Experimental investigation of turbulent flow upstream of the broad-crested weir
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI, cilt.26, sa.3, ss.455-461, 2020 (ESCI)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 26 Sayı: 3
- Basım Tarihi: 2020
- Doi Numarası: 10.5505/pajes.2019.09225
- Dergi Adı: PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), TR DİZİN (ULAKBİM)
- Sayfa Sayıları: ss.455-461
- Anahtar Kelimeler: Open channel, Broad-crested weir, Turbulent flow, Acoustic doppler velocimetry (ADV), PRESSURE DISTRIBUTIONS, VELOCITY, PROFILES
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Çanakkale Onsekiz Mart Üniversitesi Adresli: Hayır
Özet
Broad crested weirs (BCW) are widely used hydraulic structures in streams and irrigation canals to control the flow and to measure the discharge. In this study, turbulent flow structure at the upstream of the sharp edged broad crested weir is investigated by means of Acoustic Doppler Velocimetry (ADV) measurements at different stations. Vertical distributions of velocity and turbulence stresses revealed that, while fully developed velocity distributions are observed at stations far from the weir, turbulence effects significantly alter the flow structure as the flow approaches to the weir. High-resolution photographs are digitized to extract water surface profiles of the flow through the weir for different flow rates. Comparison of the experimental results with the theoretical results shows that the accuracy of the theoretical solutions decreases for low flow rates, in which boundary-layer effects are calculated based on the power law.