本文關鍵詞：閘后跌坎對水流影響特性研究　出處：《鄭州大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 閘后跌坎 淹沒出流 k-ε湍流模型 VOF法 淹沒修正系數(shù)

【摘要】：閘門后存在跌坎情況下的水流出流流態(tài)問題在實際工程中得到了廣泛的應用。分析研究出閘門后存在跌坎情況下的淹沒出流判別條件、淹沒出流流態(tài)特點和淹沒系數(shù)合理的確定方法,對工程實際應用和學術理論研究都有很大的作用和價值。但目前還沒有完善的能確定由跌坎產生的淹沒修正系數(shù)的系統(tǒng)取值。本論文首先列舉出目前的對閘后存在跌坎情況下的閘孔淹沒出流問題的處理方法,認為目前存在的淹沒出流的判別方法和淹沒系數(shù)的計算方式,將水平底板上的閘孔淹沒出流的判別和淹沒系數(shù)的確定方式直接應用到閘后存在跌坎情況是不正確的。提出了引入淹沒修正系數(shù)β=h'/hc"的方式,給出了針對平底坎閘孔出流淹沒判別的精確方法和修正后的淹沒系數(shù)確定方法。然后采用數(shù)值模擬的方法進行計算,運用標準k-ε湍流數(shù)學模型,用VOF法追蹤液體自由表面,并采用氣液兩相流的計算模型,建立了二維的閘后存在跌坎情況下的數(shù)值模型。分別以d/e、l/e為變量,根據(jù)工程中常用的閘后跌坎尺寸,選取d/e分別等于0.2、0.4、0.6、0.8、1、2六種情況,選取l/e分別等于1、2、3、4、5、6、7、8、9、10十種情況,共60種情況建立數(shù)值模型,對閘后存在跌坎情況下的淹沒出流進行數(shù)值計算,得出的流場流態(tài)、流速分布隨跌坎相對高度d/e、相對長度l/e的變化規(guī)律與理論分析規(guī)律基本一致。即通過對實際工程可能出現(xiàn)的各種尺寸的閘底坎的閘孔淹沒出流進行了有序的系統(tǒng)的模擬計算研究,給出了有底坎的閘孔淹沒出流淹沒修正系數(shù)的β值與d/e、l/e的對應關系,為實際工程應用提供了依據(jù)。最后將數(shù)值模擬計算結果分別與經典的實驗數(shù)據(jù)和本校實驗室的實驗數(shù)據(jù)進行了對比,數(shù)值模擬計算結果與這兩組實驗數(shù)據(jù)吻合度都較高。充分說明數(shù)值模擬方法可以應用于計算實際工程中明渠閘后存在跌坎情況下的湍流流場流態(tài)和流速分布等。本論文的研究結果可以直接應用于閘后存在跌坎情況下的淹沒出流水力計算,為工程實際應用提供了依據(jù),并為完善閘后存在跌坎情況下的閘孔淹沒出流判別方式做出了重要貢獻。
[Abstract]:The problem of water outflow flow behind the sluice is widely used in the practical engineering. The condition of the submergence and outflow is analyzed and studied in the case of the fall behind the sluice gate. The method of determining the characteristics of submerged outflow flow and the reasonable submergence coefficient. It has great effect and value to engineering practical application and academic theory research. But at present, there is no perfect system value that can determine the submergence correction coefficient produced by falling ridge. Firstly, this paper enumerates the current back storage of gate. The method to deal with the problem of sluice hole inundation and outflow under the condition of fall. It is considered that the existing method of distinguishing submergence discharge and calculating method of submergence coefficient. It is not correct to apply the judgment of the sluice hole on the horizontal bottom plate and the way of determining the submergence coefficient directly to the situation where the sluice falls after the sluice. The method of introducing the submergence correction coefficient 尾 / hc "is put forward. The accurate method and the modified method of determining the submergence coefficient of flat bottom sluice hole are given. Then the numerical simulation method is used to calculate and the standard k- 蔚 turbulence mathematical model is used. Using the VOF method to track the free surface of the liquid and using the gas-liquid two-phase flow calculation model, a two-dimensional numerical model with D / E / L / e as the variable is established. According to the commonly used size of the sluice, d / e = 0.2g / e = 0.2g / e = 0.6g / e = 0.6g / e = 0.8U / e = 0.2g / e = 0.2g / e = 1g / e = 1g / e = 1g / e = 1g / e = 1 / 2g / e respectively. A numerical model was established for 60 cases in 10 cases, and the flow pattern was obtained by numerical calculation of the submerged discharge flow in the case of a falling ridge behind the sluice. The velocity distribution varies with the relative height d / e of the ridge. The variation of the relative length of l / e is basically consistent with the theoretical analysis, that is, through the systematic simulation and calculation of the inundation and outflow of the sluice bottom sill of various sizes that may occur in the actual engineering. The corresponding relation between the correction coefficient of submergence and submergence coefficient of sluice hole with bottom ridge and D / E / 1 / e is given. Finally, the numerical simulation results are compared with the classical experimental data and the experimental data of our laboratory. The results of numerical simulation are in good agreement with these two groups of experimental data. It is fully demonstrated that the numerical simulation method can be used to calculate the turbulent flow field and velocity distribution in the case of open channel sluice in actual engineering. The results of this paper can be directly applied to the hydraulic calculation of submerged discharge under the condition that there is a dip in the back of the sluice. It provides a basis for practical application and makes an important contribution to the improvement of the way of judging the flood discharge of sluice hole under the condition of falling sluice after the sluice.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV135

【相似文獻】

相關期刊論文 前10條

1 袁新明,洪家寶;平底板水閘閘孔淹沒出流的判別和流量計算[J];揚州大學學報(自然科學版);1998年03期

2 陳美杏;;廣東某水利樞紐工程攔河閘壩閘孔設計[J];科技信息;2011年12期

3 杜嶼,戴榮法,張世聞;閘孔流量系數(shù)綜合分析[J];水文;1997年05期

4 李日渺，李藎花;高壩平板閘門閘孔恒定自由出流流量系數(shù)研究[J];武漢水利電力大學學報;1996年06期

5 王涌泉;;X檣峽琢饗凳齕J];水利學報;1958年03期

6 張志昌;李若冰;趙瑩;傅銘煥;;消力坎式消力池淹沒系數(shù)和坎高的計算[J];長江科學院院報;2013年11期

7 張迎春;自由臨界水躍躍后水深的探討[J];水利水電科技進展;2000年04期

8 朗黎明,冷軍,張振英;寬頂堰淹沒系數(shù)的數(shù)學模型[J];黑龍江水專學報;1999年02期

9 李春利;李建慈;劉繼東;張仂;劉長江;李彥芬;;用VOF法模擬導向立體傳質塔板罩內兩相流[J];化工學報;2007年04期

10 張廣海;王立平;胡明俠;;閘門下泄流量淹沒系數(shù)б_s的選取方法[J];東北水利水電;2007年09期

相關會議論文 前1條

1 張迎春;;自由臨界水躍躍后水深的探討[A];新世紀 新機遇 新挑戰(zhàn)——知識創(chuàng)新和高新技術產業(yè)發(fā)展（下冊）[C];2001年

相關碩士學位論文 前3條

1 高珊珊;閘后跌坎對水流影響特性研究[D];鄭州大學;2017年

2 覃閃;彎道水流對閘孔挑射泄流影響的研究[D];三峽大學;2015年

3 劉亞云;寬頂堰上閘孔淹沒出流的特性研究[D];鄭州大學;2007年

，

本文編號：1362495