Experimental Study of Hydraulic Flow of Circular Piano-Key Inlet in Shaft Spillways
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_CIVLJ-7-3_007
تاریخ نمایه سازی: 23 شهریور 1403
Abstract:
One of the most important conflicts that shaft spillways have to deal with is vortex formation. This phenomenon leads to some unfavorable effects such as vibration in the body of structures, air entrainment and reduced overflow capacity of the spillway. Among all solutions for disrupted vortex formation, an innovative one called circular piano-key spillway, based upon piano key weir principles has not been noticed as well as other solutions. Hence, in this study, experiments were conducted on circular piano-key spillway models. Results showed that in a constant head, the greater amounts of discharge have been measured for circular piano key inlet with an angle of ۹۰ degrees. Comparison between discharge coefficients of three circular piano key inlet models showed that for a constant amount of H/D (Head/Diameter), circular piano key inlet with an angle of ۹۰, ۶۰ and ۴۵ degrees have the greater amount of discharge coefficients, respectively. Experiment results indicated that circular piano-key spillway (with an angle of ۹۰ degrees) increases overflow discharge capacity about ۱۵.۱۶% compared with shaft spillway. Among circular piano key inlets, the model with an angle of ۹۰ degrees has the best hydraulic performance.
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Authors
Zahra Kashkaki
Water Engineering Department, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran
Hossein Banejad
Water Engineering Department, Faculty of Agriculture, Ferdowsi University, Mashhad, Iran
Majid Heydari
Water Engineering Department, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran
Ehsan Olyaie
Young Researchers and Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran
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