Journals / Avrupa Bilim ve Teknoloji Dergisi / 2021 / Sayı: 23

Numerical Analysis of Energy Dissipation Ratio of Stepped Weirs Designed Using Reverse Stepped Thresholds

Ters Basamaklı Eşikler Kullanılarak Tasarlanan Basamaklı Savakların Enerji Sönümleme Oranlarının Sayısal Olarak İncelenmesi

Pages
189–196
Publication Date
2021-04-30
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

According to the results, the stepped weir designed using the reverse step thresholds could dissipate energy up to 18% more than the flat stepped weirs in the skimming flow regime.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Stepped weirs are a type of weir that has been designed for centuries to dissipate the flow energy on the chute channels.
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Key Findings & Data:In this study, the energy dissipation of the weir using reverse step thresholds has been examined with the Flow3D® software.
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Conclusion & Impact:According to the results, the stepped weir designed using the reverse step thresholds could dissipate energy up to 18% more than the flat stepped weirs in the skimming flow regime.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:basamaklı savaklar · Flow3D · Hesaplamalı akışkanlar dinamiği (HAD)

Abstract

Stepped weirs are a type of weir that has been designed for centuries to dissipate the flow energy on the chute channels. Many studies have been done on step geometry and are still being done to improve these weirs. In this study, the energy dissipation of the weir using reverse step thresholds has been examined with the Flow3D® software. A total of 18 analyzes were conducted using three models and six discharges. According to the results, the stepped weir designed using the reverse step thresholds could dissipate energy up to 18% more than the flat stepped weirs in the skimming flow regime. However, this value decreases as it passes towards the nappe flow regime.

Özet

Basamaklı savaklar, şüt kanalı üzerindeki akım enerjisini sönümleyebilmek amacıyla tasarlanan ve yüzyıllardır kullanılan bir savak çeşididir. Bu savakların geliştirilebilmesi amacıyla basamak geometrisi üzerine birçok çalışma yapılmış ve yapılmaya devam etmektedir. Bu çalışma kapsamında, basamak uçlarına eklenen ters basamak geometrisindeki eşiklerin enerji sönümleme oranına etkisi Flow3D® yazılımı ile incelenmiştir. Üç farklı model ve altı farklı debi kullanılarak sürdürülen çalışmada toplam 18 adet analiz yürütülmüştür. Elde edilen sonuçlara göre, her bir basamak ucuna eklenen ters basamaklı eşiklerin, sıçramalı akım şartlarında, klasik basamaklı savaklardan %18’e kadar daha fazla enerji sönümleyebildiği, bu değerin nap akımı rejimine geçildikçe azaldığı gözlenmiştir.

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Cite This Article

IKİNCİOGULLARİ, E. (2021). Numerical Analysis of Energy Dissipation Ratio of Stepped Weirs Designed Using Reverse Stepped Thresholds. Avrupa Bilim ve Teknoloji Dergisi, Sayı: 23, 189–196. https://ajindex.com/articles/471424

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References (13)

  1. Chanson, H. (1998). "Review of Studies on Stepped Channel Flows." Hydraulic Characteristics of Stepped Channel Flows, Workshop on Flow Characteristics around Hydraulic Structures and River Environment, Nihon University, Tokyo, Japan, November, 25 pages. Boes, R.M., (2012). “Guidelines on the design and hydraulic characteristics of stepped spillways”. Commission Internationale Des Grands Barrages, Kyoto, July 2012, Q.94-R.15. Frizell, K.H., and Mefford, B.W. (1991). Designing spillways to prevent cavitation damage. Concrete International, May, pp. 58-64.
  2. Felder, S., & Chanson, H. (2016). Simple design criterion for residual energy on embankment dam stepped spillways. Journal of Hydraulic Engineering, 142(4), 04015062. https://en.wikipedia.org/wiki/New_Croton_Dam#/media/File:New_Croton_Dam_NY1.jpg http://dsi.gov.tr/haberler/2017/04/11/141-y%C4%B1ll%C4%B1k-r%C3%BCya-%C3%A7ine-adnan-menderes-baraj%C4%B1 http://www.suyapi.com.tr/tr/18852/Cine-Baraji-ve-HES http://www.dsi.gov.tr/kurumsal-yapi/yonetim/genel-mudurumuz/calismalari/2012/06/11/izmir40tesis
  3. Özbek, T. (2009). Açık kanal akımlarının hidroliği ve hidrolik yapılar. Teknik Yayınevi.
  4. Rice, C. E., & Kadavy, K. C. (1996). Model study of a roller compacted concrete stepped spillway. Journal of Hydraulic Engineering, 122(6), 292-297.
  5. Felder, S., Fromm, C., & Chanson, H. (2012). Air entrainment and energy dissipation on a 8.9 slope stepped spillway with flat and pooled steps. Berkün, M., (2007).
  6. Su Yapıları Barajlar, Savaklar ve Su Kuvveti Tesisleri. Birsen Yayınevi.
  7. Ohtsu, I., and Yasuda, Y. (1997). Characteristics of flow conditions on stepped channels. Proceedings of the 27th IAHR Biennial Congress, San Francisco, Calif., Theme D, pp. 583–588.
  8. Chanson, H. (1996). Prediction of the transition nappe/skimming flow on a stepped channel. Journal of Hydraulic Research, 34(3), 421-429.
  9. Yasuda, Y., Takahasmı, M., (2000). Characteristics of Skimming Flow over Stepped Spillways. Discussion, Journal of Hydraulic Engineering, 126,11, 869-871.
  10. Peyras, L., Royet, P., and Degoutte, G. (1992). Flow and energy dissipation over stepped gabion weirs. ASCE Journal of Hydraulic Engineering, 118(5): 707-717.
  11. Chanson, H. (1994). State of the art of the hydraulic design of stepped chute spillways, Hydropower Dams J. 33–42.
  12. Chow, V.T. (1959).
  13. Open Channel Hydraulics, McGraw-Hill, New York, USA. Essery, I. T. S., & Horner, M. W. (1971). The hydraulic design of stepped spillways. Construction Industry Research and Information Associati