, the hydraulic characteristics of the original design scheme and the recommended scheme of the drainage structure are studied through physical model test, taking Sanhekou water conservancy project, a central project of the diversion of Han Jiwei project, as the research object, and the RNG k-? The turbulent model and VOF model are used to simulate the hydraulic characteristics of the narrow slit and the fluctuating pressure of the bottom plate of the middle surface hole. The main research results are as follows: (1) the original scheme table and the discharge capacity of the bottom hole meet the design requirements; The horizontal diffusion of the water tongue in the surface hole is sufficient and the water tongue in the bottom hole is well pulled out in the longitudinal direction; the water tongue in the middle hole falls farthest, and the water tongue diffuses in a single layer, and the distance between the water tongue of the left and right surface holes is slightly small, and the water tongue is diffused in the front and rear layers. The main problems existing in the original design scheme are: the end point of the water tongue of the two bottom holes is near and it is not completely separated; the left surface hole and the middle surface hole water tongue often hit the water cushion pond slope; when checking the water level, The impact pressure on the bottom plate of the local water cushion pond exceeds the requirement of 15 脳 9.8kPa, and at the moment of the gate opening and closing, there is a drop of water at the right corner of the left surface hole to the right of the drain hole. (2) the recommended scheme solves the problems of the original scheme. However, the local pulsating pressure intensity of the bottom plate is larger because of the crossing of the water tongue on the left and right surface holes. Under the condition that the water tongue of the surface hole has been fully diffused, the suggestion and implementation scheme of increasing the depth of the downstream water cushion to reduce the pulsating pressure intensity of the bottom plate of the water cushion pond are put forward. (3) the narrow slit of the bottom hole of the flood spillway, the length of the longitudinal inlet water, is obtained by simulation. (4) the simulated mean value of pulsating pressure, the intensity of pulsating pressure, the distribution of probability density and power spectrum density are in good agreement with the results of physical model test. It is feasible to use numerical simulation method to study the fluctuating pressure of the bottom plate of water cushion pond.
【學位授予單位】:西北農(nóng)林科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TV135.2
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