Vortex-Induced Air Entrainment Rates at Intakes
Publication: Journal of Hydraulic Engineering
Volume 141, Issue 11
Abstract
This paper presents an intrinsic approach to estimate air entrainment rates due to intake vortices based on large-scale laboratory measurements. Quasi-continuous measurements of the amount of entrained air were conducted using a sophisticated de-aeration system. The data analysis of 34 experimental runs resulted in a parameter fit describing the air entrainment rates at horizontal intakes. Additionally, a prediction band is given that provides a handle to inspect probability aspects. Furthermore, an approach to determine the critical intake submergence is presented. These guidelines enable hydraulic design engineers to estimate both the amount of entrained air and the critical intake submergence at horizontal intakes, so that the efficiency and safety of pressurized waterway systems is further increased.
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Acknowledgments
The authors would like to thank swisselectric research and the Swiss Federal Office of Energy (SFOE) for their financial support.
References
Chang, E. (1977). “Review of literature on the formation and modelling of vortices in rectangular pump sumps.”, British Hydromechanics Research Association (BHRA), Cranfield, UK.
Chang, K. S., and Lee, D. J. (1995). “An experimental investigation of the air entrainment in the shutdown cooling system during mid-loop operation.” Ann. Nucl. Energy, 22(9), 611–619.
Daggett, L. L., and Keulegan, G. H. (1974). “Similitude in free-surface vortex formations.” J. Hydraul. Div., 100(HY11), 1565–1581.
Denny, D. F., and Young, G. A. J. (1957). “The prevention of vortices and swirl at intakes.” Proc., 7th IAHR Congress, Lisbon, Portugal.
Gordon, J. L. (1970). “Vortices at intakes.” Water Power, 22(4), 137–138.
Haindl, K. (1959). “Contribution to air entrainment by a vortex.” Proc., 8th IAHR Congress, Montreal, Canada.
Hattersley, R. T. (1965). “Hydraulic design of pump intakes.” J. Hydraul. Div., 91(HY2), 223–249.
Hecker, G. E. (1987). “Fundamentals of vortex intake flow, swirling flow problems at intakes.” IAHR hydraulic structures design manual, Vol. 1, Balkema, Rotterdam, Netherlands, 13–38.
Iversen, H. W. (1953). “Studies of submergence requirements of high-specific-speed pumps.” Trans. ASME, 75(4), 635–641.
Jain, A. K., Ranga Raju, K. G., and Garde, R. J. (1978). “Vortex formation at vertical pipe intakes.” J. Hydraul. Div., 104(HY10), 1429–1445.
Keller, J., Möller, G., and Boes, R. M. (2014). “PIV measurements of air-core intake vortices.” Flow Meas. Instrum., 40, 74–81.
Knauss, J. (1987). “Prediction of critical submergence, swirling flow problems at intakes.” IAHR hydraulic structures design manual, Vol. 1, Balkema, Rotterdam, Netherlands, 57–76.
Kobus, H. (1984). “Local air entrainment and detrainment.” Technische Akademie Esslingen Symp. on Scale Effects in Modelling Hydraulic Structures, H. Kobus, ed., International Association for Hydraulic Research.
Möller, G. (2013). “Vortex-induced air entrainment rate at intakes.” Mitteilung, R. M. Boes, ed., Vol. 220, VAW, ETH Zurich, Switzerland.
Möller, G., Detert, M., and Boes, R. M. (2012). “Air entrainment due to vortices: State-of-the-art.” Proc., 2nd IAHR Europe Congress, P. Rutschmann, M. Grünzner, and S. Hötzl, eds., Munich, Germany.
Padmanabhan, M. (1984). “Air ingestion due to free-surface vortices.” J. Hydraul. Eng., 1855–1859.
Papillon, B., Kirejczyk, J., and Sabourin, M. (2000). “Atmospheric air admission in hydroturbines.” Proc., HydroVision.
Pfister, M., and Chanson, H. (2014). “Two-phase air-water flows: Scale effects in physical modeling.” J. Hydrodyn., 26(2), 291–298.
Poullikkas, A. (2000). “Effects of entrained air on the performance of nuclear reactor cooling pumps.” Proc., Melecon 2000: Information Technology and Electrotechnology for the Mediterranean Countries, 1028–1031.
Ranga Raju, K. G., and Garde, R. J. (1987). “Modelling of vortices and swirling flows.” Swirling flow problems at intakes, IAHR hydraulic structures design manual, J. Knauss, ed., Vol. 1, Balkema, Rotterdam, Netherlands, 77–90.
Stahel, W. A. (2008). Statistical data analysis, Vieweg, Wiesbaden, Germany (in German).
Suerich-Gulick, F., Gaskin, S., Villeneuve, M., and Parkinson, É. (2014a). “Characteristics of free surface vortices at low-head hydropower intakes.” J. Hydraul. Eng., 291–299.
Suerich-Gulick, F., Gaskin, S., Villeneuve, M., and Parkinson, É. (2014b). “Free surface intake vortices: Scale effects due to surface tension and viscosity.” J. Hydraul. Res., 52(4), 513–522.
Suerich-Gulick, F., Gaskin, S., Villeneuve, M., and Parkinson, É. (2014c). “Free surface intake vortices: Theoretical model and measurements.” J. Hydraul. Res., 52(4), 502–512.
Tastan, K., and Yildirim, N. (2014). “Effects of Froude, Reynolds, and Weber numbers on an air-entraining vortex.” J. Hydraul. Res., 52(3), 421–425.
Wickenhäuser, M. (2008). “Zweiphasenströmung in Entlüftungssystemen von Druckstollen (‘Two-phase flow in de-aeration systems of pressurized tunnels’).” Mitteilung, H.-E. Minor, ed., Vol. 205, VAW, ETH Zurich, Switzerland (in German).
Zhou, F., Hicks, F. E., and Steffler, P. M. (2002). “Transient flow in a rapidly filling horizontal pipe containing trapped air.” J. Hydraul. Eng., 625–634.
Zhou, L., Liu, D., and Karney, B. (2013a). “Investigation on hydraulic transients of two entrapped air pockets in a water pipeline.” J. Hydraul. Eng., 949–959.
Zhou, L., Liu, D., Karney, B., and Wang, P. (2013b). “Phenomenon of white mist in water rapidly filling pipeline with entrapped air pocket.” J. Hydraul. Eng., 1041–1051.
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Published In
Journal of Hydraulic Engineering
Volume 141 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 23, 2014
Accepted: Mar 12, 2015
Published online: Jun 8, 2015
Published in print: Nov 1, 2015
Discussion open until: Nov 8, 2015
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