نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

2 دنش آموخته دکتری، گروه آب و سازه‌های هیدرولیکی، دانشکده فنی مهندسی، دانشگاه زنجان، ایران

3 دانشجوی کارشناسی ارشد، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

چکیده

کنترل انرژی اضافی جریان هنگام استفاده از شوت‌ مایل برای انتقال آب از مسائل مهم هیدرولیکی است. در پژوهش حاضر، تأثیر شکل هندسی بلوک­ها و فواصل طولی اجرا شده بر روی شوت در زوایای مختلف بر میزان استهلاک انرژی جریان عبوری ارزیابی شد. آزمایش­ها بر روی سه شوت با زوایای 20، 23 و °6/26 و با پنج شکل هندسی مختلف از بلوک­ها و در سه فواصل طولی مختلف H 5/1، H 2 و H 5/2 (H ارتفاع بلوک) نسبت به هم درنظر گرفته شدند. نتایج نشان داد که میزان استهلاک انرژی بر روی مدل­های شوت بدون مانع بین­ 38/21 تا 22/66% است. ایجاد بلوک بر روی شوت باعث ایجاد سطح مقاومتی در برابر جریان شده و اختلاف بین نرخ استهلاک انرژی در مدل­های شوت با مانع نسبت به شوت بدون مانع، بین 21 تا 61% است. با افزایش زاویه شوت از ­°20 تا °6/26 ، میزان استهلاک انرژی جریان در شوت بدون مانع و شوت مانع­دار به‌ترتیب 22 و 6% کاهش می­یابد. افزایش فاصله طولی بین بلوک­ها، باعث کاهش استهلاک انرژی در تمامی مدل­ها می­شود. برای مدل برتر، افزایش %66 در فاصله طولی بین بلوک­ها باعث کاهش 10% در میزان استهلاک انرژی می­شود. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Angle and Geometric Shape of Block on Flow Energy Dissipation in Baffled Chute

نویسندگان [English]

  • Rasoul Daneshfaraz 1
  • Amir Ghaderi 2
  • Alireza Bagheri 3

1 Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran

2 PhD Alumni, Department of Water and Hydraulic Structures, Faculty of Engineering, University of Zanjan, Zanjan, Iran

3 M. Sc. Student, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran

چکیده [English]

Controlling the excess flow energy when using the inclined chute to transfer water is always one of the important hydraulic issues. In the present study, the effect of determining how the shape of the blocks and the longitudinal distance between them affects the energy dissipation under various angles of chutes was evaluated experimentally. The experiments were carried out on three chutes with angles of 20, 23, and 26.6 degrees, five different geometric shapes of blocks, and three different longitudinal distances of 1.5H, 2H, and 2.5H (H is block height). The results indicated that the energy dissipation rate on smooth chute models was between 21.38 to 66%. The baffles on the chute create the flow resistance, and the difference between the energy dissipation rate in baffled chute models compared to smooth chutes is between 21 and 61%. By increasing the angle of the chute from 20 to 26.6 degrees, the energy dissipation on smooth and baffled chutes decreases by 22 and 6%, respectively. Increasing the longitudinal distance between the blocks reduces energy dissipation in all models. For the superior model, a 66% increase in the longitudinal distance between the blocks decreases the energy dissipation rate by 10%.

کلیدواژه‌ها [English]

  • Angle of Chute
  • Baffled Chute
  • Energy Dissipation
  • Shape of Block
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