بررسی آزمایشگاهی ضریب دبی در سرریزهای زیگزاگی قوسی ذوزنقه‌ای با شعاع قوس و طول سیکل متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 گروه علوم و مهندسی آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران.

3 گروه علوم و مهندسی آب، دانشگاه آزاد اسلامی اهواز، ایران.

4 گروه مهندسی علوم آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

سرریزهای کنگره‏‏ای سازه‌هایی هستند که برای انتقال جریان‌های بزرگ در هدهای کم، با افزایش طول مؤثر تاج سرریز با توجه به وسعت کانال طراحی شده‌اند. در این پژوهش سرریزهای کنگره‏ای قوسی ذوزنقه‌ای با شعاع قوس و طول سیکل متفاوت مورد بررسی قرار گرفتند. آزمایش‌های متعددی با استفاده از روش مدل‌سازی فیزیکی برای تعیین تأثیر نسبت شعاع قوس به عرض سیکل میانی (R/w1) و نسبت طول سیکل سرریز به عرض سیکل میانی (B/w1) بر ضریب دبی سرریز، انجام شد. آزمایش‌ها بر روی یک فلوم مستطیلی به طول 6 متر، ارتفاع و عرض 6/0 متر انجام شد. با استفاده از آنالیز ابعادی به روش باکینگهام مشخص شد که ضریب دبی تابع سه پارامتر هد هیدرولیکی، شعاع قوس سرریز و نسبت طولی سرریز خواهد بود. به‌طورکلی نتایج این تحقیق نشان داد با افزایش نسبت شعاع قوس در سرریز کنگره‏ای قوسی دوزنقه‌ای، ضریب دبی تا 3/27 درصد افزایش می‌یابد. همچنین با کاهش نسبت طول سیکل از 5/1=B/w1 به 1=B/w1،ضریب دبی سرریز تا حدود 7/29 درصد افزایش یافت.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental Study of Discharge Coefficient of Trapezoidal Arced Labyrinth Weirs with Different Arc Radius and Cycle Length

نویسندگان [English]

  • Jamal Feili 1
  • Mohammad Heidarnejad 2
  • Amir abbas Kamanbedast 2
  • Alireza Masjedi 3
  • Mehdi Asadi Lor 4
1 Department of Water Science Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 Department of Water Science Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
3 Department of Water Science Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
4 Department of Water Science Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده [English]

Labyrinth weirs are structures for transferring large flows at low heads, in which the effective length of crest for a given channel width is increased. In this study trapezoidal arced labyrinth weirs with different arc radius and cycle length were investigated. Several experiments were conducted using physical models to evaluate the effect of R/w1 (ratio of arc radius to middle cycle width) and B/w1 (ratio of weir length in flow direction to middle cycle width) on weir discharge coefficient. The experiments were carried out using a 6 m long test flume with cross section of 0.6 m width and 0.6 m height. Using Buckingham method of dimensional analysis, it was found that the discharge coefficient is a function of three variables; hydraulic head, arc radius of weir and weir length ratio. In general, the results of this study showed by increasing arc radius ratio, discharge coefficient of trapezoidal arced labyrinth weir increases up to 27.3%. Besides, by decreasing the weir length ratio from 1.5 to 1, discharge coefficient increased up to 29.7%.

کلیدواژه‌ها [English]

  • labyrinth weir
  • discharge coefficient
  • hydraulic model
  • trapezoidal arced labyrinth weir

مراجع

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تحقیقات آب و خاک ایران
دوره 51، شماره 5
مرداد 1399
صفحه 1115-1126

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