侧槽溢洪道水力特性模型试验与数值模拟研究

发布时间：2019-03-04 20:42

【摘要】：为研究侧槽溢洪道的水力特性,下游冲刷等问题,本文针对侧槽溢洪道进行物理模型试验并采用试验得到的参数对工程原型进行了数值模拟研究,分析了侧槽溢洪道中的流态、水面线、压强、流速、下游冲刷等内容,其成果可为类似工程提供参考。论文的主要研究成果如下:(1)各种工况下的泄量值均大于设计值，，溢洪道泄量满足要求;侧堰的流量系数随水头增加缓慢变大,其值在0.385-0.499之间。(2)侧堰段、侧槽段、抛物段、直线斜坡段及反弧段断面满足过流要求:溢洪洞陡坡隧洞段断面不满足要求;明渠段边墙高度满足要求;挑坎段右边墙高度不足,需局部加高。溢洪道泄槽段最小水流空化数出现在反弧段末端附近,最小约为0.97～1.16,该段最大点流速约为16.4m/s,未超过30m/s。(3)挑流鼻坎原体型下冲刷坑上游坡比陡于1/2.5,不满足消能要求并且挑射水流对对岸山包根部直接冲刷严重。挑流鼻坎4个优化体型中的挑射水流均能避免直接冲刷挑坎对岸的山包根部,后三种体型中的挑射水舌的横向扩散程度较原体型均有明显的增大。综合比较结果为优化体型3中舌形挑坎体型和水力参数最优。(4)文章用Fluent软件对侧槽溢洪道中水流进行了模拟,从所选取的流段的水流的流态、水面线、断面流速、压强比较来看,数值模拟的结果总体来说与模型试验的结果符合度比较高,说明文章模拟所采用的的方法合适。
[Abstract]:In order to study the hydraulic characteristics and the downstream erosion of the side-channel spillway, the physical model test of the side-channel spillway is carried out, and the numerical simulation of the prototype is carried out using the parameters obtained from the experiment, and the flow pattern, the water surface line, the pressure and the flow rate in the side-tank spillway are analyzed. Downstream scour, etc., the results can be referred to for similar projects. The main research results of the paper are as follows: (1) The discharge value under various working conditions is greater than the design value, and the spillway discharge capacity meets the requirements; the flow coefficient of the side weir is increased slowly with the increase of the water head, and the value is between 0.385 and 0.499. (2) The section of the side dam section, the side groove section, the parabolic section, the straight slope section and the anti-arc section meet the over-current requirements: the section of the section of the section of the steep slope of the spillway tunnel does not meet the requirements; the height of the side wall of the open channel section meets the requirements; the height of the right wall of the bucket section is insufficient, and the section is required to be locally increased. The minimum water flow cavitation number of the spillway section of the spillway is near the end of the arc section, with a minimum of about 0.97-1.16, the maximum point flow rate of the section is about 16.4 m/ s and not more than 30 m/ s. (3) The slope ratio of the upstream slope of the scour hole under the nose and the nose is 1/ 2.5, the energy dissipation requirement is not met, and the water jet is directly flushed to the root of the bank of the other bank. The water flow in the four optimized integrated types of the nose cone can avoid the direct flushing of the root of the mountain bag on the other side of the bucket, and the degree of lateral diffusion of the ejection water tongue in the three body types is larger than that of the original body. The result of the comprehensive comparison is that the shape of the tongue-like shape and the hydraulic parameters of the optimized body 3 are the best. (4) The water flow in the spillway of the opposite side of the Fluent software is simulated, and the results of the numerical simulation are as high as the result of the model test from the flow pattern, the water surface line, the section flow rate and the pressure comparison of the selected flow section. It is indicated that the method is suitable for the simulation of the article.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV135.2

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