小湾水电站泄洪洞洞身数值模拟

发布时间：2018-04-26 13:14

本文选题：泄洪洞 + 数值模拟　；参考：《排灌机械工程学报》2017年06期

【摘要】：小湾水电站泄洪洞水头高、泄量大、水力条件复杂,模型试验有缩尺效应等局限性.利用Flow 3D独特的FAVOR网格技术,采用RNG k-ε紊流模型,对小湾水电站泄洪洞9种不同工况展开三维数值模拟研究,获得了泄流能力、流态、水面线、流速、动水压力等水力学要素,并将部分数据与模型试验、原型观测结果对比.研究结果表明,小湾泄洪洞数值模拟计算的泄流能力稍大于模型试验值;有压段均无气囊等不利流态,无压段水流流态平顺,无水流或水翅冲击洞顶,掺气坎后均能形成稳定空腔,且计算结果与模型试验及原型观测基本吻合;沿程水面线与流速分布符合急流变化特征,并与模型试验结果一致;泄洪洞进口、转弯段、渥奇曲线及反弧段压力分布规律与模型试验结果基本一致;数值模拟的各项水力学指标均具有一定精确度,且比模型试验、原型观测所得结果更为系统化,克服了模型试验中个别区域不便测量的缺点.
[Abstract]:The flood discharge tunnel of Xiaowan Hydropower Station has many limitations, such as high head, large discharge, complicated hydraulic conditions and scaling effect in model test. Using the unique FAVOR grid technology of Flow 3D and RNG k- 蔚 turbulence model, the 3D numerical simulation of 9 different working conditions of flood discharge tunnel of Xiaowan Hydropower Station is carried out. The hydraulic elements such as discharge capacity, flow pattern, water surface line, velocity of flow, dynamic pressure and so on are obtained. And some data are compared with model test and prototype observation results. The results show that the discharge capacity calculated by numerical simulation of Xiaowan flood discharge tunnel is slightly larger than the model test value, and there is no adverse flow state such as airbag in the pressure section, and the water flow pattern is smooth in the no pressure section, and no water flow or water wing impinges on the roof of the tunnel. After aeration, stable cavities can be formed, and the calculated results are in good agreement with the model test and prototype observation, the distribution of water surface line and velocity along the course accords with the characteristics of jet flow, and is consistent with the results of model test. The pressure distribution of the Warch curve and the reverse arc section is basically consistent with the results of the model test, and the hydraulic indexes of the numerical simulation have some accuracy and are more systematic than those obtained from the model test, and the results obtained from the prototype observation are more systematic than those obtained from the model test. It overcomes the disadvantage of inconvenient measurement of individual area in model test.
【作者单位】：中国电建集团昆明勘测设计研究院有限公司;云南农业大学水利学院;
【分类号】：TV651.3

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