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بررسی عددی مشخصات هیدرولیکی شیبشکنهای قائم با وجود صفحات مشبک و واگرایی تدریجی دیواره | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 4، دوره 53، شماره 8، آبان 1400، صفحه 3221-3238 اصل مقاله (1.48 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.17779.6671 | ||
| نویسندگان | ||
| بهنام نایب زاده* 1؛ محمد علی لطف للهی-یقین2؛ رسول دانشفراز3 | ||
| 1دانشجوی دکترای رشته عمران دانشگاه تبریز | ||
| 2داشکده عمران - دانشگاه تبریز، تبریز، ایران | ||
| 3دانشیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
| چکیده | ||
| در تحقیق حاضر، به بررسی مشخصات هیدرولیکی شیبشکنهای قائم با صفحات مشبک و واگرایی تدریجی دیواره در پاییندست آن با استفاده از نرمافزار FLOW- 3D پرداخته شد. برای این منظور از صفحات مشبک با نسبت تخلخلهای 40 و 50 درصد، پنج نسبت واگرایی تدریجی به همراه سه ارتفاع شیبشکن قائم در محدوده دبی مشخص استفاده گردید. مشخص شد که نتایج عددی با مدل آشفتگی RNG در مقایسه با k-εبه نتایج آزمایشگاهی نزدیکتر است. همچنین با افزایش ارتفاع شیبشکن از 15 به 25 سانتیمتر، E/E0Δبه دلیل شدت برخورد جت با کف، افزایش و yP/P کاهش مییابد. بیشینهE/E0 Δ مربوط به ارتفاع 25 سانتیمتر به میزان 51/60 درصد و کمترین آن برای ارتفاع 15 سانتیمتر به مقدار 44/25 درصد میباشد. برای یک ارتفاع شیبشکن ثابت با افزایش دبی،E/E0 Δ کاهش و yP/Pافزایش مییابد. واگرایی دیواره موجب تلاطم در کنارهها و توزیع غیریکنواخت عمق در پاییندست آن میشود و ضمن افزایش yP/Pو yd/P باعث افزایش 25 درصدیE/E0 Δ میگردد. وجود صفحات مشبک در پاییندست شیبشکن باعث افزایش yP/P، yd/Pو همچنین افزایش 44 درصدیE/E0 Δ میگردد. استفاده همزمان از واگرایی دیواره و صفحات مشبک در پاییندست شیبشکنها باعث افزایش 46 درصدیE/E0 Δ و کاهش yP/Pو yd/P میشود. ثابت شد که سهم مشارکتی استفاده از صفحات مشبک در مقایسه با واگرایی تدریجی دیواره بیشتر است که با بکارگیری همزمان آنها،E/E0 Δ تا 33/5 درصد افزایش مییابد. | ||
| کلیدواژهها | ||
| شیبشکن قائم؛ نسبت تخلخل؛ مدلهای آشفتگی؛ واگرایی تدریجی دیواره؛ FLOW-3D | ||
| موضوعات | ||
| سازه های هیدرولیکی؛ مهندسی رودخانه؛ هیدرولیک | ||
| عنوان مقاله [English] | ||
| Numerical Investigation of Hydraulic Characteristics of Vertical Drops with Screens and Gradually Wall Expanding | ||
| نویسندگان [English] | ||
| Behnam Nayebzadeh1؛ Mohammad Ali Lotfollahi-yaghin2؛ Rasoul Daneshfaraz3 | ||
| 1PhD civil student in Tabriz University | ||
| 2Professor, ph.d, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran | ||
| 3Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Iran. | ||
| چکیده [English] | ||
| In the present study, the hydraulic characteristics of vertical drops with screens and the gradual wall expanding downstream using FLOW-3D software are investigated. For this purpose, two porosity ratios of the screens of 40 and 50%, 5 gradually expanding with 3 vertical drop heights in the specified discharge range were used. It was found that the numerical results are closer to the experimental results with the RNG turbulence model than k-ε. By increasing the drop height, the ΔE/E0 due to the jet floor impact intensity increased and yp/P value decreased. The maximum ΔE/E0 for 25 cm height was 51.60% and the lowest for 15 cm was 44.25%. For a constant drop height with increasing discharge, the ΔE/E0 decreased and yp/P increased. The gradually wall expanding causes turbulence on the edges and a non-uniform distribution of yd/P and by increasing yp/P and yd/P, it caused a 25% increase in ΔE/E0. The presence of screens increased yp/P, yd/P, and ΔE/E0 by 44%. The simultaneous use of gradually walls expanding and screens caused a 46% increase in ΔE/E0 and a decrease in yp/P and yd/P values. It was shown that the contribution of screens is greater than the gradually wall expanding, with their simultaneous application increasing ΔE/E0 up to 33.5%. | ||
| کلیدواژهها [English] | ||
| Vertical drop, Porosity ratio, Turbulence models, Gradually wall expanding, FLOW-3D | ||
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| مراجع | ||
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Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD. Applied Water Science, 10(1), pp. 1-12, 2020 [27] Nayebzadeh, B., M.A. Lotfolahi-Yaghin, and R. Daneshfaraz, Experimental study of Energy Dissipation at a Vertical Drop Equipped with Vertical Screen with Gradually Expanding at the Downstream. AUT Journal of civil engineering, 2019. (In Persian). DOI: 1022060/CEEJ.2019.16493.6265. | ||
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