Evaluation of Critical Sink Surface in Vertical Intake Branched out from Reservoir

Document Type : Research Paper

Authors

1 M.Sc Graduate, Civil Engineering Department, Jundi-Shapur University of Technology, Dezful, Iran.

2 Associate Professor, Civil Engineering Department, Jundi-Shapur University of Technology, Dezful, Iran

3 Instructor, Civil Engineering Department, Jundi-Shapur University of Technology, Dezful, Iran.

4 Assistant Professor, Civil Engineering Department, Jundi-Shapur University of Technology, Dezful, Iran.

Abstract

Intakes are the most significant hydraulic structures, which are also used as inlet structures in outlets to supply water for hydro-electric power, irrigation, and drinking. A major problem for vertical circular spillways is that vortexes are formed on their inlet with several negative effects: reducing discharge coefficient, excessive head formation on spillway inlet, structure vibration, increasing of cavitation formation probability, suction of floating bodies into conduit, excessive oscillations on flow surface, unsteady flow formation, and increasing energy losses are the major consequences. Vortex flows result from flow direction variation, viscosity and surface tension. The flow type causes negative effects in operation of structures such as vertical circular spillway (Kabiri Samani and Borghei, 2001).
Taştan and Yildirim (2010) indicated that critical submerged depth for intake in canal with uniform flow equals radius of spherical sink surface, which was finally named critical spherical sink surface. Rankine (1858) represented a model of vortex, namely Rankine compound vortex. In this model, it is assumed fluid particles, which are in the vicinity of vortex center, are solid bodies with high viscosity and rotational motion around their axes (Forced Vortex). The area is located inside nonviscous zone at a distance from vortex center. This research investigates geometric and hydraulic properties of critical sink surface by simulating flow in the environs of vertical intake inlet.

Keywords

Main Subjects

References

1-    Ahadiyan, J. and Nouroozi, S.,2017. Effect of Vortex Breaker Blades 45 Degree on Discharge Coefficient of Morning Glory Spillway Using Flow-3D. Journal of Irrigation Science and Engineering, 40(1), pp.191-200. (in persian).
 
2-    Asadsangabi, F., Talebbeydokhti, N. and Rahnavard, M., 2014. Two phase flow modeling in shaft-spillways using volume of fluid (VOF) method. Iranian Journal of Science and Technology. Transactions of Civil Engineering, 38(C1), pp.99-109.
 
3-    Einstein, H. A.,and Li, H., 1955. Steady vortex flow in real fluid. La Houille Blanche, 10(4), pp. 483-496.
 
4-    Jain, A.K., Garde, R.J. and Ranga Raju, K.G., 1978. Vortex formation at vertical pipe intakes. Journal of the Hydraulics Division, 104(10), pp.1429-1445.
 
5-    Knauss, J. ed., 2017. Swirling flow problems at intakes. Routledge.
 
6-    Lashkar-Ara, B. and Sheikhi, Y. 2017. Introduce of crown wheel spillway and study of its discharge coefficient under free flow regime. Journal of Irrigation Science and Engineering, 40(2), pp.209-221 (in Persian).
 
7-    Padmanabhan, M. and Hecker, G.E., 1984. Scale effects in pump sump models. Journal of Hydraulic Engineering, 110(11), pp.1540-1556.
 
8-    Rankine, W.J.M., 1872. A manual of applied mechanics. Charles Griffin and Company.
 
9-    Roache, P.J., 1994. Perspective: a method for uniform reporting of grid refinement studies. Transactions-American Society of Mechanical Engineers. Journal of Fluids Engineering, 116, pp.405-41.
 
10- Shemshi, R. and Kabiri-Samani, A., 2017. Swirling flow at vertical shaft spillways with circular piano-key inlets. Journal of Hydraulic Research, 55(2), pp.248-258.
 
11-   Tastan, k., Yildirim, N., 2010. Effect of dimensionless parameters on air-entraining vortices. Journal of Hydraulic Research, 48(1), pp.57-64.
 
12-   Wang, Y., Jiang, C. and Liang, D., 2011. Study on the critical submergence of surface vortices and the design of anti-vortex intakes. Science China Technological Sciences, 54(4), pp.799-804.
 
13-   Yang, J., Liu, T., Bottacin-Busolin, A. and Lin, C., 2014. Effects of intake-entrance profiles on free-surface vortices. Journal of Hydraulic Research, 52(4), pp.523-531.
 
14-   Yildirim, N. and Kocabaş, F., 1995. Critical submergence for intakes in open channel flow. Journal of Hydraulic Engineering, 121(12), pp.900-905.
 
15-   Yildirim, N. and Kocabaş, F., 1998. Critical submergence for intakes in still-water reservoir. Journal of Hydraulic Engineering, 124(1), pp.103-104.
 
16-   Zomorodian, S.M.A. and Sabzevari, M.B., 2006. Effect of Velocity and Flow Direction at Approach Channel Outlet on the Discharge Coefficient of Vertical Pipe Intake. Journal of Science and Technology of Agriculture and Natural Resources, 9(4), pp. 1-16. (in persian).
Irrigation Sciences and Engineering
Volume 43, Issue 1
March 2020
Pages 73-88

Files

History

  • Receive Date: 02 January 2018
  • Revise Date: 12 February 2018
  • Accept Date: 14 February 2018
  • Publish Date: 20 March 2020

Share

How to cite

Statistics