| 摘要: |
| 采用可行化k-ε湍流模型、VOF法界面跟踪技术及分区结构非结构网格区域离散方法,对甘肃九甸峡水电站双洞式溢洪道引水渠和溢流段的三维自由面流动进行了数值模拟,并以改善进口不良流态、消除堰顶较大负压,平衡两洞间的流量分配作为目标,对其体型进行了优化研究。结果表明,原设计方案过堰流动水面严重扭曲,且存在明显的负压,体型设计不合理;优化方案获得了理想的进水口与溢流堰曲线形式。所有计算结果与实测值吻合良好,说明数值模拟技术可以在岸边溢洪道的水力设计和体型优化中发挥重要作用。 |
| 关键词: 明流溢洪道 数值模拟 VOF方法 体型优化 |
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| 基金项目:国家自然科学基金资助项目（50579085） |
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| Application of numerical modeling in the optimization design of the bi-tunnel spillway |
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| Abstract: |
| The realizable k-ε turbulent model is applied to simulating the turbulent overflow in the bi tunnel spillway of Jiudianxia Hydropower Station.The complex flow region is divided into several sub-regions and meshed with structure and non-structure grids,respectively.The free surface is traced with volume of fluid method (VOF).The computed results for the original design geometry show that the free surface over the crest of weir is distorted highly,and there exists unreasonable negative pressure over the crest of weir.Taking the improvement of inflow pattern,the elimination of negative pressure over the crest,and the balance of flow rate between two tunnels as objective functions of hydraulic design of inlet region,an optimal design scheme is obtained by numerical simulations and optimization. Consistency of computed results with the experimental data shows that the suggested model can be applied to the selection design of the inlet configuration of spillway tunnel |
| Key words: spillway channel,numerical simulation,VOF method,optimal design |
