بررسی آزمایشگاهی ضریب دبی و خطوط جریان در سرریز جانبی کلید پیانویی ذوزنقه‌ای

نوع مقاله: مقاله پژوهشی

نویسندگان

1 سازه های هیدرولیکی،دانشکده مهندسی عمران،دانشگاه تهران،تهران،ایران.

2 سازه های هیدرولیکی،دانشکده عمران،دانشگاه تهران، تهران ، ایران.

3 پژوهشکده حفاظت خاک وآبخیزداری،سازمان تحقیقات،آموزش و ترویج کشاورزی،تهران ایران.

چکیده

مهمترین کاربرد سرریزهای جانبی، کنترل و انحراف سیلاب و محافظت سازه مربوطه در مخازن سدها و رودخانه‌ها است. این تحقیق طی یک بررسی آزمایشگاهی در کانالی به طول 10 متر، عرض 6/0 متر، ارتفاع 6/0 متر و 16 مدل سرریز ذوزنقه‌ای کلید پیانویی تیپ A  با سه‌پایه متفاوت 10، 15 و 20 سانتی‌متر انجام‌شده است. سرریزهای مذکور در دو حالت قرارگیری در دیواره کانال اصلی قرارگرفته‌اند. نتایج نشان داد که بیشترین میزان ضریب دبی عبوری () مربوط به سرریزهای با cm 15 p= در هر دو حالت 1 و 2 در نسبت بی‌بعد 4/0 > H/P> 2/0 و همچنین در سرریز با نسبت بی‌بعد 5/0 < H/P و cm 20=p می‌باشند. درنهایت سرریز کلید پیانویی ذوزنقه‌ای با cm 15 p= و سرریز با cm 50 B= مناسب‌ترین رژیم جریان را از خود عبور می‌دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Study of Discharge Coefficient and Flow Streamlines in a Trapezoidal Piano Key Side Weir

نویسندگان [English]

  • minasadat seyedjavad 1
  • Seyedtaghi Naeeni 2
  • Mojtaba Sanei 3
1 hydraulic structure,civil engineering collage,tehran university,Tehran,Iran.
2 Hydraulic Structure, Civil engineering collage, Tehran university, Tehran, Iran.
3 Soil and Water Conservation Research Institute, Agricultural Research, Education and Promotion Organization, Tehran, Iran.
چکیده [English]

The main application of spillway in rivers and dams reservoirs is control and diversion of flood and protection of their related structures. In this research, a laboratory study was performed to test 16 trapezoid piano key A type weir models with different pillars 10, 15 and 20 cm in a canal with 10 meters length, 0.6 m width and 0.6 m height. The proposed weirs were placed on the main canal wall with two arrangements. The results showed that the maximum overflow rate coefficient was corresponded to weirs with p=15cm in both arranments (1 and 2) and the dimentionless ratio of 0.4 <H/P> 0.2 0.4 and also to weir with dimentionless ratio of 0.5 <H/P and p=20cm. Finally, the trapezoid piano key weir with a p=15cm and a B=50cm identified to pass the most appropriate flow regime.

کلیدواژه‌ها [English]

  • Discharge coefficient of Piano Key
  • Side Weir
  • and Streamline flow
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