布隆岩水电站溢洪洞体型优化与出口消力池消能研究

发布时间：2018-03-19 20:52

本文选题：体型优化　切入点：消能　出处：《西安理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：泄水建筑物的体型研究和消能设施的合理选择是关系到水利枢纽工程安全与经济的重要问题。本文的研究结合布隆岩水电站泄水建筑物水力设计,采用物理模型试验和数值模拟计算相结合的研究方法来探讨分析溢洪洞体型优化与消力池消能机理。通过对原方案物理模型试验结果进行研究分析,尝试采用物理模型试验的方法对溢洪洞进口段体型和掺气设施体型进行研究优化,采用数值模拟计算的方法对消力池体型进行研究优化设计。在泄水建筑物整体体型进行修改优化后,对其不同来流量条件下的水力特性进行了整体物理模型试验研究,表明体型优化后的泄水建筑物达到了预期效果。主要结论有:(1)根据原方案物理模型试验结果,采用物理模型试验的方法对溢洪洞进口段体型和掺气减蚀设施体型进行研究优化,改善了溢洪洞泄流能力及水流流态,避免了溢洪洞发生空化空蚀破坏。(2)将相同工况条件下的数值模拟计算结果与物理模型试验结果进行对比分析,发现数值模拟计算的流态、水面线、流速、压强等水力特性沿程分布规律与物理模型试验结果吻合良好,可将其进一步应用于消力池体型的优化研究。(3)原方案消力池未形成完整水跃,消力池没有能够利用底流消能机理通过水跃消除不利动能。采用数值模拟计算的方法对消力池体型进行研究优化,选定消力池底板降低+侧掺气挑坎方案作为消力池体型优化推荐方案,并对推荐方案消力池体型与原方案消力池体型进行相同工况条件下的数值模拟计算研究,对比其水力特性的变化规律验证推荐方案的优越性。(4)对推荐方案消力池体型进行不同来流量条件下的数值模拟计算研究,对比分析消力池内其流态、流速、压强、紊动能及耗散率等水力特性的变化分布规律表明推荐方案消力池体型在不同来流量条件下均能取得理想消能效果具有较好适用性。(5)对体型优化后的整体泄水建筑物进行不同工况条件下的物理模型试验研究。将不同来流条件下溢洪洞段、消力池段及下游出口河道段的流态、水面线、压强、掺气要素等进行对比分析,表明体型优化后的泄水建筑物取得了理想成果。
[Abstract]:The research on the shape of the drainage structure and the reasonable selection of the energy dissipation facilities are important problems related to the safety and economy of the water conservancy project. The research in this paper is combined with the hydraulic design of the drainage structure of the Bulongyan Hydropower Station. The physical model test and numerical simulation are used to study the optimization of the shape of spillway tunnel and the energy dissipation mechanism of the dissipating pool. The results of the physical model test of the original scheme are studied and analyzed. The physical model test method is used to study and optimize the shape of inlet section and aeration facility of overflow tunnel. The optimum design of the stilling pool was studied by numerical simulation. After the overall shape of the drain structure was modified and optimized, the hydraulic characteristics under different discharge conditions were studied by the physical model test. The results show that the optimized drainage structure has achieved the expected effect. The main conclusions are as follows: (1) according to the physical model test results of the original scheme, the physical model test method is used to study and optimize the shape of the inlet section of the overflow tunnel and the aerated corrosion abatement facility. The discharge capacity and water flow state of the spillway are improved, and cavitation erosion damage occurs in the overflow tunnel is avoided. (2) the numerical simulation results under the same working conditions are compared with the physical model test results, and the flow pattern of the numerical simulation calculation is found. The distribution law of hydraulic characteristics such as water surface line, velocity and pressure agrees well with the results of physical model test. It can be further applied to the optimization study of the shape of stilling pool. (3) the original scheme of stilling pool has not formed a complete hydraulic jump. The stilling pool has not been able to eliminate the unfavorable kinetic energy by hydraulic jump by using the energy dissipation mechanism of the bottom flow. The shape of the stilling pool is studied and optimized by the numerical simulation method. In this paper, the scheme of reducing side aeration ridges on the bottom plate of stilling pool is selected as the optimal recommended scheme for the shape of stilling pool, and the numerical simulation calculation of the configuration of the stilling pool under the same working conditions is carried out. Comparing with the variation law of hydraulic characteristics, the superiority of the recommended scheme is verified. (4) the numerical simulation calculation of the recommended scheme stilling pool under different flow conditions is carried out, and the flow pattern, velocity and pressure in the stilling pool are compared and analyzed. The variation and distribution of hydraulic characteristics such as turbulent energy and dissipation rate show that the recommended scheme can achieve ideal energy dissipation effect under different discharge conditions. The physical model tests were carried out under different working conditions. The flow pattern, water surface line, pressure and aeration elements of the stilling pool section and the downstream outlet channel are compared and analyzed. The results show that the optimized drainage structure has achieved ideal results.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV135.2;TV65

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