本文選題：前池入水口 + 三維湍流　； 參考：《揚州大學(xué)》2014年碩士論文

【摘要】：泵站入水口是水體流進泵站的第一道關(guān)口,具有穩(wěn)定水流、保證泵站進水穩(wěn)定性等作用,尤其對穩(wěn)定泵站進水池水流和提高泵站運營效率有著非常重要的意義。在泵站進水選擇形式上,正向進水無疑是最好的選擇方式。但泵站多數(shù)建于河道岸邊,這就意味著河道水體要經(jīng)過側(cè)向入水口而進入泵站。所以側(cè)向入水方式在中小型泵站的建造中運用很普遍。本文以大型計算流體力學(xué)軟件CFX為平臺,運用三維紊流數(shù)值計算技術(shù),對泵站前池入水口進行全面系統(tǒng)的研究分析,揭示進水前池入水口對入水口附近河道水體及進水池內(nèi)水力特農(nóng)特崗的影響,并做優(yōu)化模型研究。 采用RNGk-ε湍流模型對中小型泵站前池入水口進行三維湍流數(shù)值模擬研究,預(yù)演入水口的基本模型及基本流態(tài)。定性分析前池入水口對入水口附近河道水體及進水池內(nèi)水力特性的影響。對比分析不同入水口深寬比及入水口角度等因素對水力特性的影響,重點分析水體流經(jīng)入水口后在進水池內(nèi)達到水流平穩(wěn)的長度與入水口形式的關(guān)系。 通過前池入水口不同深寬比和不同角度的研究,并且與基本流態(tài)特征進行對比,闡述深寬比和角度對入水口附近河道水體和泵站進水前池內(nèi)水體流動的影響。結(jié)合模擬結(jié)果中的底層、中層、表層流線圖和流速分布圖,分析深寬比和角度對入水口水力特性影響的規(guī)律及影響進水池水體紊動的長度,總結(jié)出前池入水口模型中較為合適的深寬比和最佳角度。結(jié)合工程實際,對建于河道較窄及盲腸河道處的入水口進行數(shù)值模擬研究,得出其影響泵站進水前池水流波動長度的范圍。 通過數(shù)值計算分析前池入水口對河道影響的結(jié)果,針對河道水體回流流進入水口的情況,進行改善入水口形式的水力優(yōu)化。本文建立八字口形式和喇叭口形式的入水口模型,并模擬、分析其水力特性。結(jié)果表明喇叭口形式的入水口形式更有利于水流的穩(wěn)定。
[Abstract]:The inlet of pump station is the first gate of water flow into pump station. It has the function of stabilizing the flow of water and ensuring the stability of the inlet water of the pump station. Especially, it is of great significance to stabilize the water flow into the pool of the pump station and to improve the operation efficiency of the pump station. In pumping station water selection form, forward water is undoubtedly the best choice. But most of the pumping stations are built on the banks of the river, which means that the river water enters the pumping station through the lateral inlet. So the lateral approach is widely used in the construction of small and medium pumping stations. Based on the large-scale computational fluid dynamics software CFX and using the three-dimensional turbulent numerical calculation technology, this paper makes a comprehensive and systematic study and analysis on the inlet of the front pool of the pump station. The influence of the inlet of the forebay on the water body of the river near the inlet and the hydraulic special post in the inlet pool was revealed and the optimization model was studied. RNGk- 蔚 turbulence model is used to simulate the three dimensional turbulent flow at the inlet of the small and medium-sized pumping station. The basic model and the basic flow state of the inlet are previewed. The influence of the inlet of the front pool on the hydraulic characteristics of the channel water and the inlet pool near the inlet is analyzed qualitatively. The effects of different ratio of depth to width of inlet and angle of inlet on hydraulic characteristics were analyzed, and the relationship between the steady length of water flow in the inlet pool and the form of inlet was analyzed. Based on the study of different aspect ratios and angles of the inlet of the forebay and the comparison with the basic flow characteristics, the effects of the ratio of depth to width and the angle on the flow in the water body of the river near the inlet and the inlet of the pump station are discussed. Combined with the bottom, middle and surface streamlines of the simulation results and the velocity distribution map, the influence of depth to width ratio and angle on the characteristics of the inlet water force and the length of the turbulence in the inlet water body are analyzed. The proper ratio of depth to width and the optimum angle in the model of the inlet of the front pool are summarized. Based on the engineering practice, a numerical simulation of the inlet in the narrow channel and the caecum channel is carried out, and the range of its influence on the water flow fluctuation length in the inlet forebay of the pumping station is obtained. According to the results of numerical calculation and analysis of the influence of the inlet of the forebay on the channel, the hydraulic optimization of the form of the inlet is carried out in view of the situation of the reflux flow into the inlet of the river. In this paper, the water inlet models of eight mouth and bell mouth are established and simulated, and their hydraulic characteristics are analyzed. The results show that the orifice is more favorable to the stability of water flow.
【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV135

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