مطالعه عددی تأثیر تبدیل تدریجی سهموی در بالادست دریچه سالونی بیضوی بر شرایط هیدرولیکی جریان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد گروه سازه های آبی دانشکده مهندسی آب و محیط زیست دانشگاه شهید چمران اهواز، اهواز، ایران.

2 کارشناس ارشد سازه های آبی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران.

3 استادیار گروه سازه های آبی دانشکده مهندسی آب و محیط زیست دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

سرریز­ها و دریچه ­ها از جمله سازه ­های موثر در شبکه­ های آبرسانی روباز می ­باشند. دریچه­ های سالونی بیضوی نوع خاصی از دریچه­ ها می­باشند که اخیرا مورد توجه محققین قرار گرفت. حضور تبدیل تدریجی در بالادست دریچه­ های سالونی بیضوی می­ تواند نقش موثری در افزایش کارایی دریچه­ ها اعمال نماید. در این تحقیق اثر تبدیل تدریجی سهموی در بالادست دریچه سالونی بیضوی روی پارامترهای هیدرولیکی (ضریب دبی و افت انرژی) مورد مطالعه نرم ­افزاری قرار گرفت. بنابراین سناریوهای مورد نظر توسط نرم افزار Flow3D شبیه ­سازی شد. نتایج نشان داد پس از قرارگیری تبدیل تدریجی سهموی در بالادست دریچه سالونی بیضوی، بردارهای جریان با انحنا و شکستگی کمتری وارد دریچه می ­شوند و تعداد و اندازه گردابه­ های بوجود آمده در پایین ­دست دریچه نیز کاهش می ­یابند. لذا  با افزایش کشیدگی تبدیل تدریجی سهموی به سمت بالادست دریچه و افزایش پارامتر Rr ، ضریب دبی دریچه افزایش و میزان افت انرژی نسبی جریان عبوری از دریچه کاهش می­ یابد. پس از بررسی کمی و محاسبه درصد افزایش ضریب دبی و کاهش افت انرژی، حداکثر افزایش ضریب دبی به میزان 24 درصد و حداکثر کاهش افت انرژی نسبی به میزان 7/27 درصد مشاهده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Study of the Effect of Gradual Parabolic Inlet Transition of the Elliptical LOPAC Gate on the Hydraulic Conditions of the Flow

نویسندگان [English]

  • Mahmood Shafai-Bajestan 1
  • Keyvan Kazemi Hasanvand 2
  • Mehdi Zeinivand 3
1 ‌Professor, Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2 ‌Master of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
3 Assistant Professor, Department of Water Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
چکیده [English]

Flow control and regulation of water levels in irrigation canals are critical to improving the distribution network's performance, water transfer, and ease of operation of the intakes. Therefore, the network needs to improve the existing control and regulation structures and construct the new structures (Monem and Hosseinzadeh, 2012). Today, various spillways and gates have been used as control and regulation structures in water transmission networks. Elliptical LOPAC gates are a particular type of gate that researchers have considered in recent decades due to their convenient advantages (Pilbala et al., 2021). Studies have been limited so far, so in this study, the hydraulic performance of this type of gate with the presence of gradual inlet transition has been investigated both experimentally and numerically. Research on Lopac gates indicates that studies have been performed on hydraulics, mainly in a sudden contraction or full-width gates in the laboratory flume. However, in many cases, the width of the gate needs to be less than the width of the channel, and an inlet transition is necessary to reduce the energy loss. Therefore, a parabolic transition was used in this study, and in particular, the effect of the parabolic transition upstream of the elliptical Lopac gate on the hydraulic conditions was investigated using Flow-3D software.

کلیدواژه‌ها [English]

  • Elliptical Lopac Gate
  • Gradual Parabolic Transition
  • Flow Coefficient
  • Relative Energy Loss
  • Flow3D

مراجع

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علوم و مهندسی آبیاری
دوره 47، شماره 3
آبان 1403
صفحه 1-17

فایل ها

سابقه مقاله

  • تاریخ دریافت: 08 مهر 1400
  • تاریخ بازنگری: 16 اردیبهشت 1401
  • تاریخ پذیرش: 18 اردیبهشت 1401
  • تاریخ انتشار: 01 آبان 1403

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