本文關(guān)鍵詞：閘后跌坎對(duì)水流影響特性研究　出處：《鄭州大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

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

【摘要】：閘門(mén)后存在跌坎情況下的水流出流流態(tài)問(wèn)題在實(shí)際工程中得到了廣泛的應(yīng)用。分析研究出閘門(mén)后存在跌坎情況下的淹沒(méi)出流判別條件、淹沒(méi)出流流態(tài)特點(diǎn)和淹沒(méi)系數(shù)合理的確定方法,對(duì)工程實(shí)際應(yīng)用和學(xué)術(shù)理論研究都有很大的作用和價(jià)值。但目前還沒(méi)有完善的能確定由跌坎產(chǎn)生的淹沒(méi)修正系數(shù)的系統(tǒng)取值。本論文首先列舉出目前的對(duì)閘后存在跌坎情況下的閘孔淹沒(méi)出流問(wèn)題的處理方法,認(rèn)為目前存在的淹沒(méi)出流的判別方法和淹沒(méi)系數(shù)的計(jì)算方式,將水平底板上的閘孔淹沒(méi)出流的判別和淹沒(méi)系數(shù)的確定方式直接應(yīng)用到閘后存在跌坎情況是不正確的。提出了引入淹沒(méi)修正系數(shù)β=h'/hc"的方式,給出了針對(duì)平底坎閘孔出流淹沒(méi)判別的精確方法和修正后的淹沒(méi)系數(shù)確定方法。然后采用數(shù)值模擬的方法進(jìn)行計(jì)算,運(yùn)用標(biāo)準(zhǔn)k-ε湍流數(shù)學(xué)模型,用VOF法追蹤液體自由表面,并采用氣液兩相流的計(jì)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(duì)閘后存在跌坎情況下的淹沒(méi)出流進(jìn)行數(shù)值計(jì)算,得出的流場(chǎng)流態(tài)、流速分布隨跌坎相對(duì)高度d/e、相對(duì)長(zhǎng)度l/e的變化規(guī)律與理論分析規(guī)律基本一致。即通過(guò)對(duì)實(shí)際工程可能出現(xiàn)的各種尺寸的閘底坎的閘孔淹沒(méi)出流進(jìn)行了有序的系統(tǒng)的模擬計(jì)算研究,給出了有底坎的閘孔淹沒(méi)出流淹沒(méi)修正系數(shù)的β值與d/e、l/e的對(duì)應(yīng)關(guān)系,為實(shí)際工程應(yīng)用提供了依據(jù)。最后將數(shù)值模擬計(jì)算結(jié)果分別與經(jīng)典的實(shí)驗(yàn)數(shù)據(jù)和本校實(shí)驗(yàn)室的實(shí)驗(yàn)數(shù)據(jù)進(jìn)行了對(duì)比,數(shù)值模擬計(jì)算結(jié)果與這兩組實(shí)驗(yàn)數(shù)據(jù)吻合度都較高。充分說(shuō)明數(shù)值模擬方法可以應(yīng)用于計(jì)算實(shí)際工程中明渠閘后存在跌坎情況下的湍流流場(chǎng)流態(tài)和流速分布等。本論文的研究結(jié)果可以直接應(yīng)用于閘后存在跌坎情況下的淹沒(méi)出流水力計(jì)算,為工程實(shí)際應(yīng)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(méi)出流判別方式做出了重要貢獻(xiàn)。
[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(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TV135

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