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بررسی آزمایشگاهی عملکرد صفحات مشبک افقی در استهلاک انرژی شیبشکنهای مایل | ||
تحقیقات آب و خاک ایران | ||
مقاله 13، دوره 51، شماره 2، اردیبهشت 1399، صفحه 441-453 اصل مقاله (768.61 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2019.288653.668312 | ||
نویسندگان | ||
رسول دانشفراز* 1؛ مهدی ماجدی اصل2؛ علی بازیار3 | ||
1دانشیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه | ||
2استادیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
3دانشجوی کارشناسی ارشد عمران آب و سازههای هیدرولیکی، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، ایران | ||
چکیده | ||
در تحقیق حاضر، از صفحات مشبک افقی در لبه شیبشکن مایل به عنوان سازه مستهلککننده انرژی جهت افزایش میزان استهلاک انرژی در پاییندست استفاده شد. آزمایشهای مربوطه در سه زاویه، دو ارتفاع شیبشکن و دو نسبت تخلخل صفحات مشبک انجام گرفت. در مجموع، 108 آزمایش متفاوت در محدوده دبی 200-700 لیتر در دقیقه انجام شد. نتایج نشان داد استهلاک انرژی با افزایش طول نسبی خیس شده صفحات مشبک افزایش مییابد، بهطوری که بیشترین استهلاک انرژی در صفحه مشبک افقی با تخلخل 40 درصد رخ داد. مجهز نمودن شیبشکن مایل به صفحات مشبک افقی، اعداد فرود پاییندست را نیز در سه زاویه و دو نسبت تخلخل، از بازه 49/4 الی 35/8 به بازه 48/1 الی 78/5 کاهش داد. همچنین افزایش زاویه شیبشکن مایل سبب افزایش عمق نسبی پاییندست شد، بهگونهای که شیبشکن مایل مجهز به صفحه مشبک افقی با زاویه 45 درجه و تخلخل 40 درصدی صفحات، بهترین عملکرد در افزایش عمق نسبی پاییندست را به خود اختصاص دادند. افزایش زاویه و تخلخل صفحات مشبک نیز باعث کاهش متوسط راندمان استهلاک انرژی میشود. | ||
کلیدواژهها | ||
استهلاک انرژی؛ صفحات مشبک افقی؛ شیبشکن مایل؛ طول نسبی خیس شده | ||
عنوان مقاله [English] | ||
Experimental Investigation of the Performance of Horizontal Screen on Energy Dissipation in Inclined Drop | ||
نویسندگان [English] | ||
Rasoul Daneshfaraz1؛ Mahdi Majedi Asl2؛ Ali Bazyar3 | ||
1Associate Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran. | ||
2Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran. | ||
3M.Sc. Student, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran | ||
چکیده [English] | ||
In the present study, horizontal screens at brink of inclined drop were used as an energy dissipater structure to increase the downstream energy dissipation. The experiments were carried out in three angles of drop, two drop heights, and two porosity ratios of horizontal screen. In total, 108 experiments were performed in discharge range of 200–700 L/min. The results showed that the energy dissipation increases with increasing relative wetting length of the screen, such a way that the highest energy dissipation occurs in the horizontal screen with a porosity of 40%. Inclined drop equipped with horizontal screen reduced downstream Froude numbers in three angles of drop and two porosity ratios from a range of 4.49 - 8.35 to a range of 1.48 - 5.78. Also, increasing the angle of drop increases the relative depth of downstream, so that the drop angle of 45 ° and screen porosity of 40% had the best performance in increasing the relative depth of downstream. Increasing the drop angle and screen porosity also reduces the average efficiency of energy dissipation. | ||
کلیدواژهها [English] | ||
energy dissipation, horizontal screen, inclined drop, relative wetted length | ||
مراجع | ||
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