Numerical simulation of hydraulic characteristics of piano-key weir
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Abstract:
The piano-key weir is a new form of labyrinth weir and is characterized by a significant increase in the discharge capacity under the same weir width and water head condition. We used the RNG k-εtype turbulence mathematical model and the VOF method to deal with the free water surface and to establish a three-dimensional mathematical model. Through the calculation of the shape of the piano-key weir in different conditions, we obtained the flow regime, flow velocity , and other information of the three-dimensional flow field. The results were as follows. (1) The software Fluent was applicable to the numerical simulation of the piano-key weir, and it proved the remarkable discharge effect of the piano-key weir. (2) The three-dimensional flow field of the piano-key weir had a complex flow regime and the properties of ternary flow. The change of weir head would affect the discharge capacity of the piano-key weir. (3) The flow at the upper and lower reaches showed the state of open channel flow with a minimum velocity of 0.2 m/s. When the flow passed the weir, it formed water jets with increased velocity. There was air entering from the ventilation holes at the cavities between the water jets and the weir wall, forming a whirlpool. The air flow velocity was 2 m/s. After the water jets entered the water, there was air mixed with the water. The numerical simulation technique generated more detailed flow field information, which laid the foundation for further study of the flow field characteristics of the piano-key weir.
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