Numerical modeling of spillway aerators in high-head dams
| Autor: | Ercan Işik, A. Emre Ulu, M. Cihan Aydin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Spillway
Cavitation lcsh:TD201-500 010504 meteorology & atmospheric sciences Dam Scale effect business.industry 0208 environmental biotechnology Flow (psychology) 02 engineering and technology Mechanics Computational fluid dynamics 01 natural sciences 020801 environmental engineering Volumetric flow rate Flow conditions lcsh:Water supply for domestic and industrial purposes Environmental science Air entrainment Aeration business 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Applied Water Science, Vol 10, Iss 1, Pp 1-9 (2020) |
| ISSN: | 2190-5495 2190-5487 |
| Popis: | Due to high flow velocity, the spillway surfaces of high-head dams can expose to cavitational damage. The most effective and economical method of protection from this damage is aerated to flow using aerators. In this study, a spillway aerator of the roller-compacted concrete dam of 100 m height was analyzed using two-phase computational fluid dynamic model to overcome the cavitation damage on the spillway surface. The numerical analysis with prototype dimensions was performed for various flow conditions (5223, 3500, 1750 and 1000 m3/s of flow rate), and obtained results were compared with some experimental observation in the literature. Numerical and experimental results indicated that the cavitation occurs on the surface after a certain downstream point based on cavitation indices. The air entrainment rate and air concentrations supplied by means of the aerator were determined to avoid the cavitational damage. While the experimental results can contain considerable scale effect in terms of air entrainment rate owing to, e.g., viscous effects especially for small scales, the numerical models with prototype dimensions gave much more accurate results. In other words, it can be also mentioned that the actual aeration amount is much greater than that obtained from the model experiments. The results based on numerical analysis showed that the aerator device meet air demand to prevent the cavitation damage. |
| Databáze: | OpenAIRE |
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