Double-Leaf Gate for Energy Dissipation below Regulators
Publication: Journal of Hydraulic Engineering
Volume 124, Issue 11
Abstract
This paper introduces a new design concept for energy dissipation below flow regulators. Instead of using a single-leaf sluice gate, a double-leaf gate design is suggested. The two leaves are arranged in such a way that a jet issues at an angle toward the water surface through the opening between the two leaves. The bottom leaf remains fixed while the top leaf (control leaf) is moved up and down to regulate the flow. By using this arrangement, the high velocity supercritical stream is deflected away from the bed to the water surface. In addition to minimizing erosion, a lifting device of smaller capacity will be adequate for operating the control leaf. The existing regulators can be modified by adding an upward sloping sill just below the gate. The flow patterns, velocity decay, momentum decay, and bed-shear stress for different submergence and offset ratios are studied experimentally. The main characteristics of the deflected jet and the surface jet are also investigated and compared with those of the free and submerged jumps and surface jets. The new dissipator performs well in comparison with free and submerged jumps.
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References
1.
Bakhmeteff, B. A., and Feodoroff, N. V.(1941). “Discussion of energy loss at the base of a free overfall.”Trans., ASCE, 108, 1364–1373.
2.
Elevatorski, E. A. (1959). Hydraulic energy dissipators. McGraw-Hill Inc., New York.
3.
Goldschmidt, V., and Eskinazi, S.(1966). “Two phase turbulent flow in a plane jet.”J. Appl. Mech., 33(4), 735–747.
4.
Hager, W. H. (1992). Energy dissipators and hydraulic jump. Kluwer Academic Publishers, Boston, Mass., 288.
5.
Heskestad, G.(1965). “Hot wire measurements in a plane turbulent jet.”J. Appl. Mech., 32(4), 721–734.
6.
Kotsovinos, N. E. (1975). “A study of the entrainment and turbulence in a plane turbulent jet.”Rep. KH R-32, W. M. Keck Lab. Hydr. Water Resour., California Inst. of Technol., Pasadena, Calif.
7.
Kotsovinos, N. E.(1978). “A note on the conservation of the axial momentum of a turbulent jet.”J. Fluid Mech., Cambridge, England, 87(7), 55–63.
8.
Liu, H. K. (1949). “Diffusion of flow from submerged sluice gate.” MS thesis, State Univ. of Iowa, Ames, Iowa, 32.
9.
Long, D., Rajaratnam, N., and Steffler, P. M.(1990). “LDA study of flow structure in submerged hydraulic jump.”J. Hydr. Res., 28(4), 437–460.
10.
Miller, D. R., and Comings, E. W.(1957). “Static pressure distribution in the free turbulent jet.”J. Fluid Mech., Cambridge, England, 3(10), 1–16.
11.
Narasimhan, S., and Bhargava, V. P.(1976). “Pressure fluctuations in submerged jump.”J. Hydr. Div., ASCE, 102(3), 339–350.
12.
Ohtsu, I., Yasuda, Y., and Awazu, S. (1990). “Free and submerged hydraulic jumps in rectangular channels.”Rep. No. 35, Res. Inst. of Sci. and Technol., Nihon Univ., Tokyo, 50.
13.
Patel, V. C.(1965). “Calibration of the Preston tube and limitations on its use in pressure gradients.”J. Fluid Mech., Cambridge, England, 23, 185–208.
14.
Peterka, A. J. (1963). “Hydraulic design of stilling basins and energy dissipators.”Engrg. Monograph 25, U.S. Dept. of the Interior, Bureau of Reclamation, Washington, D.C.
15.
Preston, J. H.(1954). “The determination of turbulent skin friction by means of pitot tubes.”J. Royal Aero. Soc., 54, 109–121.
16.
Rajaratnam, N.(1965). “The hydraulic jump as a wall jet.”J. Hydr. Div., ASCE, 91(5), 107–132.
17.
Rajaratnam, N.(1967a). “Hydraulic jumps.”Adv. in Hydroscience, 4, 198–276.
18.
Rajaratnam, N. (1976a). Turbulent jets. Elsevier Science Publishers BV, Amsterdam, The Netherlands, 304.
19.
Rajaratnam, N.(1976b). “Discussion of pressure fluctuations in submerged jump.”J. Hydr. Div., ASCE, 102(12), 1785–1787.
20.
Rajaratnam, N., and Humphries, J. A.(1984). “Turbulent non-buoyant surface jet.”J. Hydr. Res., 22(2), 103–115.
21.
Rajaratnam, N., and Subramanya, K. (1967b). “Diffusion of rectangular wall jets in wider channels.”Contributions to turbulent wall jets in hydraulic engineering and other related problems, Dept. of Civil Engineering, Univ. of Alberta, Edmonton, Canada.
22.
Rouse, H. Siao, T. T., and Nagaratnam, S. (1959). “Turbulence characteristics of the hydraulic jump.“Trans., ASCE, 124, 926–966.
23.
Sawyer, R. A.(1962). “The flow due to a two-dimensional jet issuing parallel to a flat plate.”J. Fluid Mech., Cambridge, England, 9(4), 543–560.
24.
Schneider, W.(1985). “Decay of momentum flux in submerged jets.”J. Fluid Mech., Cambridge, England, 154(5), 91–110.
25.
Schröder, R. (1963). “Die turbulente stromung im freien wechselsprung.”Habilitationsschrift Mitteilung 59, Institut fur Wasserbau and Wasserwirtschaft, TU Berlin, Berlin, Germany (in German).
26.
Thomas, F. S., Steven, E. R., and Michael, W. P.(1989). “Turbulent surface jet in channel of limited depth.”J. Hydr. Engrg., ASCE, 115(12), 1587–1606.
27.
Wu, S. (1994). “Four contributions to the application of turbulent jet theory in hydraulic engineering,” PhD thesis, Univ. of Alberta, Edmonton, AB, Canada.
28.
Wu, S., and Rajaratnam, N.(1995). “Effect of baffles on submerged flows.”J. Hydr. Div., ASCE, 121(9), 644–652.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 124 • Issue 11 • November 1998
Pages: 1134 - 1145
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Nov 1, 1998
Published in print: Nov 1998
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