Investigation of a fast transition from pump mode to generating mode in a model scale reversible pump turbine
Investigation of a fast transition from pump mode to generating mode in a model scale reversible pump turbine
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DOI：
10.1088/1755-1315/49/11/112001
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
C. Stens;S. Riedelbauch
中科院分区：
文献类型：
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作者：
C. Stens;S. Riedelbauch
抽水蓄能电站是大规模储存能量的有效方式。近年来，泵和涡轮机模式之间的变化变得越来越频繁，快速变化的必要性也增加了。本文采用CFD方法分析了模型水泵涡轮机从抽水工况快速过渡到发电工况时的内部流动。结果将在两种不同的网格尺寸之间以及在模拟和测量之间进行比较。选择旋转速度随时间的线性变化。在入口处规定了通过机器的时间相关流速。由于条件的变化，使用开源代码OpenFOAM®进行了完全的瞬态分析。将瞬态过程中某些时间点的机器状态与具有相同边界条件的稳态模拟结果进行比较。为了表征导叶通道中的现象，评估选定导叶上的扭矩以及预定义位置处的压力。在转轮中，压力传感器在压力侧和吸力侧的前缘附近进行评估。在尾水管中，四个动态压力传感器在转轮下方的平面进行了分析。将频率和振幅与仿真进行比较。
Pumped storage power plants are an efficient way to store energy at a large scale. In the last years, the changes between pump and turbine mode have become more and more frequent and the necessity of fast changes has increased. This paper analyses the flow in a model scale pump turbine during a fast transition from pump mode to generating mode by means of CFD. Results will be compared between two different mesh sizes and between simulation and measurement. A linear variation of rotational speed over time is chosen. A time-dependent flow rate through the machine is prescribed at the inlet. Due to the varying conditions, a fully transient analysis is carried out using the open-source code OpenFOAM®. The state of the machine at certain points of time during the transient is compared to the results for steady state simulations with identical boundary conditions. To characterize the phenomena in the guide vane channels, torque on selected guide vanes is evaluated as well as pressure at predefined locations. In the runner, pressure sensors are evaluated near the leading edge on pressure and suction side. In the draft tube, four dynamic pressure sensors in a plane below the runner are analysed. Frequencies and amplitudes are compared to simulation.