泄洪洞旋流阻塞消能的数值模拟  

Numerical simulation of energy dissipation of vortex flow in flood discharging tunnel with barrage

作　　者：鲁学蕾 范济神[1] 赵振兴[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《水利水运工程学报》2014年第1期78-84,共7页Hydro-Science and Engineering

摘　　要：运用标准κ-ε模型、RNGκ-ε模型、Realizableκ-ε模型、标准κ-ω模型,并结合VOF法对公伯峡水电站右岸泄洪洞的水流进行数值模拟,利用原型观测资料对计算结果进行对比验证,结果表明RNGκ-ε模型的模拟结果与原型观测资料最为接近。在此基础上,把原泄洪洞的旋流洞及其后段简化为直洞并在直洞不同位置布置阻塞,然后应用RNGκ-ε模型对其内部水流进行数值模拟,通过比较消能率、沿程压力及流场空化数分布,得出阻塞最佳布置位置,并给出最佳位置下水流的湍流特性。A standard κ-ε model, a RNG κ-ε model, a Realizableκ-ε model and a standard κ-εmodel combined with VOF method which can get the free surface of water are applied to simulate the vortex flow in the flood discharging tunnel of Gongboxia Hydropower Station respectively. The validity of the calculation is verified by the prototype data, and the RNG κ-ε model is more applicable than others. Then the vortex-type tunnel and its posterior segment are simplified to a straight tunnel and the barrage is placed in different locations. The RNG K-~ model is applied to simulate the internal flow. By comparing and analyzing the rate of energy dissipation, pressure distritmtion and cavitation number, the optimum location for placing the barrage and the corresponding turbulent characteristics are obtained by numerical simulation. It can be found from the change tendency of the turbulence kinetic energy and the dissipation rate that there is a same change rule between the both sides mentioned above, and this fully shows that the greater the turbulency kinetic energy is, the higher the dissipation rate is.

关 键 词：旋流阻塞消能 RNG κ-ε模型 消能率 空化数 

分 类 号：TV135.2[水利工程—水力学及河流动力学]