A simple Technique for Preventing Vortex With Some Aspects of Flow under Inclined Sluice Gates

Year 2018, Volume: 2 Issue: 1, 1 - 7, 05.06.2018

Moayed S. Khaleel Ahmed Y. Mohammed

Abstract

In this paper the effect of vortex formation
upstream inclined sluice gate, discharge coefficient as well as predicted
discharge equation have been studied for several gate openings (3,4&4.5)
cm, five discharges and three different gate
cases, vertical and inclined opposite flow
direction in (30 and 45)° angles.

It was found that there is no vortex at vertical
sluice gate but observed at gate inclined opposite flow direction. There are tow
corner vortices in high discharges and one central vortex in low discharges. The
reduction of these vortices has been studied by vortex decay elements.

The average discharge coefficient for
vertical gate was 0.645 while these values reduced to 0.59 and 0.564 for gate
inclined (30 and 45)° opposite flow direction respectively

Keywords

vortex, sluice gate, hydraulic, discharge coefficient, vortices decay

References

• [1] Rajaratnam N. and Subramanya K. "Flow Equation for the Sluice Gate." J. Irr. & Dra. Div., ASCE, 93(9), 167-186 (1967).
• [2] Fangmeier D.D.and Strelkoff T.S. "Solution for Gravity Flow Under a Sluice Gate." J.eng.Mech. Div., ASCE, 94(2), 153-176 (1967).
• [3] Isaacs L.T. "Numerical Solution for Flow under Sluice Gates." J.Hydra. Div., ASCE, 103(5), 473-481 (1977).
• [4] Rajaratnam N. "Free Flow Immediately Below Sluice Gates." J. Hydra. Div., ASCE, 103(4), 345-351 (1977).
• [5] Cheng A.H-D. , Liggett J.A.and Liu P.L-F. "Boundary Calculations of Sluice and Spillway Flows." J. Hydra. Div., ASCE, 107(10), 1163-1178 (1981).
• [6] Rajaratnam N. and Humphries J. A. "Free Flow Upstream of Vertical Sluice Gates." J. Hydra. Res., IAHR, 20(5), 427-437 (1982).
• [7] Nago H. "Influence of Gate Shapes on Discharge Coefficients." Proc. fJSCE, 10(2), 59-71 (1978).
• [8] Montes J.S. "Irrotational Flow and Real Fluid Effects under Planar Sluice Gates." J. Hydra. Eng., ASCE, 123(3), 219-232 (1997).
• [9] Swamee, P. K. “Sluice-gate discharge equations.” J. Irrig. Drain. Eng., 118(1), 56–60 (1992).
• [10] [10] Hager W.H. "Underflow of Standard Sluice Gate." Experiments in Fluids,27(4), 339-350 (1999).
• [11] Jung-Fu, Yen Chih-Han and Lin Chang-Tai Tsai "Hydraulic Characteristics And Discharge Control Of Sluice Gates." Jour. of the Chinese Inst. Of Eng., 24(3), 301-310 (2001).
• [12] Dwi Tjahjanto, Mohd Adib Mohd Razi, Wan Afnizan Wan Mohamed and Nur Bazilah Ishak, "Investigation of the Properties of Flow beneath a Sluice Gate.", International Conference On Civil Engineering, Kuantan, Pahang, Malaysia, 12-14th May 2008, 1-9 (2008).
• [13] Sepulveda, C., Gomez, M., and Rodellar, J. “Benchmark of discharge calibration methods for submerged sluice gates.” J. Irrig. Drain Eng., 135(5), 676–682 (2009).
• [14] Belaud, G., Cassan, L., and Baume, J.-P. "Calculation of contraction coefficient under sluice gates and application to discharge measurement.” J. Hydraul. Eng., 135(12), 1086–1091 (2009).
• [15] Lozano, D., Mateos, L., Merkley, G. P., and Clemmens, A. J. "Field calibration of submerged sluice gates in irrigation Canals.” J. Irrig. Drain. Eng., 135(6), 763–772 (2009).
• [16] Habibzadeh A, Vatankhah R and Rajaratnam N. "Role of Energy Loss on Discharge Characteristics of Sluice Gates." Jour. of Hydra. Eng., 137(9), 1079-1084 (2011).
• [17] Ahmed Y. Mohammed "Hydraulic Study for Performance of the Vertical and Inclined Gates and Compound on Weir" M.Sc. Thesis Submitted to Mosul University, p110. (2002).