【摘要】：為研究側(cè)槽溢洪道的水力特性,下游沖刷等問題,本文針對側(cè)槽溢洪道進(jìn)行物理模型試驗(yàn)并采用試驗(yàn)得到的參數(shù)對工程原型進(jìn)行了數(shù)值模擬研究,分析了側(cè)槽溢洪道中的流態(tài)、水面線、壓強(qiáng)、流速、下游沖刷等內(nèi)容,其成果可為類似工程提供參考。論文的主要研究成果如下:(1)各種工況下的泄量值均大于設(shè)計(jì)值，，溢洪道泄量滿足要求;側(cè)堰的流量系數(shù)隨水頭增加緩慢變大,其值在0.385-0.499之間。(2)側(cè)堰段、側(cè)槽段、拋物段、直線斜坡段及反弧段斷面滿足過流要求:溢洪洞陡坡隧洞段斷面不滿足要求;明渠段邊墻高度滿足要求;挑坎段右邊墻高度不足,需局部加高。溢洪道泄槽段最小水流空化數(shù)出現(xiàn)在反弧段末端附近,最小約為0.97～1.16,該段最大點(diǎn)流速約為16.4m/s,未超過30m/s。(3)挑流鼻坎原體型下沖刷坑上游坡比陡于1/2.5,不滿足消能要求并且挑射水流對對岸山包根部直接沖刷嚴(yán)重。挑流鼻坎4個優(yōu)化體型中的挑射水流均能避免直接沖刷挑坎對岸的山包根部,后三種體型中的挑射水舌的橫向擴(kuò)散程度較原體型均有明顯的增大。綜合比較結(jié)果為優(yōu)化體型3中舌形挑坎體型和水力參數(shù)最優(yōu)。(4)文章用Fluent軟件對側(cè)槽溢洪道中水流進(jìn)行了模擬,從所選取的流段的水流的流態(tài)、水面線、斷面流速、壓強(qiáng)比較來看,數(shù)值模擬的結(jié)果總體來說與模型試驗(yàn)的結(jié)果符合度比較高,說明文章模擬所采用的的方法合適。
[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.
【學(xué)位授予單位】：西安理工大學(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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