Helicoidal‐Ramp Dropshaft
Publication: Journal of Hydraulic Engineering
Volume 114, Issue 3
Abstract
A new type of spiral‐flow dropshaft, composed of a vertical circular shaft with tangential inlet and outlet conduits and one or more continuous helicoidal ramps attached to the shaft wall, is described. Experimental results indicate that these helicoidal‐ramp dropshafts are superior to other types of dropshafts both in their energy‐dissipation and air‐handling characteristics. Additionally, the needs for energy‐dissipation and deaeration chambers at the bottoms of these structures are obviated. The friction factors of flows along the channels formed by the helicoidal ramps are somewhat higher than those of equivalent straightchannel flows. Prototype‐installation experience indicates that helicoidal‐ramp dropshafts are significantly cheaper than conventional ones in installations requiring low air discharges from and intensive energy dissipation in the dropshafts.
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References
1.
Anderson, A. G., and Dahlin, W. Q. (1975). “Dropshafts for the tunnel and reservoir plan.” Project No. 154, St. Anthony Falls Hydraulic Laboratory, University of Minnesota, Minneapolis, Minn.
2.
Berger, S. A., Talbot, L., and Yao, L.‐S. (1983). “Flow in curved pipes.” Annual Review of Fluid Mech., 15, 461–512.
3.
Muck, K. C., Hoffmann, P. H., and Bradshaw, P. (1985). “The effect of concave surface on turbulent boundary layers.” J. Fluid Mech., 161, 371–403.
4.
Jain, S. C., and Kennedy, J. F. (1983). “Vortex‐flow dropstructures for the Milwaukee Metropolitan Sewage District inline storage system.” IIHR Report No. 264, Iowa Institute of Hydraulic Research, The University of Iowa, Iowa City, Iowa.
5.
Mosconi, C. E. (1984). “Effect of streamline curvature on friction factors,” thesis presented to the Department of Civil and Environmental Engineering, the University of Iowa, at Iowa City, Iowa, in partial fulfillment of the requirements for the degree of Master of Science.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 114 • Issue 3 • March 1988
Pages: 315 - 325
Copyright
Copyright © 1988 ASCE.
History
Published online: Mar 1, 1988
Published in print: Mar 1988
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