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بررسی آزمایشگاهی استهلاک انرژی در شیبشکنهای قائم مجهز به صفحات مشبک افقی با جریان فوق بحرانی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 11، دوره 50، شماره 6، آبان 1398، صفحه 1421-1436 اصل مقاله (569.89 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.269301.668053 | ||
| نویسندگان | ||
| رسول دانشفراز* 1؛ سینا صادق فام2؛ ودود حسن نیا3 | ||
| 1دانشیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران. | ||
| 2استادیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
| 3دانشجوی کارشناسی ارشد، گروه مهندسی عمران، دانشگاه مراغه، مراغه، ایران | ||
| چکیده | ||
| در این مطالعه با هدف افزایش استهلاک انرژی در شیبشکنهای قائم با جریان فوق بحرانی در بالادست، از صفحات مشبک به صورت افقی در لبه شیبشکن قائم به عنوان مستهلککننده انرژی اضافی جریان استفاده گردید. آزمایشها برای یک شیبشکن قائم ساده و شیبشکن مجهز به صفحات مشبک با دو نسبت تخلخل و سه بازشدگی دریچه تنظیم گردید. در طی آزمایشها مشاهده شد که صفحه مشبک افقی بعد از شیبشکن، با تقسیم جت در حال سقوط به تعداد بسیار زیادی از جتهای کوچک عمودی باعث افزایش تداخل هوا و تلاطم در داخل استخر گردید. مقایسه نتایج نشان داد که استفاده از این صفحات در شیبشکنهای قائم باعث افزایش عمق نسبی پاییندست، عمق نسبی استخر و استهلاک انرژی نسبی نسبت به شیبشکن قائم ساده میگردد. همچنین با بررسی نتایج مشخص گردید که با افزایش عدد فرود بالادست و کاهش عمق بحرانی نسبی، استهلاک انرژی نسبی افزایش مییابد. این درحالی است که تخلخل صفحات مشبک تأثیری بر روی این پارامتر ندارد. بررسی و مقایسه نتایج مربوط به شیبشکنهای قائم ساده و مجهز به صفحه مشبک نشان داد که استفاده از صفحات مشبک افقی در این سازهها باعث کاهش طول حوضچه آرامش و حذف سازه حوضچه آرامش میگردد. | ||
| کلیدواژه‌ها | ||
| شیبشکن قائم؛ مستهلک کننده؛ عدد فرود؛ عمق پاییندست | ||
| عنوان مقاله [English] | ||
| Experimental Investigation of Energy Dissipation in Vertical Drops Equipped with a Horizontal Screen under Supercritical Flow | ||
| نویسندگان [English] | ||
| Rasoul Daneshfaraz1؛ Sına Sadeghfam2؛ vadoud Hasanniya3 | ||
| 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 this study, horizontal screens were used in the edge of vertical drops, as an excessive energy dissipater of flow, to increase dissipation of energy in vertical drops with the supercritical flow at upstream. Experiments adjusted for a simple vertical drop and a drop equipped by screens with two porosity values and three openings of the upstream sluice gate. During the experiments, it was observed that the horizontal screen after drop increased the air entrance and turbulence in the pool due to dividing the falling jet into a large number of small vertical jets. The results indicate that using these plates in the vertical drops increases the relative depth of downstream, relative depth of pool and relative energy dissipation as compared to a simple vertical drop. Also, results showed by increasing the upstream Froude number and decreasing the relative critical depth, the relative energy dissipation increases. However, the porosity of screens has not a significant effect on energy dissipation. Investigation and comparison of the results corresponded to the simple vertical drops and the ones equipped with screens indicated that incorporating the horizontal screens in these structures eliminate or decrease the length of stilling ponds. | ||
| کلیدواژه‌ها [English] | ||
| vertical drop, dissipator, Froude number, downstream depth | ||
| مراجع | ||
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