Numerical modeling of spillway aerators in high-head dams
Abstract 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 he...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-01-01
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| Series: | Applied Water Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s13201-019-1126-2 |
| _version_ | 1831587499841945600 |
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| author | M. Cihan Aydin Ercan Isik A. Emre Ulu |
| author_facet | M. Cihan Aydin Ercan Isik A. Emre Ulu |
| author_sort | M. Cihan Aydin |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-12-17T21:56:54Z |
| format | Article |
| id | doaj.art-31e53dc6574a476db4e82d2b49ac439d |
| institution | Directory Open Access Journal |
| issn | 2190-5487 2190-5495 |
| language | English |
| last_indexed | 2024-12-17T21:56:54Z |
| publishDate | 2020-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Applied Water Science |
| spelling | doaj.art-31e53dc6574a476db4e82d2b49ac439d2022-12-21T21:31:06ZengSpringerOpenApplied Water Science2190-54872190-54952020-01-011011910.1007/s13201-019-1126-2Numerical modeling of spillway aerators in high-head damsM. Cihan Aydin0Ercan Isik1A. Emre Ulu2Department of Civil Engineering, Bitlis Eren UniversityDepartment of Civil Engineering, Bitlis Eren UniversityDepartment of Civil Engineering, Bitlis Eren UniversityAbstract 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.https://doi.org/10.1007/s13201-019-1126-2DamCavitationComputational fluid dynamicsScale effect |
| spellingShingle | M. Cihan Aydin Ercan Isik A. Emre Ulu Numerical modeling of spillway aerators in high-head dams Applied Water Science Dam Cavitation Computational fluid dynamics Scale effect |
| title | Numerical modeling of spillway aerators in high-head dams |
| title_full | Numerical modeling of spillway aerators in high-head dams |
| title_fullStr | Numerical modeling of spillway aerators in high-head dams |
| title_full_unstemmed | Numerical modeling of spillway aerators in high-head dams |
| title_short | Numerical modeling of spillway aerators in high-head dams |
| title_sort | numerical modeling of spillway aerators in high head dams |
| topic | Dam Cavitation Computational fluid dynamics Scale effect |
| url | https://doi.org/10.1007/s13201-019-1126-2 |
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