محاسبه ضریب عبوردهی سرریز نیلوفری پلکانی و غیرپلکانی و بررسی رفتار آن با استفاده از گرداب شکن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، گروه مهندسی عمران، موسسه غیرانتفاعی تابناک، لامرد، ایران

2 گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد فیروزآباد (مرکز میمند)، فارس، ایران

3 استادیار، دانشکده مهندسی، دانشگاه آزاد اسلامی ‌‌واحد سپیدان، فارس، ‌ایران

10.22034/cpj.2022.04.02.1139

چکیده

بطور کلی سرریزها به دو نوع خطی و غیر خطی تقسیم می‌شوند که در میان آن‌ها، سرریز نیلوفری از نوع سرریز غیر خطی بشمار می‌رود. در برخی از مواقع عملکرد هیدرولیکی سرریز تحت تاثیرضریب استغراق قرار می‌گیرد و راندمان هیدرولیکی آن کاهش و تحت تاثیر استغراق قرار می‌گیرد. و باید از سازه‌هایی همچون گرداب شکن (جدا کننده خطوط جریان جهت افزایش راندمان گذر) و جهت افزایش کارایی سرریز استفاده نمود. در این راستا با استفاده از آنالیز ابعادی به روش باکینگهام مشخص شد ضریب آبگذری سرریز تابع متغیرهایی همچون نسبت ارتفاع گرداب شکن (Hvb/Rs)، نسبت ضخامت گرداب شکن (Tvb/Rs)، تعداد گرداب شکن (VB) و فاکتور شکل سرریز(Sf)  می‌باشد. آزمایشات تحقیق حاضر بر روی‌یک فلوم به شکل مربع و با ابعاد 5/2×5/2 و به ارتفاع 2 متر 20/1× 05/1× 911/0 مترمکعب انجام شد. نتایج نشان داد سرریز نیلوفری پلکانی (12پله) و گرداب شکن با ارتفاع زیاد و با آرایش 6 تایی در مقایسه با سرریز غیرپلکانی دارای عملکرد بسیار  بهتر و مناسب‌تر می‌باشد و باعث افزایش ضریب آبگذری به میزان 23% شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Calculating the Overflow Coefficient of Stepped and Non-Stepped Morning Glory Spillway and Investigating its Behavior Using antiVortex blades

نویسندگان [English]

  • Saeed Radmanesh 1
  • Amirhossein Bazaee 2
  • Roozbeh Aghamajidi 3
1 M.Sc., Department of Civil Engineering, Tabnak Non-Profit Institute, Lamerd, Iran
2 Department of Civil Engineering, Islamic Azad University, Firoozabad Branch (Meymand Center), Fars, Iran
3 Assistant Professor, Faculty Of Engineering, Islamic Azad University, Sepidan Unit, Fars, Iran
چکیده [English]

In general, Spillway are divided into two types linear and non-linear, among which, the Morning Glory overflow is a non-linear overflow. In some cases, the hydraulic performance of the overflow is affected by the immersion coefficient and its hydraulic efficiency is reduced and affected by the immersion. Structures such as vortex breakers (separators of flow lines to increase transit efficiency) and to increase overflow efficiency should be used. In this regard, using dimensional analysis by Buckingham method, it was determined that the overflow coefficient of the overflow is a function of variables such as vortex breaker height ratio (Hvb / Rs), vortex breaker thickness ratio (Tvb / Rs), number of vortex breakers (VB) and overflow shape factor ( Sf) is. The experiments of the present study were performed on a square flume with dimensions of 2.5 × 2.5 and a height of 2 m 0.20 1 1.05 /0 1.05 m3. The results showed that the overflow of stepped Morning Glory (12 steps) and vortex breaker with high height and 6-array arrangement has a much better and more suitable performance compared to non-stepped overflow and has increased the permeability coefficient by 23%.

کلیدواژه‌ها [English]

  • Stepped Morning Glory Spillway
  • non-stepped Morning Glory Spillway
  • vortex breaker
  • Spillway coefficient
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Mohammad Rafi Rafiei, Roozbeh Aghamajidi "Estimation And Estimation Of The Useful Life Of The Dam Under The Influence Of Incoming Sediments Using Karun 92 Software" Bi-Quarterly Journal Of Water Engineering, Volume: 8, Issue: 3, 2013. (in persian)
R Aghamajidi(2014). Computerized simulation of hydraulic behavior of shaft spillway vortex breaker on crest and semi long stepped chamber throatTechnical Journal of Engineering and Applied Sciences 23 (3), 3325-3332
Sara Amirzadeh, Roozbeh Aghamjidi "Study And Analysis Of The Sensitivity Of Indicators Affecting The Dynamic Pressure Of GRP Pipes In Water Supply Projects (Case Study Of Water Supply Project In Songhar City Of Kermanshah)" Bi-Quarterly Journal Of Water Engineering, Volume: 9, Issue: 3, 1400. (in persian)
Amin Hojjatkhah, Roozbeh Agha Majidi "Laboratory Study Of The Effect Of The Shape Of The Deflector Structure On The Scour Depth Around The Bridge Pier" Hydraulic Quarterly, Volume: 17, Issue: 1, 1401. (in persian)
Reza Momenzadeh, Roozbeh Aghamajidi "Investigation Of The Effects Of Diameter Change, Pipe Thickness And Different Flow Velocities On The Dynamic Loads Due To Ram Impact In Water Supply Lines" 17th Iranian Hydraulic Conference, 1397. (in persian)
Kazem Bahmani Rad, Roozbeh Aghamajidi "Study And Analysis Of The Causes Of Failure Of Earth Dams And Its Consequences Numerically Case Study: Darvardzan Dam" First National Conference On Infrastructure Engineering, 1397. (in persian)
Reza Afshari, Roozbeh Aghamjidi "Investigation Of The Effect Of Diversion Flow On The Amount Of Sediments Entering The Lateral Catchments In The 180 Degree Arc And Hydraulic Conditions Around The Pipe On The Trapping Efficiency" Journal Of Water Engineering, Volume: 7, Issue: 2, 1398. (in persian)
Amin Moradi, Roozbeh Aghamajidi "Investigation Of The Effect Of Diversion Flow On The Amount Of Sediments Entering The Lateral Catchments At 180 ° And Hydraulic Conditions Around The Pipe On The Trapping Efficiency" Second National Conference On Water And Hydraulic Structures, 1397. (in persian)
Mohammad Hossein Mohebbi "Numerical Study And Analysis Of The Effect Of Mixing Intensity In The Body Of Concentrated Flow Using Different Turbulence Models" Second National Conference On Water And Hydraulic Structures, 1397. (in persian)
Masoud Haghbin, Ahmad Sharafati, Roozbeh Aghamajidi, Seyed Babak Haji Seyed Asadollah, Mohamadreza Hosseinian Moghadam Noghani, María L Jalón(2022) Determination of discharge coefficient of stepped morning glory spillway using a hybrid data-driven methodFlow Measurement and Instrumentation 85, 102161
Amir Hossein Nozari, Roozbeh Aghamajidi "Laboratory Study Of The Simultaneous Effect Of Sharp Corner Roughness And Positive Slope On The Length Of Hydraulic Jump In Classical Relaxation Ponds" Journal Of Water Engineering, Volume: 7, Issue: 4, 1397. (in persian)
J Jafari, R Aghamajidi(2022). optimizing geometric dimensions and vortex breaker of morning glory spillway using genetic algorithm: Case study of physical model of San Louis Forebay Dam in California, USA. International Journal of Health Sciences 6 (s3), 3926-3942