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Experimental studies on intake headloss of a blasted lake tap
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. Vattenfall Research and Development, Sweden .
2014 (English)In: IOP Conference Series: Earth and Environmental Science, 2014Conference paper (Refereed)
Abstract [en]

In existing reservoirs, construction of an intake is sometimes achieved by so-called lake tapping, a submerged tunnel piercing by blasting out the rock plug at the intake. The blasting process involves phases of rock, water, air and gas released from the explosive charge; the resulting entrance profile often differs from design assumptions. The intake headloss is a factor of concern for power generation. For a vertical intake formed by lake tapping, experiments have been carried out in a 1:30 physical model to examine the effect of entrance shapes on intake headlosses. The purpose is that, if there is potential to reduce the headlosses, the originally blasted intake shape would be modified. In the model, five alternative shapes are evaluated. The test results show that to enlarge the vertical shaft area is the most effective way to reduce the intake headloss; to further blast out a narrow channel upstream does not give much effect. Bearing in mind the risk of free-surface vortex at the intake, the influence of the intake modifications on vortex is also checked.

Place, publisher, year, edition, pages
, IOP Conference Series: Earth and Environmental Science, ISSN 1755-1307 ; 042011
Keyword [en]
Blasting, Hydraulic equipment, Hydraulic machinery, Lakes, Vortex flow, Explosive charges, Free-surface vortices, Narrow channel, Physical model, Submerged tunnels, Vertical shaft, Explosives, experimental study, power generation, vortex
National Category
Water Engineering
URN: urn:nbn:se:kth:diva-167608DOI: 10.1088/1755-1315/22/4/042011ISI: 000347441900125ScopusID: 2-s2.0-84919608971OAI: diva2:814796
27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014, 22 September 2014 through 26 September 2014

QC 20150528

Available from: 2015-05-28 Created: 2015-05-22 Last updated: 2015-05-28Bibliographically approved

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Yang, James
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