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بررسی آزمایشگاهی تأثیر شیب مثبت صفحات مشبک افقی بر روی مشخصات هیدرولیکی شیبشکن قائم | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 9، دوره 50، شماره 10، اسفند 1398، صفحه 2499-2509 اصل مقاله (1.03 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.283685.668238 | ||
| نویسندگان | ||
| رسول دانشفراز* 1؛ ودود حسن نیا2؛ رضا میرزایی3؛ علی بازیار4 | ||
| 1گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
| 2گروه مهندسی عمران، دانشکده فنی مهندسی، مراغه، مراغه، ایران | ||
| 3گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه،مراغه،ایران | ||
| 4دانشجوی کارشناسی ارشد عمران آب و سازه های هیدرولیکی، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
| چکیده | ||
| در تحقیق حاضر، 105 آزمایش با هدف بررسی تأثیر شیب صفحات مشبک افقی بر روی مشخصات هیدرولیکی شیبشکن قائم با جریان زیربحرانی در بالادست انجام شد. آزمایشها در دو مدل شیبشکن قائم ساده و شیبشکن قائم مجهز به صفحات مشبک افقی و شیبدار (سه شیب) با دو نسبت تخلخل تنظیم شد. بازه عمق بحرانی نسبی از 07/0 تا 24/0 بوده و شیب صفحات مشبک افقی ◦7، ◦14 و ◦21 و نسبت تخلخل صفحات مشبک برابر با دو مقدار 40 و 50 درصد درنظر گرفته شد. پارامترهای طول نسبی خیسشده، طول نسبی تلاطم، عمق نسبی استخر، عمق نسبی پاییندست و انرژی باقیمانده نسبی مورد بررسی قرار گرفت. در تمامی حالات مورد بررسی با افزایش عمق بحرانی نسبی، پارامترهای طول نسبی تلاطم، عمق نسبی استخر، عمق نسبی پاییندست و انرژی باقیمانده نسبی افزایش مییابند. نتایج نشان داد که با افزایش شیب صفحات مشبک، پارامترهای طول نسبی خیسشده، طول نسبی تلاطم و عمق نسبی استخر افزایش مییابند. این در حالی است که شیب صفحات مشبک تأثیر چندانی بر روی عمق نسبی پاییندست و انرژی باقیمانده نسبی ندارد. همچنین مشاهده گردید که افزایش تخلخل صفحات مشبک باعث کاهش پارامترهای طول نسبی خیس شده، طول نسبی تلاطم و عمق نسبی استخر و افزایش عمق نسبی پاییندست میگردد. این در حالی است که تخلخل صفحات مشبک بر روی انرژی باقیمانده نسبی بی‌تأثیر است. | ||
| کلیدواژه‌ها | ||
| انرژی باقی مانده نسبی؛ تخلخل؛ شیبشکن قائم؛ شیب صفحه مشبک افقی | ||
| عنوان مقاله [English] | ||
| Experimental Investigation of the Effect of Positive Slope of the Horizontal Screen on Hydraulic Characteristics of Vertical Drop | ||
| نویسندگان [English] | ||
| Rasoul Daneshfaraz1؛ vadoud hasanniya2؛ Reza Mirzaei3؛ Ali Bazyar4 | ||
| 1Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Iran. | ||
| 2Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran. | ||
| 3Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran. | ||
| 4Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Iran. | ||
| چکیده [English] | ||
| In the present study, 105 tests were carried out to investigate the effect of horizontal screen slope on hydraulic characteristics of vertical drop with the subcritical flow in upstream. The experiments were arranged in two models, plain vertical drop and vertical drop equipped with horizontal and sloping (three slopes) screens in two porosity ratios. The range of relative critical depth was from 0.07 to 0.24 the screen slopes were 7◦, 14◦, 21◦, and the screen porosities were considered to be 40% and 50%. The relative wetted length of the screen, the relative turbulance length, the relative depth of pool, the relative downstream depth, and the relative residual energy were analyzed. In all cases, by increasing the relative critical depth, the turbulance length, pool depth, downstream depth, and relative residual energy were increased. The results showed by increasing the slope of screen, the characteristics of the relative wetted length of the horizontal screen, relative turbulance length, and relative pool depth increases. However, the slope of screen has no effect on the relative downstream depth and the relative residual energy. It was also observed that with increasing porosity ratio of the screen, the characteristics of the relative wetted length of the horizontal screen, relative turbulance length, and relative pool depth decreases, and the relative downstream depth increases. But the porosity of screens has an insignificant effect on the relative residual energy. | ||
| کلیدواژه‌ها [English] | ||
| Porosity, relative residual energy, slope of the horizontal screen, vertical drop | ||
| مراجع | ||
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