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مهندسی عمران مدرس، جلد ۱۹، شماره ۱، صفحات ۰-۰
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| عنوان فارسی |
بررسی عددی اثر تغییر منحنی استاندارد سرریزهای سه‌جانبی در بهبود عملکرد هیدرولیکی آن‌ها |
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| چکیده فارسی مقاله |
سرریزهای سه‌جانبی از جمله مجراهای تخلیه کننده سدها بوده که علیرغم محدودیت‌های هیدرولیکی، در شرایط خاص توپوگرافی به عنوان بهترین انتخاب مطرح می‌شوند. سرریزهای سه‌جانبی دارای برخی شرایط هیدرولیکی نامناسب هستند که به‌عنوان نمونه می‌توان به تلاطم و آشفتگی جریان، اتلاف انرژی و نیز وارد آمدن ضربات نوسانی شدید آب بر تمامی وجوه سرریز اشاره کرد. در تحقیق حاضر شبیه‌سازی عددی میدان جریان سه‌بعدی پیرامون سرریز جانبی U شکل و آبپایه واقع در انتهای کانال جانبی با استفاده از نرم افزار Flow3D مورد توجه قرار گرفته است. در ادامه با پله‌ای نمودن منحنی استاندارد سرریز اوجی سه جانبی، میزان تغییر در عمق جریان و نوسانات فشار دینامیکی در کانال جانبی مورد ارزیابی قرار گرفته است. برای بررسی کمی نوسانات فشار دینامیکی از عدد بدون بعد پارامتر آشفتگی استفاده شده است. نتایج نشان می‌دهد پلکانی نمودن منحنی استاندارد این نوع سرریز موجب کاهش برخورد سفره‌های ریزشی جریان و افزایش عمق جریان در کانال جانبی می‌گردد. از سویی دیگر تغییر منحنی استاندارد، کاهش قابل توجه شدت نوسانات فشار در داخل کانال جانبی را به دنبال دارد. |
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| کلیدواژه‌های فارسی مقاله |
سرریز سه‌جانبی،عملکرد هیدرولیکی،منحنی پلکانی،شبیه‌سازی عددی، |
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| عنوان انگلیسی |
Numerical Investigating the Effect of Changing the Ogee Profile of Three-Sided Spillways on Improving their Hydraulic Performance |
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| چکیده انگلیسی مقاله |
Three-sided spillways are one of the important dam's outlet works that despite their hydraulic limitations, selected as the best option in storage dam under special topographical conditions. Considerable energy losses, the flow high turbulences, and applying great fluctuations shock on walls and bed of the side channel are the hydraulic conditions that must carefully considered in these spillways. In this study, the three-dimensional flow filed of U-shaped spillway and end-sill of the side channel are simulated using Flow3D and the effect of flow turbulences have been modelled by RNG closure. Comparison of the numerical and experimental results revealed that this model with RNG closure has capable to carefully simulate the turbulence flow field on these structures. The effect of making stepped the ogee profile of the three-sided spillway on flow depth and dynamic pressure fluctuations has been numerically evaluated; the non-dimensional turbulence index has been used to investigate the fluctuations of the dynamic pressure. The results revealed making stepped the ogee profile causes to reduce the encounter of the side overfalls, and to increase the flow depth in the side channel, in which this lead to considerable decrease in pressure fluctuation intensity. Three-sided spillways are one of the important dam's outlet works that despite their hydraulic limitations, selected as the best option in storage dam under special topographical conditions. Considerable energy losses, the flow high turbulences, and applying great fluctuations shock on walls and bed of the side channel are the hydraulic conditions that must carefully considered in these spillways. In this study, the three-dimensional flow filed of U-shaped spillway and end-sill of the side channel are simulated using Flow3D and the effect of flow turbulences have been modelled by RNG closure. Comparison of the numerical and experimental results revealed that this model with RNG closure has capable to carefully simulate the turbulence flow field on these structures. The effect of making stepped the ogee profile of the three-sided spillway on flow depth and dynamic pressure fluctuations has been numerically evaluated; the non-dimensional turbulence index has been used to investigate the fluctuations of the dynamic pressure. The results revealed making stepped the ogee profile causes to reduce the encounter of the side overfalls, and to increase the flow depth in the side channel, in which this lead to considerable decrease in pressure fluctuation intensity. Three-sided spillways are one of the important dam's outlet works that despite their hydraulic limitations, selected as the best option in storage dam under special topographical conditions. Considerable energy losses, the flow high turbulences, and applying great fluctuations shock on walls and bed of the side channel are the hydraulic conditions that must carefully considered in these spillways. In this study, the three-dimensional flow filed of U-shaped spillway and end-sill of the side channel are simulated using Flow3D and the effect of flow turbulences have been modelled by RNG closure. Comparison of the numerical and experimental results revealed that this model with RNG closure has capable to carefully simulate the turbulence flow field on these structures. The effect of making stepped the ogee profile of the three-sided spillway on flow depth and dynamic pressure fluctuations has been numerically evaluated; the non-dimensional turbulence index has been used to investigate the fluctuations of the dynamic pressure. The results revealed making stepped the ogee profile causes to reduce the encounter of the side overfalls, and to increase the flow depth in the side channel, in which this lead to considerable decrease in pressure fluctuation intensity. |
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| کلیدواژه‌های انگلیسی مقاله |
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| نویسندگان مقاله |
حامد تقی زاده | H. Taghizadeh
PhD Student of Hydraulic Structure, Faculty of Engineering, Urmia University
دانشجوی دکترا، دانشکده فنی و مهندسی، دانشگاه ارومیه
ابوالفضل ارزنلو | Abolfazl Arzanlou
tehran central azad university
دانشگاه آزاد واحد تهران مرکز دانشکده فنی گروه عمران و مدریت ساخت
نازیلا کاردان | N. Kardan
Assistant Professor, Department of Civil Engineering, Azarbaijan Shahid Madani University
استادیار گروه مهندسی عمران دانشگاه شهید مدنی آذربایجان
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| نشانی اینترنتی |
http://journals.modares.ac.ir/browse.php?a_code=A-16-18328-1&slc_lang=fa&sid=16 |
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