بررسی آزمایشگاهی آبگذری سرریز کلیدپیانویی مستطیلی با دیوارهای جانبی شیبدار

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
1 تربیت مدرس
2 دانشگاه تربیت مدرس
چکیده
در این مقاله نتایج آزمایش­های انجام شده روی آبگذری سرریز کلیدپیانویی مستطیلی شکل ارایه شده است. آزمایش­ها با استفاده از دو مدل سرریز کلیدپیانویی با تاج دیوارهای جانبی افقی و شیب­دار و دبی بین۵۰ تا ۱۸۰ لیتر بر ثانیه انجام شد. سرریزهای کلیدپیانویی با نسبت طول به عرض ۱:۳ استفاده شد. نتایج نشان داد که تراز سطح آب در بالادست سرریز با تاج دیوارهای جانبی شیب­دار، نسبت به سرریز با تاج دیوارهای جانبی افق، 11.02 درصد افزایش ‌یافت. درحالی‌که ضریب آبگذری سرریز با تاج دیوارهای جانبی شیب­دار، در مقایسه با سرریز با تاج افقی، بطور متوسط 4.8 درصد افزایش نشان داد. همچنین کارایی سرریز با تاج دیوارهای جانبی شیب­دار به‌طور متوسط 7.3 درصد بیش از سرریز با تاج افقی می­باشد. رابطه­ای جدید نیز برای محاسبه ضریب آبگذری برای سرریز با تاج افقی و تاج شیب­دار ارایه شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental Study on Flow Over Rectangular Piano Key Weirs with Slopped Side Crests

نویسندگان English

M. Ghodsian 1
H. sohrabzadeh anzani 2
1 TMU
چکیده English

Abstract

In this paper results of experiments on discharge coefficient of rectangular Piano key weirs are presented. Experiments were conducted using two Piano key weirs: one with sloped side walls crest and the other one with horizontal crest. Piano Key weirs with constant value of ratio of length to width were used. The results showed that water level upstream of weir with sloped side walls crest increased by about 11.02 percent. The discharge coefficient of weir with sloped side walls crest increased by about 4.8 percent. The efficiency of weir with sloped side wall crest is increases by about 7.3 percent. New equation for prediction of discharge coefficient of rectangular Piano key weir with sloped side walls crest and horizontal crest was obtained.

کلیدواژه‌ها English

Rectangular piano key weir
sloped crest
Discharge coefficient
Dam
River
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