Volume 23, Issue 3 (Fall 2019)                   jwss 2019, 23(3): 395-407 | Back to browse issues page

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Rezaei Ahvanooei A, Karami H, Mousavi F. Comparison of Hydraulic Performance of Linear and Nonlinear Piano-Key Weirs in Plan. jwss 2019; 23 (3) :395-407
URL: http://jstnar.iut.ac.ir/article-1-3787-en.html
1. Department of Water Engineering and Hydraulic Structures, Faculty of Civil Engineering, Semnan University, Semnan, Iran. , hkarami@semnan.ac.ir
Abstract:   (4255 Views)
In this research, by using FLOW3D, the performance of non-linear (arced) piano key (PKW-NL) in plan and linear piano key weir (PKW-L), with equal length of weir, was compared. Results showed that nonlinearity of the weir caused 20% increase in the discharge coefficient. Investigating the velocity contours for these two weir models also showed that maximum velocity within the PKW-NL weir structure is about 30% lower than the PKW-L weir. Also, the performance of non-linear piano key weir was evaluated under inward (PKW-IC) and outward (PKW-OC) curvatures to the channel. Results showed that in the case of PKW-IC weir, the discharge coefficient was increased by 8% as compared to the PKW-OC weir. Investigating the pressure contours for these two weir models also shows that the average pressure within the PKW-IC weir structure is about 5% higher than the PKW-OC weir. This increase in pressure leads to a decrease in the speed and better distribution of flow over the weir keys.
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Type of Study: Research | Subject: Ggeneral
Received: 2018/10/9 | Accepted: 2019/02/4 | Published: 2019/12/23

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