本文選題：雙擺渡閘站 + 水力特性�。� 參考：《揚(yáng)州大學(xué)》2017年碩士論文

【摘要】：雙擺渡閘站工程位于安徽省馬鞍山市扁擔(dān)河入長江口處,兼具抽排和自排功能,采用立面分層、平面不對(duì)稱閘站結(jié)合布置型式,前池水流流態(tài)復(fù)雜,易引起泵裝置效率降低、自排過流能力下降和形成泥沙淤積。本文采用數(shù)值模擬和模型試驗(yàn)相結(jié)合的方法對(duì)雙擺渡閘站工程水力特性進(jìn)行綜合分析研究,并提出優(yōu)化方案。本文主要研究內(nèi)容如下:(1)借助計(jì)算流體力學(xué)(CFD)軟件,采用N-S方程和標(biāo)準(zhǔn)k-ε湍流模型對(duì)原設(shè)計(jì)方案進(jìn)行數(shù)值模擬。數(shù)值計(jì)算結(jié)果表明,該工程多工況條件下前池存在斜流和泥沙淤積的問題,進(jìn)水流道存在流速分布不均勻的問題。因此,原設(shè)計(jì)方案存在不足,需要對(duì)其進(jìn)行改進(jìn)優(yōu)化。(2)針對(duì)原設(shè)計(jì)方案存在的不足,采用導(dǎo)流墩對(duì)其進(jìn)行改進(jìn)優(yōu)化。對(duì)加設(shè)20m、25m、30m和35m等4種長度的導(dǎo)流墩方案進(jìn)行數(shù)值模擬研究,以壓迫主流的渦面積大小為控制條件對(duì)導(dǎo)流墩長度進(jìn)行優(yōu)化分析,得出了前池導(dǎo)流墩的合理長度范圍。結(jié)果表明,合理長度導(dǎo)流墩能夠改善前池水流流態(tài)和進(jìn)水流道流速分布,增強(qiáng)水流攜沙能力,滿足整流需求。(3)根據(jù)水工模型試驗(yàn)規(guī)程,按照重力相似準(zhǔn)則選定1:25作為模型試驗(yàn)比尺,按照糙率相似準(zhǔn)則選用透明有機(jī)玻璃板及PVC灰板作為模型材料,采用正態(tài)模型對(duì)原設(shè)計(jì)方案典型工況下前池水流流態(tài)進(jìn)行試驗(yàn)研究,繪制了流態(tài)圖和流速分布圖。結(jié)果表明,該工程多工況條件下前池存在斜流和泥沙淤積的問題,與數(shù)值模擬結(jié)果一致。(4)選取20m和28m長導(dǎo)流墩作為典型代表進(jìn)行分析,采用模型試驗(yàn)方法對(duì)數(shù)值模擬得出的導(dǎo)流墩合理長度范圍進(jìn)行驗(yàn)證。結(jié)果表明,與原設(shè)計(jì)方案相比,采用合理長度導(dǎo)流墩后,前池水流流態(tài)明顯改善,水流攜沙能力明顯增強(qiáng);數(shù)值模擬得出的導(dǎo)流墩合理長度范圍在25m～30m之間是可靠的。(5)采用模型試驗(yàn)方法對(duì)該工程下游消能防沖能力進(jìn)行了研究,繪制了下游水面線示意圖。根據(jù)水流波動(dòng)情況,得出了下游消能防沖設(shè)施布置基本合理的結(jié)論。本文開展的雙擺渡閘站工程水力特性數(shù)值模擬和模型試驗(yàn)的最終結(jié)果是一致的。數(shù)值模擬結(jié)果有效地指導(dǎo)了模型試驗(yàn)研究,節(jié)約了模型試驗(yàn)的投資,提高了研究效率。同時(shí),模型試驗(yàn)驗(yàn)證了數(shù)值模擬的準(zhǔn)確性。本文的研究方法和成果能夠?yàn)殡p擺渡閘站工程的設(shè)計(jì)和運(yùn)行管理提供改進(jìn)措施和建議,對(duì)保證該工程安全、高效和穩(wěn)定運(yùn)行有著重要意義。而且,也能夠?yàn)橥愰l站工程的設(shè)計(jì)、運(yùn)行管理和研究提供一定的參考價(jià)值。
[Abstract]:The Shuanghuodu sluice station project is located at the entrance of the Anshan City, Anhui Province, into the Yangtze River Estuary. It has the functions of drainage and self-drainage. It adopts the facade stratification, the plane asymmetrical sluice station is arranged in combination, and the water flow state in the front pool is complicated, which can easily cause the efficiency of the pump device to be reduced. The capacity of self-discharge flow is decreased and sediment deposition is formed. In this paper, the method of numerical simulation and model test is used to analyze and study the hydraulic characteristics of Shuangyue sluice station, and the optimization scheme is put forward. The main contents of this paper are as follows: (1) with the help of computational fluid dynamics (CFD) software, N-S equation and standard k- 蔚 turbulence model are used to simulate the original design scheme. The numerical results show that there are problems of oblique flow and siltation in the forebay and uneven velocity distribution in the inlet channel under the condition of multiple working conditions. Therefore, there are shortcomings in the original design scheme, which need to be improved and optimized. (2) aiming at the shortcomings of the original design scheme, the diversion pier is adopted to improve and optimize the original design scheme. A numerical simulation study was carried out on four kinds of diversion piers with 20m ~ 25m ~ 25m and 35m respectively. The optimum analysis of the length of the diversion piers was carried out under the control condition of the vortex area of the compression mainstream, and the reasonable length range of the forepool diversion piers was obtained. The results show that the reasonable length of the piers can improve the flow pattern of the front pool and the velocity distribution of the inlet passage, enhance the sediment carrying capacity of the flow, and meet the demand of rectifying. (3) according to the hydraulic model test rules, According to gravity similarity criterion, 1:25 was selected as model scale, and transparent plexiglass board and PVC ash board were selected as model materials according to roughness similarity criterion. The normal model was used to study the flow pattern of the front pool under typical working conditions, and the flow pattern and velocity distribution diagram were drawn. The results show that there are problems of inclined flow and sediment deposition in the forebay under multi-working conditions, which are consistent with the numerical simulation results. (4) the 20m and 28m long diversion piers are selected as typical representatives. The model test method is used to verify the reasonable length range of the diversion pier obtained by numerical simulation. The results show that, compared with the original design, the flow state of the front pool is obviously improved and the sediment carrying capacity of the water is obviously enhanced after the reasonable length of the diversion pier is adopted. The reasonable length range of the diversion pier obtained by numerical simulation is reliable between 25m~30m. (5) the downstream energy dissipation and anti-scour ability of the project is studied by using model test method, and the downstream surface line diagram is drawn. According to the fluctuation of water flow, the conclusion is drawn that the arrangement of energy dissipation and scour prevention facilities is basically reasonable. The numerical simulation of hydraulic characteristics of Shuangyue sluice station in this paper is consistent with the final results of the model test. The results of numerical simulation can effectively guide the research of model test, save the investment of model test, and improve the efficiency of research. At the same time, the model test verifies the accuracy of the numerical simulation. The research methods and results of this paper can provide improvement measures and suggestions for the design and operation management of Shuangyue Gate Station, which is of great significance to ensure the safety, efficiency and stability of the project. Moreover, it can provide some reference value for the design, operation management and research of the similar sluice station.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV131.6

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1 許偉健;雙擺渡閘站工程水力特性數(shù)值模擬與模型試驗(yàn)研究[D];揚(yáng)州大學(xué);2017年

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本文編號(hào)：2086620