双摆渡闸站工程水力特性数值模拟与模型试验研究

发布时间：2018-06-30 19:40

本文选题：双摆渡闸站 + 水力特性　；参考：《扬州大学》2017年硕士论文

【摘要】：双摆渡闸站工程位于安徽省马鞍山市扁担河入长江口处,兼具抽排和自排功能,采用立面分层、平面不对称闸站结合布置型式,前池水流流态复杂,易引起泵装置效率降低、自排过流能力下降和形成泥沙淤积。本文采用数值模拟和模型试验相结合的方法对双摆渡闸站工程水力特性进行综合分析研究,并提出优化方案。本文主要研究内容如下:(1)借助计算流体力学(CFD)软件,采用N-S方程和标准k-ε湍流模型对原设计方案进行数值模拟。数值计算结果表明,该工程多工况条件下前池存在斜流和泥沙淤积的问题,进水流道存在流速分布不均匀的问题。因此,原设计方案存在不足,需要对其进行改进优化。(2)针对原设计方案存在的不足,采用导流墩对其进行改进优化。对加设20m、25m、30m和35m等4种长度的导流墩方案进行数值模拟研究,以压迫主流的涡面积大小为控制条件对导流墩长度进行优化分析,得出了前池导流墩的合理长度范围。结果表明,合理长度导流墩能够改善前池水流流态和进水流道流速分布,增强水流携沙能力,满足整流需求。(3)根据水工模型试验规程,按照重力相似准则选定1:25作为模型试验比尺,按照糙率相似准则选用透明有机玻璃板及PVC灰板作为模型材料,采用正态模型对原设计方案典型工况下前池水流流态进行试验研究,绘制了流态图和流速分布图。结果表明,该工程多工况条件下前池存在斜流和泥沙淤积的问题,与数值模拟结果一致。(4)选取20m和28m长导流墩作为典型代表进行分析,采用模型试验方法对数值模拟得出的导流墩合理长度范围进行验证。结果表明,与原设计方案相比,采用合理长度导流墩后,前池水流流态明显改善,水流携沙能力明显增强;数值模拟得出的导流墩合理长度范围在25m～30m之间是可靠的。(5)采用模型试验方法对该工程下游消能防冲能力进行了研究,绘制了下游水面线示意图。根据水流波动情况,得出了下游消能防冲设施布置基本合理的结论。本文开展的双摆渡闸站工程水力特性数值模拟和模型试验的最终结果是一致的。数值模拟结果有效地指导了模型试验研究,节约了模型试验的投资,提高了研究效率。同时,模型试验验证了数值模拟的准确性。本文的研究方法和成果能够为双摆渡闸站工程的设计和运行管理提供改进措施和建议,对保证该工程安全、高效和稳定运行有着重要意义。而且,也能够为同类闸站工程的设计、运行管理和研究提供一定的参考价值。
[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.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV131.6

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