نوع مقاله: مقاله پژوهشی
نویسندگان
1 دانشیار گروه عمران، دانشکده فنی و مهندسی، دانشگاه مراغه
2 استادیار گروه عمران، دانشکده فنی و مهندسی، دانشگاه مراغه
3 کارشناسی ارشد عمران-آب، باشگاه پژوهشگران جوان و نخبگان، واحد مراغه، دانشگاه آزاد اسلامی، مراغه، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The energy dissipation through hydraulic structure is an important issue in hydraulic engineering. The performance of hydraulic structure as a view of energy dissipation can provides the stabality of structure and river bed. In this study the experimental investigation of screen performance is evaluated as the energy dissipator of supercritical flow. The investigated parameters include: Froude number; screen porosity; location of screens. The Froude number of supercritical flow has been varied in the range of 2.5 to 8.5, and the screen porosities are 40 and 50%. Also the location of screens has been considered 62.5, 125 and 250 cm after supercritical flow generator gate. The results indicate that screen porosity, location of screens from supercritical flow generator gate and also Froude number of supercritical flow have a significant effect on screen performance. The energy dissipation of system through screens is more than free hydraulic jump in the entire evaluated cases. The results show that the Froude number increasing result in screen performance (relative energy dissipation) increasing, but screen efficiency (difference between the relative energy dissipation of system from free hydraulic jump) decreasing. Also the screen with 50 porosity which has been located at 125 cm from gate has the best performance.
کلیدواژه‌ها [English]
Aslankara, V. 2007. Experimental investigation of tail water effect on the energy dissipation through Screens. M. Sc. Thesis. Department of Civil Engineering Middle Technical University. Ankara. Turkey.
Baines, W. D. and Peterson, E. G. 1951. An investigation of flow through screens. T-ASME. 73(5):
466-481.
Balkis, G. 2004. Experimental investigation of energy dissipation through inclined screens. M. Sc. Thesis. Department of Civil Engineering. Middle Technical University. Ankara. Turkey.
Belaud, G., Cassan, L. and Baume, J. P. 2009. Calculation of contraction coefficient under sluice gates and application to discharge measurement. J. Hydraul. Eng-ASCE. 135, 1086-1091.
Bozkus, Z. and Aslankara, V. 2008. Tail water effect on the energy dissipation through screens. Proceedings of the 8th International Congress on Advances in Civil Engineering. Eastern Mediterranean University. Famagusta. North Cyprus: ACE.
Bozkus, Z., Balkis, G. and Ger, M. 2005. Effect of inclination of screens on energy dissipation downstream of small hydraulic structures. Proceedings of the 17th Canadian Hydrotechnical Conference. Edmonton. Alberta. Canada.
Bozkus, Z., Cakir, P. and Ger, M. 2007. Energy dissipation by vertically placed screens. Can. J. Civil Eng. 34(4): 556-565.
Cakir, P. 2003. Experimental investigation of energy dissipation through screens. M. Sc. Thesis. Department of Civil Engineering. Middle East Technical University. Ankara. Turkey.
Chow, V. T. 1959. Open Channel Hydraulics. 3rd Ed. McGraw-Hill. New York.
Gungor, E. 2005. Experimental investigation of energy dissipation through triangular screens. M. Sc. Thesis. Department of Civil Engineering. Middle East Technical University. Ankara. Turkey.
Koo, J. K. and James, D. F. 1973. Fluid flow around and through a screen. J. Fluid Mech. 60(3): 513-538.
Laws, E. M. and Livesey, J. L. 1978. Flow through screens. Annu. Rev. Fluid Mech. 10, 245-267.
Rajaratnam, N. and Hurtig, K. I. 2000. Screen-type energy dissipater for hydraulic structures. J. Hydraul. Eng-ASCE. 126(4): 310-312.
Sadeghfam, S., Akhtari, A. A., Daneshfaraz, R. and Tayfur, G. 2014. Experimental investigation of screens as energy dissipaters in submerged hydraulic jump. Turk. J. Eng. Environ. Sci. 38, 126-138.
Yeh, H. H. and Shrestha, M. 1989. Free-surface flow through screen. J. Hydraul. Eng-ASCE. 115(10):
1370-1385.
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