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تأثیر آرایش شعاعی صفحات مستغرق در افزایش راندمان رسوبشویی مخزن سد | ||
| دانش آب و خاک | ||
| مقاله 4، دوره 28، شماره 2، تابستان 1397، صفحه 43-56 اصل مقاله (785 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
سمانه کریمی1؛ قربان مهتابی  2
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| 1دانشجوی سابق کارشناسی ارشد سازه‌های آبی، گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان | ||
| 2استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان | ||
| چکیده | ||
| رسوبشویی تحت فشار یک از روشهای رایج در رسوبشویی هیدرولیکی مخازن سد است. در این روش، رسوباتی که در مخزن تهنشین شدهاند، بهوسیله دریچه تخلیه تحتانی سد همراه با جریان آب خروجی تخلیه میشوند. در این تحقیق با کارگذاری صفحات مستغرق با آرایش شعاعی در جلوی تخلیه کننده، تأثیر این آرایش در افزایش قدرت جریان گردابی و افزایش عملکرد رسوبشویی تحت فشار مورد آزمایش قرار گرفت. تأثیر پارامترهای مختلف آرایش شعاعی شامل فاصله میانی صفحات اصلی(Lm)، فاصله مابین صفحات اصلی و جانبی (Ls) و فاصله صفحات جانبی از دیواره (Lv) بر روی این پدیده در سه عمق مختلف آب مخزن (20، 30 و 40 سانتیمتر) بررسی گردید. براساس نتایج، مقادیر بهینه طولهای بیبعد پارامترهای آرایش شعاعی 5/0 Lm/D=، 25/0 Ls/D= و 2/0 Lv/D= بهدست آمد (D، قطر دریچه تخلیه تحتانی). در بهترین آرایش شعاعی صفحات و در شرایط هیدورلیکی مختلف، عملکرد رسوبشویی بهطور متوسط در حدود 33/11 برابر نسبت به مدل شاهد افزایش یافت. در آرایش شعاعی، با افزایش عمق آب مخزن، عملکرد رسوبشویی افزایش یافت. این شرایط یعنی رسوبشویی بیشتر در عمق بالا، یک مزیت نسبی برای اجرای رسوبشویی است. بهعبارت دیگر، عملیات رسوبشویی در حالت مخزن پر راندمان بالایی داشته و نیاز به تخلیه آب مخزن نیست. | ||
| کلیدواژه‌ها | ||
| آرایش شعاعی؛ رسوبشویی؛ صفحات مستغرق اصلی؛ صفحات مستغرق جانبی؛ عمق آب | ||
| عنوان مقاله [English] | ||
| Effect of Radial Arrangement of Submerged Vanes in Increasing the Flushing Efficiency of Dam Reservoir | ||
| نویسندگان [English] | ||
| S Karimi1؛ G Mahtabi2 | ||
| 1M.Sc. Student, Dept., of Water Engineering, Faculty of Agric., Univ. of Zanjan, Zanjan, Iran | ||
| 2Assist. Prof., Dept., of Water Engineering, Faculty of Agric., Univ. of Zanjan, Zanjan, Iran | ||
| چکیده [English] | ||
| Pressurized flushing is one of the common methods in hydraulic flushing of dam reservoirs. In this method, sediments settled in the reservoir are released out together with water flow using the bottom outlet of the dam. In this research, by employing the submerged vanes with radial arrangementin front of the bottom outlet, effect of this arrangement in enhancement of the vortex flow and pressurized flushing efficiency were investigated. The effect of different parameters of radial arrangement including cross distance of the main vanes (Lm), distance between the main and side vanes (Ls) and the distance of vanes from the side wall (Lv) on this phenomenon were investigated in three different water depths of the reservoir (20, 30 and 40 cm). Based on the results, the optimal non-dimensional lengths values of the radial arrangement parameters were obtained as Lm/D=0.5, Ls/D= 0.25 and Lv/D=0.2 (D, diameter of bottom outlet). In the best radial arrangement parameters of the vanes in the different hydraulic condition, flushing efficiency increased about 11.33 times compared to the control model. In radial arrangement, with increasing the water depth of reservoir, the flushing performance increased. This condition, more flushing in high water depth, is a comparative advantage for flushing. In other words, the flushing operation has more efficiency in the full condition of the reservoir and it is not necessary to empty the reservoir. | ||
| کلیدواژه‌ها [English] | ||
| Flushing, Main submerged vanes, Radial arrangement, Side submerged vanes, Water depth | ||
| مراجع | ||
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