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بررسی هیدرولیک سرریزهای جانبی لولایی با آستانه | ||
| تحقیقات آب و خاک ایران | ||
| دوره 56، شماره 1، فروردین 1404، صفحه 229-246 اصل مقاله (2 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2024.382426.669790 | ||
| نویسندگان | ||
| هومن خیبر؛ سید محسن سجادی* ؛ جواد احدیان؛ مهدی قمشی | ||
| گروه سازه های آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| چکیده | ||
| سرریز جانبی یک سازه پرکاربرد است که از آن برای روگذری جریان در مسیل‌ها و کانال‌ها استفاده می‌گردد. در این تحقیق با معرفی نوع جدیدی از سرریزهای جانبی تحت عنوان سرریز جانبی لولایی (گونه‌ای از سرریزهای لبه تیز مایل) با آستانه، به بررسی ضریب دبی و راندمان آن پرداخته شد. آزمایش‌ها در آزمایشگاه هیدرولیک دانشکده مهندسی علوم آب دانشگاه شهید چمران اهواز صورت گرفت. عملکرد مدلهای PSW (سرریز جانبی لولایی با آستانه جریان و کناره‌های سرریز باز)، PSW-C (مدل سرریز جانبی لولایی با آستانه و کناره‌های سرریز بسته) و PSW-HC (مدل سرریز جانبی لولایی با کناره ابتدایی باز و انتهای بسته) نسبت به مدل شاهد R (سرریز جانبی لبه تیز قائم مستطیلی) در مقابل عدد فرود انتهای بالادست جریان در محدوه 3/0 تا 54/0 به ازای یک نسبت عمق بالادست به ارتفاع سرریز ثابت و تحت زوایای بازشدگی 30، 45 و 60 درجه رو به کانال اصلی بررسی گردید. نتایج نشان داد که مدلهای معرفی شده در این تحقیق نسبت به مدل شاهد بهینه‌تر بوده و ضریب دبی و راندمان بیشتری خواهند داشت. محاسبات نشان داد که در مدلهای اصلی، ضریب دبی تا 80 و راندمان تا 70 درصد نسبت به مدل شاهد افزایش خواهد یافت. همچنین در مقایسه مدلهای اصلی با یکدیگر مشاهده گردید که مقدار ضریب دبی و راندمان مدل PSW-HC به طور میانگین در حدود 7 و 5 درصد نسبت به مدل PSW و 22 و 8 درصد نسبت به مدل PSW-C افزایش یافته است. | ||
| کلیدواژه‌ها | ||
| آستانه سرریز؛ راندمان؛ سرریزهای جانبی؛ سرریزهای لولایی؛ ضریب دبی | ||
| عنوان مقاله [English] | ||
| Hydraulic Analysis of Pivot Side Weirs with Sill | ||
| نویسندگان [English] | ||
| Hooman Kheybar؛ Seyed Mohsen Sajjadi؛ Javad Ahadiyan؛ Mehdi Ghomeshi | ||
| Department of Hydraulic Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| چکیده [English] | ||
| The side weir is a widely used structure for the diversion of flow in channels and waterways. In this study, a new type of side weir, referred to as the pivot side weir (a type of inclined sharp-crested weir) with a sill, was introduced to investigate its discharge coefficient and efficiency. The experiments were conducted in the hydraulic laboratory of the Faculty of Water Engineering at Shahid Chamran University of Ahvaz. The performance of the models PSW (pivot side weir with a sill and open overflow sides), PSW-C (pivot side weir with closed overflow sides), and PSW-HC (pivot side weir with an open upstream side and closed downstream end) was evaluated against the control model R (rectangular sharp-crested side weir) in relation to the upstream Froude number ranging from 0.3 to 0.54, under a constant ratio of upstream depth to weir height and at opening angles of 30, 45, and 60 degrees towards the main channel. The results indicated that the models introduced in this study were more efficient than the control model, exhibiting higher discharge coefficients and efficiencies. Calculations showed that in the primary models, the discharge coefficient increased by up to 80% and efficiency by up to 70% compared to the control model. Furthermore, when comparing the primary models with each other, it was observed that the average discharge coefficient and efficiency of the PSW-HC model increased by approximately 7% and 5%, respectively, compared to the PSW model, and by 22% and 8% compared to the PSW-C model. | ||
| کلیدواژه‌ها [English] | ||
| Weir Sill, efficiency, Side Weirs, Pivot Weirs, discharge coefficient | ||
| مراجع | ||
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