بررسی آزمایشگاهی مشخصات پرش هیدرولیکی در حوضچه‌های واگرا-همگرا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری آب و سازه‌های هیدرولیکی دانشگاه آزاد اسلامی واحد استهبان.

2 استادیار گروه آب واحد استهبان، دانشگاه آزاد اسلامی واحد استهبان

3 دانشیار، دانشگاه صنعتی اصفهان.

چکیده

در این تحقیق مشخصات پرش هیدرولیکی در حوضچه‌های واگرا-همگرا مورد بررسی قرار گرفته و کلیه آزمایش­ها در کانالی به طول 11 متر، عمق 7/0 متر  و عرض 48/0 متر انجام گرفت. نتایج به‌دست آمده از حوضچه واگرا-همگرا با حوضچه واگرای تدریجی و کلاسیک و همچنین تحقیقات پیشین مقایسه شده است. نتایج نشان می‌دهد که در دبی بیشترین  نسبت عمق (y2/y1) و طول پرش (Lj/y1) در حوضچه واگرا-همگرا به‌ترتیب به میزان 5/35 و 7/95 درصد نسبت به حوضچه‌های کلاسیک کاهش داشته در حالی‌که این مقادیر برای حوضچه واگرای تدریجی به‌ترتیب  برابر با 7/31 و 9/69 درصد به‌دست آمده است. از طرفی مقدار افت انرژی در حوضچه‌های واگرا-همگرا و واگرای تدریجی به‌ترتیب 7/23 و 8/19 درصد نسبت به حوضچه‌های کلاسیک افزایش یافته است. در انتها با استفاده از آنالیز ابعادی و دو روش تحلیلی و رگرسیونی، معادله‌هایی برای پیش‌بینی نسبت اعماق مزدوج و طول پرش پیشنهاد شده است. با توجه به این تحقیق می‌توان نتیجه گرفت که حوضچه‌های واگرا-همگرا عملکرد مناسب­تری نسبت به حوضچه‌های کلاسیک و واگرا دارد که علاوه بر ابعاد کمتر دارای افت انرژی بیشتری نیز می‌باشند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation of hydraulic jump in Hexagonal Ez Stilling Basin

نویسندگان [English]

  • Mohammad hossein Jafari Abnavi 1
  • Reza Mohammadpour 2
  • Mohammad karim Beirami 3
1 PhD Student of Water and Hydraulic Structure, Islamic Azad University, Estahban branch.
2 Assistant Professor, Department of Civil Engineering, Islamic Azad University, Estahban branch.
3 Associate Professor, Isfahan University of Technology
چکیده [English]

Hydraulic jump is used as an important energy dissipator phenomenon downstream of hydraulic structures such as spillways, gates, and chutes. The US Bureau of Reclamation (USBR) surveyed the state of knowledge in this field and presented practical guidelines for the design of different types of stilling basins (Peterka 1958). However, it is always preferable to achieve maximum energy loss with a minimum length and cost in the stilling basin. Experimental studies on the effect of gradually diverging stilling basin walls on the hydraulic jump parameters have shown that diverging walls cause a reduction of the sequent depth by up to 30%, a reduction of the length of the hydraulic jump by up to 22%, and an increase in the energy loss compared with the classic hydraulic jump (Kouluseus and Ahmad 1969; Khalifa and McCorquodale 1979; Omid et al. 2007). Hassanpour et al. (2017) studied the characteristics of the hydraulic jump in a gradually expanding rectangular stilling basin. They showed that the sequent depth ratio and relative length of the jump decrease with decreasing divergence ratio. Arabhaabhirama and Abela (1971) studied radial hydraulic jumps in a gradually expanding rectangular channel with divergence angles from 0 to 13◦. The results showed that the divergence of the walls causes reductions in the sequent depth and length of the jump and an increase in energy loss as compared to the hydraulic jump in a straight rectangular channel.
Since the hydraulic jump changes the flow from the supercritical to the subcritical, on the other hand, the flow depth is decreased in the expanding and diverging stilling basins in the supercritical and subcritical conditions, respectively. The innovation of this research is the use of divergent-convergent stilling basins to increase the performance of the stilling basins.  The results of the divergent-convergent stilling basin were compared with the classic and divergent basins as well as previous research.

کلیدواژه‌ها [English]

  • Flow Velocity
  • Jump length
  • Alternative depth
  • Energy loss

مراجع

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علوم و مهندسی آبیاری
دوره 46، شماره 3
آذر 1402
صفحه 85-102

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سابقه مقاله

  • تاریخ دریافت: 28 اردیبهشت 1401
  • تاریخ بازنگری: 25 آبان 1401
  • تاریخ پذیرش: 29 آبان 1401
  • تاریخ انتشار: 01 آذر 1402

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