| 摘要: |
| 运用标准κ-ε模型、RNGκ-ε模型、Realizable κ-ε模型、标准κ-ε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RNG κ-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RNG κ-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。 |
| 关键词: 旋流阻塞消能 RNG κ-ε模型 消能率 空化数 |
| DOI： |
| 分类号:TV135.2 |
| 基金项目: |
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| Numerical simulation of energy dissipation of vortex flow in flood discharging tunnel with barrage |
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LU Xue-lei, FAN Ji-shen, ZHAO Zhen-xing
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College of Mechanics and Materials， Hohai University
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| Abstract: |
| A standard κ-ε model， a RNG κ-ε model， a Realizable κ-ε model and a standard κ-ε model 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 RNGκ-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 RNGκ-ε model is applied to simulate the internal flow. By comparing and analyzing the rate of energy dissipation， pressure distribution 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. |
| Key words: vortex flow dissipation with barrage RNG κ-ε model rate of energy dissipation cavitation number |
