ارزیابی تأثیر تغییرات هندسه و موقعیت آستانه بر ضریب دبی دریچه کشویی عمودی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه

چکیده

هدف از تحقیق حاضر، بررسی ضریب دبی دریچه کشویی با آستانه در موقعیت ­های مختلف قرارگیری می ­باشد. برای نیل به این هدف، تأثیر آستانه با اشکال هندسی نیم­ استوانه، استوانه، هرمی و مکعب­ مستطیلی در عرض­ های متفاوت 5/7، 01 و 01 سانتی­متر در سه موقعیت آستانه در زیر دریچه کشویی، آستانه به حالت مماس بر پایین­دست و آستانه به­ صورت مماس بر بالادست دریچه کشویی به صورت آزمایشگاهی، مورد بررسی قرار گرفت. بررسی موقعیت قرارگیری آستانه نشان داد که آستانه با اشکال هندسی هرمی، نیم ­استوانه ای، استوانه­ ای و مکعب­ مستطیلی ضریب دبی جریان در حالت مماس بر پایین­ دست دریچه کشویی در آستانه به عرض 01 سانتی­متر را نسبت به موقعیت آستانه در زیر دریچه کشویی به ­ترتیب به­ میزان 00/01، 33/01، 02/01، 5/3 درصد افزایش یافت. مقادیر ذکر شده در حالت مماس بر بالادست به ­ترتیب به 2/05، 77/01، 32/02 و 00/2 درصد افزایش یافت. همچنین نتایج نشان داد که ضریب دبی جریان علاوه بر محل قرارگیری آستانه، از هندسه آستانه نیز تأثیر می­ پذیرد. به این­ صورت که در موقعیت آستانه در زیر دریچه کشویی، حداکثر ضریب دبی به آستانه با هندسه نیم ­استوانه ­ای و در حالت ­های مماس بر پایین ­دست و بالادست دریچه کشویی، به آستانه هرمی اختصاص یافت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation Effect of Changing the Sill Geometries and Positions on Discharge Coefficient of Vertical Sluice Gate

نویسندگان [English]

  • Rasoul Daneshfaraz
  • Reza Norouzi
  • Parisa Ebadzadeh
Faculty of Engineering, University of Maragheh, Maragheh, Iran
چکیده [English]

In controlling water resources, sluice gates have received attention from researchers due to the ease of installation and simplicity of the operation and the governing equations. The experimental study of (Henry, 1950) is one of the first research publications in this field that estimated the flow discharge coefficient for the sluice gate with a diagram. The studies of (Alhamid, 1999), Rajaratnam and Subramanian (1967), Ferro (2000), Daneshfaraz et al. (2016) and Heidari et al. (2020) are other studies in the field of hydraulics of sluice gate, that explains the importance of research in this field. In the present paper, results of experimental investigations on the effect of applying sill on discharge coefficient in different positions of the sluice gate are presented. The effect of sills including semi-cylindrical, cylindrical, pyramidal and rectangular cube in different widths was investigated.

کلیدواژه‌ها [English]

  • Discharge coefficient
  • Flow velocity
  • Sill
  • Sluice gate
  • Streamlines
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