本文選題：非對(duì)稱型匯流口　切入點(diǎn)：復(fù)式斷面地形　出處：《西安理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：干支流相互頂托摻混使交匯口附近流場(chǎng)、水深、泥沙沖淤等水力因素發(fā)生變化,出現(xiàn)螺旋流、二次流、局部水流停滯、分離和水面凸起諸多獨(dú)特復(fù)雜的水力現(xiàn)象,導(dǎo)致堤岸沖刷、泥沙局部淤積,影響污染物的擴(kuò)散與運(yùn)輸,故交匯河段水流水力特性的研究具有重大意義。本文對(duì)干支流匯流區(qū)段水流結(jié)構(gòu)進(jìn)行了理論分析,建立交匯角為45°非對(duì)稱型清水定床水槽,在不同的地形條件和匯流比下設(shè)定八種工況進(jìn)行模型試驗(yàn)。運(yùn)用ANSYS ICEM對(duì)水槽進(jìn)行三維建模,利用FLUENT軟件(選用RNG k-ε模型、QUICK格式離散、SIMPLEC算法耦合壓力速度、VOF法捕捉自由表面)對(duì)交匯角為45°時(shí)兩種地形下匯流比分別為1:1、1:2、1:3、1:4各工況以及交匯角度分別為30°、60°、90°的三種工況進(jìn)行了模擬,分析了不同地形、不同匯流比、不同入?yún)R角時(shí)非對(duì)稱干支流交匯口水流特性規(guī)律,得出以下結(jié)論:(1)干流測(cè)壓管水頭沿程變化較緩,但支流匯入會(huì)造成交匯口處流速水頭增大,測(cè)壓管水頭降低。(2)復(fù)式地形斷面水流紊動(dòng)強(qiáng)烈,水面線波動(dòng)較大;受鋪設(shè)地形的約束作用,水流動(dòng)力軸線偏向水槽中心,分離區(qū)范圍縮小。(3)匯流比1:3時(shí)水流動(dòng)力軸線靠近水槽中心線,對(duì)左右岸沖刷均最小;交匯角為45°時(shí)各個(gè)斷面流速變化梯度小,水流動(dòng)力軸線靠近水槽中心線,對(duì)兩岸沖刷最小。(4)交匯角為90°時(shí)交匯口上游壅水嚴(yán)重,下游流速變大,分離區(qū)范圍變大,能量損耗最大。
[Abstract]:The flow field, water depth, sediment scour and silt and other hydraulic factors in the vicinity of the intersection are changed due to the mixing of the top support and the top support of the main tributaries, resulting in helical flow, secondary flow, partial water flow stagnation, separation and many unique and complex hydraulic phenomena of the water surface protruding. As a result of levee erosion, local siltation of sediment and influence on the diffusion and transportation of pollutants, it is of great significance to study the hydraulic characteristics of the flow in the intersection reach. This paper makes a theoretical analysis of the flow structure in the confluence section of the trunk and tributaries. A 45 擄unsymmetrical clear water fixed bed flume with an intersection angle of 45 擄was established. The model tests were carried out under different topographic conditions and flow concentration ratios. ANSYS ICEM was used to model the flume. Using FLUENT software (using RNG k- 蔚 model / quick scheme to discretize SIMPLEC algorithm coupling pressure velocity and VOF method to capture free surface), three kinds of confluence ratio of 1: 1 / 1 / 2 / 2: 1 / 3 / 1 / 4 and 30 擄60 擄/ 90 擄angle of intersection are used in two different terrain when the angle of intersection is 45 擄, respectively, of which the confluence ratio is 1: 1 / 1 / 2: 1 / 3 / 1 / 4 and the angle of intersection is 30 擄60 擄/ 90 擄respectively. The operating conditions are simulated. The characteristics of water flow at the intersection of asymmetric tributaries with different topography, different confluence ratios and different entrances angles are analyzed. The following conclusions are drawn: 1) the water head of the main stream pressure measuring pipe changes slowly along the path, but the flow velocity head at the junction increases when the branch flows into the channel. The water head of the pressure measuring pipe is lowered. 2) the flow of the complex topographic section is turbulent and the water surface line fluctuates greatly, and the axis of the water power is inclined to the center of the flume because of the constraint of the laid terrain. At 1: 3, the flow power axis is close to the center line of the flume, and it is the smallest to the left and right bank scour, and the gradient of the velocity of each section is small when the intersection angle is 45 擄, and the axis of the flow power is close to the central line of the flume. When the intersection angle is 90 擄, the upstream backwater is serious, the downstream velocity is larger, the separation area is larger, and the energy loss is the largest.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV133;TV148

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