Investigation of Flow Pattern around Rectangular and Oblong Piers with collar Located in a 180o Sharp Bend
نویسندگان
چکیده
Flow in river bends is associated with generation of secondary flows that leads to a rather complicated flow pattern around bridge piers located the bend. In this study, patterns rectangular and oblong models collar at 90o angle 180-degree sharp bend an experimental plume were investigated. The 3D velocity data collected using Vectrino velocimeter. results indicated presence pier caused more intense deviation streamlines towards outer bank Furthermore, installation pier, maximum power angular decreased, respectively, by 35% 45% comparison pier. addition, it was found turbulence kinetic energy two not significantly different, but installing region high values formed 90° near inner bank. Also, reduces shear stress use
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An experimental approach was carried out to study the time development and extension of scouring around a circular pier protected by a collar. The experiments included the study of scouring around an unprotected pier as well as the pier protected with collars located at different levels. Width of collars was 3 times the pier diameter. It was found that with collars, though the scour depth and t...
متن کاملبررسی آزمایشگاهی اثر طوقه در کنترل آبشستگی اطراف پایه پل استوانه‌ای در قوس 180 درجه رودخانه
Every year river flooding causes serious damage to the bridges at the time needed most. One of the most effective factors causing bridge failure is scouring around the piers in a river bend. One of the methods to decrease scouring around the bridge piers is fitting them with a coller on the piers. The collars protect the river bed against vortex flow in the vicinity of the pier base. An experim...
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ژورنال
عنوان ژورنال: Scientia Iranica
سال: 2021
ISSN: ['1026-3098', '2345-3605']
DOI: https://doi.org/10.24200/sci.2021.55320.4169