| 巨江,刘 菁,诸 亮,刘少斌.水电站引水-尾水管道系统水力过渡过程模型试验与计算[J].水利学报,2005,36(10):1165-1170 |
| 水电站引水-尾水管道系统水力过渡过程模型试验与计算 |
| Model study and calculation of hydraulic transient in hydro power station pipeline |
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| DOI： |
| 中文关键词: 水力过渡过程 调压室 水锤压力 涌浪 模型试验 数学模型 |
| 英文关键词: hydraulic transient pipeline system surge tank water hammer model test mathematical model Laxiwa Hydroproject |
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| 摘要点击次数: 2885 |
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| 中文摘要: |
| 本文针对拉西瓦水电站引/尾水管道系统，修建了一个大比尺(1/50)且部分正态、部分变态的物理模型，并通过调频电机改变导叶启闭时间，观测了机组增甩负荷时压力管道内的水流流态、水头损失、调压室涌浪及涡壳进口处的水锤压力过程线。利用模型试验实测资料，率定出调压室阻抗孔局部阻力系数的计算公式，使数值计算得到的调压室涌浪、引/尾水管道水锤压力及其过程线与模型试验吻合良好。再用数值计算弥补物理模型不能回答尾水管进口最大真空度以及模拟非线性关闭的缺陷，提出了物理模型设计可放弃弹性相似准则的结论，使模型材料不受限制。计算在缺乏水轮机特性曲线的条件下，数值求解转动方程也可得到机组最大转速及其过程线。 |
| 英文摘要: |
| A large-scale physical model was built to study the hydraulic transient in pipeline system of the Laxiwa Hydro Project. The Project located on the upper reaches of the Yellow River with maximum dam height 250m. The flow regime, head losses, waves in surge tanks and the water hammer taken place at the intake of turbine were measured in model test. According to the model test data the resistance coefficients of the surge tank orifices were obtained. On this basis, the mathematical model was applied to further investigate the minimum negative pressure at the inlet of tail water tunnel and simulate the transient of nonlinear closing of power unit. It was also found that in some cases the elasticity similarity of model tunnel can be ignored. |
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