Experimental Study of Vortex Flow Phenomena in Orifice Spillways (Case study: Karun III Dam)

Document Type : Original Article

Authors

1 Assistant professor, Department of Water Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

2 Senior Researcher in Hydraulic structures unit, Water Research Institute of Ministry of Energy, Tehran, Iran

3 M.Sc. in Water structures, Chamran University of Ahvaz, Ahvaz, Iran.

Abstract

Formation of Vortices is one of the serious problems in dam operation. In the present work, to study the vortex and its effects on orifice spillways of Karun III dam in southwestern Iran, partial (with only one orifice) physical models were constructed. Regarding to the special conditions in orifice spillways (changing discharge by changing the reservoir elevation) this study showed that when a decrease in reservoir elevation occurs, first strong vortices take place  and after reaching a maximum value the strength of these vortices decreases. This research also showed that, by increase in vortex strength, the discharge coefficient may reduce down to 10 percent. Measuring the critical submerged depth showed that among theoretical methods, Gordon and Knauss have better results.

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References

Andaroodi, M. (2006) “Standardization of civil engineering works of small high-head hydropower plants and development of an optimization tool”, Laboratoire de Constructions Hydrauliques Ecole Polytechnique Fédérale de Lausanne, Communication 26, 300 pages
Daemi, A. (1998), “Study on effective parameters on vortex formation at horizontal intake”, Proceeding of Water resources engineering Conference, Vol 2. pp.1900- 1906
Gordon, J.L. (1970), ”Vortices at Inkaes”, International Water Power & Dam Construction, No 4, pp137-138
Hecker, G.E. (1981),”Model-Prototype Comparison of  Free Surface Vortices”, Journal of Hydraulic Engineering, Vol.107, No.10, pp. 1243-1259
Knauss, J. (1987) “Swirling Flow Problems at intakes”, IAHR Hydraulic structure Manual No 1, A.A. Balkema, Rotterdam, The Netherlands
Reddy, Y.R. and Pickford, J.A. (1972), ”Vortices at Intake in Conventional Sumps”, International Water Power & Dam Construction, Vol 24, No 3, pp. 108-109
 
 
 
 
 
 
 
Iran-Water Resources Research
Volume 6, Issue 2
July 2010
Pages 83-85

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History

  • Receive Date: 14 September 2008
  • Accept Date: 01 May 2010

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