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.
The tunnel of Xiaowan Hydropower Station with high head water and large discharge has complex hydraulic conditions. The model test has scale effect. By using RNG k - ε turbulence model, and unique FAVOR grid technology of Flow 3D, 3D numerical simulation was conducted for nine working conditions of the tunnel of Xiaowan Hydropower Station. The discharge capacity, flow pattern, dynamic pressure, water surface, velocity of flow were obtained and were compared to those of the model test and prototype observation. The results show that the discharge capacity simulated is a littler greater than that of the model test. There is no gasbag in the pressure section, and the flow regime is smooth in the non-pressure section, there is no water and water-wing to attack the cave roof, and stable cavity is formed behind the aerator. The simulation results are consistent with those of the model test and prototype observation. The velocity of flow and water depth of the model test and the simulation are almost the same and in accord with the characteristics of rapids. The distribution law of dynamic pressure at the inlet of tunnel, turning section, ogee surface and arc segment is the same with that of the model test, showing that the hydraulic parameters of the numerical simulation have a certain accuracy and are more systematic than those of the model test and prototype observation.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第6期488-494,共7页
Journal of Drainage and Irrigation Machinery Engineering
关键词
泄洪洞
数值模拟
模型试验
原型观测
tunnel
numerical simulation
model test
prototype observation
