Effects of Intake Geometry on the Occurrence of a Free-Surface Vortex
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 4
Abstract
Both the profile and orientation of an intake entrance basically determine the characteristics of the flow (especially the velocity distribution and therefore the hydraulically developed subsurface depressions) toward the intake. The profile and orientation of the intake affect (1) the process of accumulation and growth of vorticity (circulation) along the pathway axis of the swirling vortex from the free surface to the intake; (2) position of the pathway of the swirling-vortex filament; and (3) location of the point of entry of the free-surface or subsurface vortex at the entrance of the intake. Test results indicate that the intake-entrance profile has limited effects on the occurrence of the air-core vortex and critical submergence. Regardless of the profile of the intake entrance, one common physical mechanism exists for development of free vortices occurring at intake entrances of different profiles. It is proven that spherical sink surface sectors (SSSSs) are essential for the vortex to exist.
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References
Anwar, H. O., Weller, J. A., and Amphlett, M. B. (1978). “Similarity of free vortex at horizontal intake.” J. Hydraul. Res., 16(2), 95–105.
Daggett, L. L., and Keulegan, G. H. (1974). “Similitude in free surface vortex formations.” J. Hydraul. Div., 100(HY11), 1565–1581.
Denny, D. F. (1956). “An experimental study of air-entraining vortices in pump sumps.” Proc. Inst. Mech. Eng., 170(2), 106–116.
Eroğlu, N., and Bahadırlı, T. (2007). “Prediction of critical submergence for a rectangular intake.” J. Energy Eng., 91–103.
Gulliver, S. J., and Rindels, A. J. (1987). “Weak vortices at vertical intakes.” J. Hydraul. Eng., 1101–1116.
Jain, A. K., Ranga Raju, K. G., and Garde, R. J. (1978). “Vortex formation at vertical pipe intake.” J. Hydraul. Div., 104(HY10), 1429–1448.
Kocabaş, F., and Yıldırım, N. (2002). “Effect of circulation on critical submergence of an intake pipe.” J. Hydraul. Res., 40(6), 741–752.
Naderi, V., Farsadizadeh, D., Dalir, A. H., and Arvanaghi, H. (2014). “Effect of using vertical plates on vertical intake on discharge coefficient.” Arab. J. Sci. Eng., 39(12), 8627–8633.
Padmanabhan, M., and Hecker, G. E. (1984). “Scale effects in pump sump models.” J. Hydraul. Eng., 1540–1556.
Sarkardeh, H., Zarrati, A. R., and Roshan, R. (2010). “Effect of the intake head wall and trash rack on vortices.” J. Hydraul. Res., 48(1), 108–112.
Suerich-Gulick, F., Gaskin, S., Villeneuve, M., and Parkinson, E. (2014). “Free surface intake vortices: Theoretical model and measurements.” J. Hydraul. Res., 52(4), 502–512.
Sun, H., and Liu, Y. (2015). “Theoretical and experimental study on the vortex at hydraulic intakes.” J. Hydraul. Res., 53(6), 787–796.
Taştan, K. (2016). “Critical submergence for isolated and dual rectangular intakes.” Sadhana-Acad. P. Eng. S., 41(4), 425–433.
Taştan, K. (2017). “Scale and flow boundary effects for air-entraining vortices.” Proc. Inst. Civ. Eng. Water Manage., 170(4), 198–206.
Taştan, K., and Yıldırım, N. (2010). “Effects of dimensionless parameters on air-entraining vortices.” J. Hydraul. Res., 48(1), 57–64.
Taştan, K., and Yıldırım, N. (2014). “Effects of Froude, Reynolds and Weber numbers on an air-entraining vortex.” J. Hydraul. Res., 52(3), 421–425.
Vatistas, G. H., Kozel, V., and Mih, W. C. (1991). “A simpler model for concentrated vortices.” Exp. Fluids, 11(1), 73–76.
Yang, J., Liu, T., Bottacin-Busolin, A., and Lin, C. (2014). “Effects of intake-entrance profiles on free-surface vortices.” J. Hydraul. Res., 52(4), 523–531.
Yıldırım, N. (2004). “Critical submergence for a rectangular intake.” J. Eng. Mech., 1195–1210.
Yıldırım, N., Akay, H., and Taştan, K. (2011). “Critical submergence for multiple pipe intakes by the potential flow solution.” J. Hydraul. Res., 49(1), 117–121.
Yıldırım, N., Eroğlu, N., and Taştan, K. (2012). “Occurrence of vortices at an intake of point sink character.” Teknik Dergi, 23, 5799–5812 (in Turkish).
Yıldırım, N., and Kocabaş, F. (1995). “Critical submergence for intakes in open channel flow.” J. Hydraul. Eng., 900–905.
Yıldırım, N., Kocabaş, F., and Gülcan, S. C. (2000). “Flow boundary effects of critical submergence of intake pipe.” J. Hydraul. Eng., 288–297.
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©2018 American Society of Civil Engineers.
History
Received: Nov 1, 2016
Accepted: Oct 11, 2017
Published online: Jan 31, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 30, 2018
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