本文選題：弧形閘門 + VOF　； 參考：《北方工業(yè)大學(xué)》2014年碩士論文

【摘要】：進口測控一體弧形閘門存在安裝條件苛刻、價格昂貴、很難適應(yīng)泥沙含量大的黃河水灌溉渠系等問題,迫切需要開發(fā)適合我國國情的測控一體弧形閘門。掌握過閘水流的水力特性,是成功開發(fā)測控一體弧形閘門的基礎(chǔ)。本文基于流體動力學(xué)(Computational Fluid Dynamics, CFD)理論和Fluent軟件模擬技術(shù),對過閘水流的流動特性進行仿真分析。 本文采用Pro-E軟件建立弧形閘門計算域三維實體模型,應(yīng)用Fluent的前處理軟件Gambit劃分網(wǎng)格,借助Fluent軟件中的k-ε湍流模型、VOF水氣二相流模型以及壓力速度耦合方式,對不同閘前水位、閘門開度以及不同渠道結(jié)構(gòu)時的30種工況,進行過閘水流的仿真模擬,得到水流的水氣二相圖、沿程水位圖、速度矢量圖以及渠底所受壓力曲線等。 仿真結(jié)果表明：對于目前應(yīng)用的灌溉水渠,閘前水位在0.25m-1.5m之間保持某固定值不變時,當(dāng)閘門開度在45°到84°之間逐漸增大,或閘門開度為45°-84°保持某固定值不變,閘前水位由1.5m到0.25m逐漸降低時,在閘門底部產(chǎn)生的渦旋逐漸減小；當(dāng)閘前水位為1.5m,閘門開度由45°增加到84°時,閘后渠底所受壓力的波動范圍由22Pa增加到200Pa,閘后水流流速由2.97m/s降低到1.38m/s；當(dāng)閘門開度為84°,閘前水位由1.5m降低到0.25m時,閘后水流流速由1.38m/s降低到1.29m/s。 為減少閘門底部的泥沙堆積,降低過閘水流流速,提高水流流動的穩(wěn)定性,提出在閘后1.5m處修建長、寬和深度分別為4.5m、1.81m和0.35m的消力池,并將閘后矩形渠長度增加為14.5m的改進方案,計算結(jié)果表明：該方案可使閘門底部的泥沙堆積在消力池中,降低泥沙堆積對閘門啟閉造成的影響；過閘水流變得穩(wěn)定,閘前與閘后水流流速分別比改進前降低了4.76%～12.12%與12.41%-59.76%；閘后水流對渠底的沖擊力降低了30.15%；閘前與閘后渠底所受壓力穩(wěn)定的區(qū)域,分別為閘前0.7m～1.5m,閘后10m-12m,閘后壓力波動幅度由改進前的大于1000Pa降低為40Pa,在此范圍內(nèi)安裝壓力傳感器,有利于提高過閘水流流量的測量精度。通過與消力池深度分別為0.25m和0.45m的渠道修建方案進行對比,證明了該改進方案的合理性。 采用CFD技術(shù)仿真分析過閘水流流態(tài),對弧形閘門安裝位置渠道的結(jié)構(gòu)設(shè)計、壓力傳感器安裝位置的選擇,具有一定的理論指導(dǎo)意義。
[Abstract]:The imported integrated arc gate is difficult to adapt to the Yellow River irrigation canal system with high sediment content because of its harsh installation conditions and high price. Therefore, it is urgent to develop the integrated arc gate suitable for the situation of our country. Mastering the hydraulic characteristics of sluice flow is the foundation of successfully developing the integrated arc gate. Based on the theory of Computational Fluid Dynamics (CFDs) and Fluent software simulation technology, the flow characteristics of sluice flow are simulated and analyzed in this paper. In this paper, the three-dimensional solid model of arc gate is established by using Pro-E software, and the pre-processing software Gambit of Fluent is used to divide the grid. With the help of k- 蔚 turbulence model in Fluent software, the two-phase flow model of water and gas and the coupling mode of pressure and velocity, the water levels in front of different gates are analyzed. The gate opening and 30 working conditions of different channel structures are simulated, and the two phase diagram, water level diagram, velocity vector diagram and pressure curve at the bottom of the channel are obtained. The simulation results show that when the water level in front of sluice remains constant between 0.25m-1.5m and irrigation canal, the opening of gate increases gradually between 45 擄and 84 擄, or the opening of gate keeps a fixed value between 45 擄-84 擄. When the water level in front of the gate decreases from 1.5 m to 0.25 m, the vortex produced at the bottom of the gate decreases gradually, and when the water level in front of the gate is 1.5 m, the opening degree of the gate increases from 45 擄to 84 擄. The fluctuation range of the pressure at the bottom of the sluice is increased from 22Pa to 200Pa. the velocity of flow behind the sluice decreases from 2.97m/s to 1.38m / s, and when the opening of the gate is 84 擄and the water level before the sluice is reduced from 1.5m to 0.25 m, the flow velocity behind the sluice decreases from 1.38m/s to 1.29ms. In order to reduce the sediment accumulation at the bottom of the gate, reduce the flow velocity and improve the stability of the flow, a stilling tank with a length, width and depth of 1.81 m and 0.35 m is constructed at 1.5 m behind the gate, respectively, in order to reduce the sediment accumulation at the bottom of the gate, and to improve the stability of the flow flow. The improved scheme of increasing the length of the rectangular canal behind the gate to 14.5m shows that the scheme can make the sediment at the bottom of the gate accumulate in the stilling pool, reduce the influence of sediment accumulation on the gate opening and closing, and the flow through the gate becomes stable. The velocity of flow before and after the sluice is 4.7612% and 12.41% lower than that before the improvement, respectively; the impact force of the flow behind the sluice on the bottom of the channel is reduced by 30.15%; and the area where the pressure on the bottom of the canal before and after the sluice is stable, The pressure fluctuation amplitude is reduced from greater than 1000Pa to 40 Pa. the pressure sensor is installed in this range, which is helpful to improve the accuracy of flow flow measurement. Compared with the channel construction scheme with the depth of 0.25m and 0.45m respectively, the rationality of the improved scheme is proved. Using CFD technology to simulate and analyze the water flow state of the gate is of theoretical significance to the structural design of the installation channel of the arc gate and the selection of the installation position of the pressure sensor.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV663.2

【參考文獻】

相關(guān)期刊論文 前10條

1 楊京廣;把多鐸;林勁松;童星;;河床式電站大壩泄洪流場的三維數(shù)值模擬[J];長江科學(xué)院院報;2009年08期

2 尤鳳龍;劉亞坤;倪漢根;;底流消能中溢流壩體型對消力池的影響[J];水利與建筑工程學(xué)報;2011年03期

3 曹永娣;杜明俠;李輝;柏春良;;FLUENT在發(fā)動機工作過程數(shù)值模擬中的應(yīng)用[J];華北水利水電學(xué)院學(xué)報;2012年02期

4 劉小平;張敏;劉晶;許彬;;商用軟件GAMBIT的解析和應(yīng)用[J];南京工業(yè)大學(xué)學(xué)報(自然科學(xué)版);2008年01期

5 潘小強,袁王景;CFD軟件在工程流體數(shù)值模擬中的應(yīng)用[J];南京工程學(xué)院學(xué)報(自然科學(xué)版);2004年01期

6 朱榮生,李維斌,黃道見,曹衛(wèi)東;泵站出水流道的數(shù)模分析[J];農(nóng)機化研究;2003年03期

7 段立君;張廣勝;;我國農(nóng)業(yè)核心競爭力分析[J];農(nóng)業(yè)經(jīng)濟;2008年12期

8 王倩;;關(guān)于采用水力自控翻板門水閘的過流能力及消能防沖的探討[J];湖南水利水電;2010年02期

9 鄭源;劉文明;黃細彬;李高會;黃渝桂;;平原泵閘工程消力池CFD水力優(yōu)化[J];排灌機械;2009年01期

10 鄭源;肖玉平;劉文明;黃昱;;大型豎井式貫流泵裝置的數(shù)值模擬與性能預(yù)測[J];排灌機械;2009年06期

，

本文編號：1798650