本文選題：勢(shì)流分析　切入點(diǎn)：物理模型實(shí)驗(yàn)　出處：《浙江大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：水電站取水口誘導(dǎo)流場(chǎng)對(duì)庫(kù)區(qū)魚(yú)類(lèi)卷吸風(fēng)險(xiǎn)評(píng)估具有重要意義,流場(chǎng)與溫度分布直接影響水庫(kù)下泄水溫。白鶴灘水電站位于金沙江下游,左右岸均設(shè)有9個(gè)取水口,左岸設(shè)有3個(gè)泄洪洞。本文以該水電站為研究對(duì)象,通過(guò)研究不同工況下取水口上游流場(chǎng)分布,總結(jié)了水動(dòng)力學(xué)特征、計(jì)算出魚(yú)類(lèi)卷吸風(fēng)險(xiǎn)區(qū)域的范圍,并在給定的溫度分層條件下模擬計(jì)算取水口下泄水溫。本文首先討論了左岸取水口上游水動(dòng)力學(xué)要素特征,并評(píng)估了各模擬工況下的魚(yú)類(lèi)卷吸風(fēng)險(xiǎn),然后模擬了典型溫度分層工況下各取水口下泄水溫及上游流速分布。 本文首先通過(guò)理論分析及物理模型實(shí)驗(yàn)方法研究了不同取水口、泄洪洞開(kāi)啟工況下取水口上游流場(chǎng)水力特征,然后利用ANSYS CFX軟件建立了三維(3D)計(jì)算水動(dòng)力學(xué)(CFD)數(shù)值模型,并利用南京水利科學(xué)研究院1：50的物理模型進(jìn)行驗(yàn)證。該3D CFD模型通過(guò)求解雷諾平均納維-斯托克斯(RANS)方程,結(jié)合雙方程k-ε模型,研究了多個(gè)典型運(yùn)行工況。理論分析與CFD模擬結(jié)果表明白鶴灘水電站取水口上游流場(chǎng)特征在不同運(yùn)行工況下有顯著變化,多取水口與線(xiàn)匯誘導(dǎo)流場(chǎng)在取水口間隔距離2倍之外的上游,速度分布基本一致。本文在利用CFD模型計(jì)算流場(chǎng)特征的基礎(chǔ)上評(píng)估魚(yú)類(lèi)卷吸風(fēng)險(xiǎn),結(jié)果表明魚(yú)類(lèi)卷吸風(fēng)險(xiǎn)區(qū)域范圍與水庫(kù)水位、取水口流量及運(yùn)行模式有關(guān),在低水位工況下更大。 溫度是下泄水體關(guān)鍵指標(biāo)之一,控制下泄水溫對(duì)下游河道的生態(tài)環(huán)境非常重要。本文根據(jù)白鶴灘水庫(kù)水溫的季節(jié)性分布,利用3D CFD模擬了白鶴灘水電站取水口及泄洪洞工作工況的下泄水溫,并對(duì)比分析了多種工況下下泄水溫及流場(chǎng)特性,結(jié)果表明取水口下泄水溫在夏季低水位工況下最高；右岸取水口下泄水溫較低；泄洪工況下取水口下泄水溫相比于發(fā)電工況在不同溫度分層時(shí)有0.1～1.3℃的升高幅度。
[Abstract]:The induced flow field at the intake point of the hydropower station is of great significance to the risk assessment of fish entrainment in the reservoir area, and the flow field and temperature distribution directly affect the drainage temperature of the reservoir. The Baihetan Hydropower Station is located in the lower reaches of the Jinsha River, and there are 9 water intake outlets on the left and right banks. There are three flood discharge tunnels on the left bank. This paper takes the hydropower station as the research object, sums up the hydrodynamic characteristics and calculates the range of fish entrainment risk area by studying the upstream flow field distribution of the intake outlet under different working conditions. In this paper, the characteristics of hydrodynamic elements in the upper reaches of the left bank are discussed, and the risk of fish entrainment under various simulated conditions is evaluated. Then, the temperature distribution and the upstream velocity distribution are simulated under the typical temperature stratification condition. In this paper, the hydraulic characteristics of the upstream flow field at different intake points and discharge tunnels are studied by means of theoretical analysis and physical model experiments, and then a 3D hydrodynamic CFDs numerical model is established by using ANSYS CFX software. The model is verified by the 1:50 physical model of Nanjing Institute of Water Conservancy Sciences. The 3D CFD model is solved by solving the Reynolds mean Navier-Stokes Stokes (RANS) equation, combined with the two-side K- 蔚 model. Several typical operating conditions are studied. Theoretical analysis and CFD simulation results show that the characteristics of the upstream flow field at the intake point of Baihetan Hydropower Station vary significantly under different operating conditions. The velocity distribution of multi-inlet and line-sink induced flow field is basically the same as that of the upstream flow field which is more than 2 times the distance between the intake points. In this paper, the fish entrainment risk is evaluated on the basis of calculating the characteristics of the flow field by using the CFD model. The results show that the risk range of fish entrainment is related to reservoir water level, intake discharge and operation mode, and is larger under low water level condition. The temperature is one of the key indexes of the drainage water body, and it is very important for the ecological environment of the downstream river channel to control the temperature of the drainage water. According to the seasonal distribution of the water temperature of Baihetan Reservoir, Using 3D CFD to simulate the discharge temperature of water intake and discharge tunnel of Baihetan Hydropower Station, and to compare and analyze the characteristics of discharge temperature and flow field under various working conditions. The results show that the outlet discharge temperature is the highest under low water level in summer. The discharge temperature of the right bank intake outlet is lower than that of the power generation condition, and the temperature of the outlet drain under the flood discharge condition has a rise range of 0.1 ~ 1.3 鈩，

本文編號(hào)：1595691