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Experimental studies on intake headloss of a blasted lake tap
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Vattendragsteknik. Vattenfall Research and Development, Sweden .
2014 (engelsk)Inngår i: IOP Conference Series: Earth and Environmental Science, 2014Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
2014.
Serie
IOP Conference Series: Earth and Environmental Science, ISSN 1755-1307 ; 042011
Emneord [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
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-167608DOI: 10.1088/1755-1315/22/4/042011ISI: 000347441900125Scopus ID: 2-s2.0-84919608971OAI: oai:DiVA.org:kth-167608DiVA, id: diva2:814796
Konferanse
27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014, 22 September 2014 through 26 September 2014
Merknad

QC 20150528

Tilgjengelig fra: 2015-05-28 Laget: 2015-05-22 Sist oppdatert: 2015-05-28bibliografisk kontrollert

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