【作者】 刘晶；

【导师】 高学平；

【作者基本信息】 天津大学 ， 水利工程， 2012， 硕士

【摘要】 本文以南康河水电站为例,采用三维k ??紊流数学模型对泄水建筑物设计方案进行三维数值模拟研究。主要研究对象为溢洪道、电站进水口和冲沙洞,重点分析了流态、流速、压强及水头损失等水力特性。本文采取数值模拟与理论分析相结合的手段,对原设计方案进行模拟计算。根据计算结果,优化泄水建筑物体型,并进行进一步数值模拟研究,将数值模拟的计算结果与物理模型试验结果进行对比,以验证优化方案满足设计要求。数值计算结果表明,原设计方案溢洪道泄流能力不能满足设计要求;在1000年一遇洪水工况下,溢洪道表面出现较小负压,但远小于规范中规定的数值;电站单独运行及同溢洪道联合运行时,进口处流态较好,流速分布均匀。鉴于泄流能力不能满足设计要求,建议进行堰顶优化。堰顶优化方案,将堰顶高程由650.5m降至649.5m,主要对堰顶曲线段和掺气坎上游直线段进行了修改。结果表明,溢洪道泄流能力满足设计要求;在1000年一遇洪水工况下,溢洪道表面仍出现较小负压;电站进口处流态较好,流速分布均匀。更多还原

【Abstract】 By applying k turbulence model and VOF method, 3-D numerical simulation study was made on the hydraulic characteristics of discharge structure of Nankang River Hydropower Station. This paper focuses on analysis of the flow pattern, flow rate, pressure, head loss and other hydraulic characteristics. According to the calculation results, optimize the shape of discharge structure and study numerical simulation further is necessary. Then the numerical simulation results and physical model test results are compared.Numerical results show that the discharge capacity of original scheme can’t meet design requirement. When the flood recurrence interval is 1000 years, spillway surface appears negative pressure, but it is in reasonable range. No matter whether the hydropower station operates, flow regime of power station intake is good and velocity distribution is uniform. Conclusion is that the shape of overflow weir should be optimized because of the insufficient discharge capacity.In the optimization scheme, the elevation of overflow weir is dropped to 649.5m. The new model have several important modifications at curve segment and upstream of aeration slot. The calculation results show that the discharge capacity of optimization scheme can meet design requirement. When the flood recurrence interval is 1000 years, spillway surface also appears negative pressure, but it is safe enough in operation. Flow regime of power station intake is good and velocity distribution is uniform.更多还原