مقایسه استهلاک انرژی در صفحات مشبک افقی دوگانه و حوضچه‌های آرامش در پایین‌دست شیب‌شکن قائم

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

3 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران

چکیده

هدف از تحقیق حاضر بررسی استهلاک انرژی صفحات مشبک دوگانه افقی نصب شده بر لبه شیب‌شکن قائم بوده و نتایج آن با نتایج حوضچه‌های آرامش استاندارد نوع یک، دو، سه و چهار مورد مقایسه قرار گرفت. تعداد 140 آزمایش مختلف بر روی صفحات مشبک دوگانه افقی نصب شده بر لبه شیب‌شکن قائم در فواصل نسبی بین صفحات 25/0، 33/0 و 5/0، تخلخل 40 و 50 درصدی صفحات و دو ارتفاع شیب‌شکن 20 و 25 سانتی­متری انجام شد. نتایج نشان داد که فاصله نسبی و تخلخل صفحات مشبک افقی دوگانه تاثیر چندانی بر انرژی باقی­مانده نسبی نرمال جریان و عمق نسبی پایین‌دست نداشته ولی با این حال با افزایش فاصله نسبی و درصد تخلخل صفحات، طول حوضچه آرامش شیب‌شکن کاهش می‌یابد. در مقایسه با حوضچه‌های آرامش نیز، به­کارگیری صفحات مشبک افقی دوگانه سبب کاهش طول حوضچه آرامش شیب‌شکن شده و انرژی نسبی باقی‌مانده و عمق نسبی پایین‌دست به­ترتیب بیش از 35 و 49 درصد کاهش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of Energy Dissipation by Double Horizontal Screen and Stilling Basins at Vertical Drop Downstream

نویسندگان [English]

  • Rasoul Daneshfaraz 1
  • Mahdi Majedi Asl 2
  • Shaban Razmi 3
1 Professor , Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran.
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran.
3 Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran.
چکیده [English]

The aim of this study was to evaluate and compare the double horizontal screens with four types of stilling basin (I, II, III and IV) at vertical drop downstream in terms of energy dissipation. A total of 140 different experiments were performed on a vertical drop equipped with double horizontal screens (with 40 and 50% porosity) at relative spaces of 0.25, 0.33 and 0.5 between the screens, and two drop height of 20 and 25 cm. The results showed that the relative spacing and porosity of the double horizontal screen do not have a significant effect on the residual energy and the relative depth of downstream, however, the length of drop stilling basin is decreased with increasing the relative spacing and porosity of screen. In compared to the stilling basins, the use of double horizontal screens reduced the length of drop stilling basin and the residual energy and relative depth of downstream is reduced by more than 35 and 49%, respectively.

کلیدواژه‌ها [English]

  • normalized residual energy
  • double horizontal screens
  • stilling basin
  • vertical drop
  • drop length

مراجع

Aslankara, V. (2007). Experimental investigation of tailwater effect on the energy dissipation through screens (Doctoral dissertation, MS thesis, Middle East Technical Univ. Ankara, Turkey).
Balkış, G. (2004). Experimental Investigation of Energy Dissipation through Inclined Screens. (Doctoral dissertation, Middle East Technical Univ, Ankara, Turkey).
Bozkus, Z., Çakir, P., & Ger, A. M. (2007). Energy dissipation by vertically placed screens. Canadian Journal of Civil Engineering, 34(4), 557-564.
Çakir, P. (2003). Experimental investigation of energy dissipation through screens (Doctoral dissertation, M. Sc. thesis, Department of Civil Engineering, Middle East Technical University, Ankara, Turkey).
Daneshfaraz, R., Sadeghfam, S., & Ghahramanzadeh, A. (2017a). Three-dimensional numerical investigation of flow through screens as energy dissipators. Canadian Journal of Civil Engineering, 44(10), 850-859.
Daneshfaraz, R., Sadeghfam, S. and Tahni, A., (2019a). Experimental investigation of screen as energy dissipators in the movable-bed channel. Iranian Journal of Science and Technology, Transactions of Civil Engineering, pp.1-10, https://doi.org/10.1007/s40996-019-00306-7.
Daneshfaraz, R., Sadeghfam, S., Hasanniya, V. (2019b). Experimental Investigation of Energy Dissipation in Vertical Drops Equipped with a Horizontal Screen under Supercritical Flow. Iranian Journal of Soil and Water Research, 50(6), 1421-1436 (In Persian).
Daneshfaraz, R., Chabokpour, J., Nezafat, H. (2019c). 'Experimental Investigation of the Scouring due to Hydraulic Jump in Screens', Iranian Journal of Soil and Water Research, 50(5), pp. 1039-1051. (In Persian).
Daneshfaraz, R., Hasanniya, V., Mirzaei, R., Bazyar, A. (2020d). Experimental investigating effect of positive slope of the horizontal screen on hydraulic characteristics of vertical drop. Iranian Journal of Soil and Water Research, 50(10), pp. 2499-2509. (In Persian).
Daneshfaraz, R., Sadeghfam, S., Rezazadeh Joudi, A. (2017b). Experimental investigation on the effect of screen’s location on the flow's energy dissipation. Irrigation and Drainage Structures Engineering Research, 17(67), 47-62 (In Persian).
Daneshfaraz, R., Majedi Asl, M., Razmi, S., Norouzi, R. & Abraham, J. (2020a). Experimental investigation of the effect of dual horizontal screens on the hydraulic performance of a vertical drop. Int. J. Environ. Sci. Technol. 17, 2927–2936 (2020a). https://doi.org/10.1007/s13762-019-02622-x
Daneshfaraz, R., Asl, M.M., Bazyar, A., Abraham, J. and Norouzi, R. (2020b). The laboratory study of energy dissipation in inclined drops equipped with a screen. Journal of Applied Water Engineering and Research, DOI: 10.1080/23249676.2020.1799877
Daneshfaraz, R., Sadeghfam, S., Minaei, O. (2020c). Experimental Study of Energy Dissipation in the Stilling Basin with Movable Bed in the Upstream of Screens, Iranian Journal of Soil and Water Research, 50(9), pp. 2113-2123. doi: 10.22059/ijswr.2019.277537.668145(In Persian).
Esen, I. I., Alhumoud, J. M., & Hannan, K. A. (2004). Energy Loss at a Drop Structure with a Step at the Base. Water international, 29(4), 523-529.
Gill, M.A. (1979). Hydraulics of rectangular vertical drop structures. Journal of Hydraulic Research, 17(4), 289-302.
Hasanniya, V. (2019). Experimental investigation of flow energy dissipation through the screens application in drops. Master's thesis, Civil Engineering Department, Faculty of Engineering, University of Maragheh, Maragheh, Iran, (In Persian).
Hong, Y. M., Huang, H. S., & Wan, S. (2010). Drop characteristics of free-falling nappe for aerated straight-drop spillway. Journal of Hydraulic Research, 48(1), 125-129.
Mahmoud, M.I., Ahmed, S.S.  And Al-Fahal, A.S.A. (2013). Effect of different shapes of holes on energy dissipation through perpendicular screen. Journal of Environmental Studies, 12, 29-37.
Nayebzadeh, B., Lotfollahi-yaghin, M.A. and Daneshfaraz, R., (2019). Experimental study of energy dissipation at a vertical drop equipped with vertical screen with gradually expanding at the downstream. AUT Journal of Civil Engineering.
Peterka, A. J. (1978). Hydraulic design of stilling basins and energy dissipators (No. 25). Department of the Interior, Bureau of Reclamation.
Rajaratnam, N., & Chamani, M. R. (1995). Energy loss at drops. Journal of Hydraulic Research, 33(3), 373-384.
Rajaratnam, N., & Hurtig, K. I. (2000). Screen-type energy dissipator for hydraulic structures. Journal of Hydraulic Engineering, 126(4), 310-312.
Rand, W. (1955). Flow geometry at straight drop spillways. In Proceedings of the American Society of Civil Engineers, 81(9), 1-13.
Sadeghfam, S., Akhtari, A. A., Daneshfaraz, R., & Tayfur, G. (2015). Experimental investigation of screens as energy dissipaters in submerged hydraulic jump. Turkish Journal of Engineering and Environmental Sciences, 38(2), 126-138.
Sadeghfam, S., Daneshfaraz, R., Khatibi, R. and Minaei, O., 2019. Experimental studies on scour of supercritical flow jets in upstream of screens and modelling scouring dimensions using artificial intelligence to combine multiple models (AIMM). Journal of Hydroinformatics, 21(5), pp.893-907.
Sharif, M., & Kabiri-Samani, A. (2018). Flow regimes at grid drop-type dissipators caused by changes in tail-water depth. Journal of Hydraulic Research, 1-12.
تحقیقات آب و خاک ایران
دوره 51، شماره 7
مهر 1399
صفحه 1681-1690

فایل ها

هم رسانی

ارجاع به این مقاله

آمار