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    Aeration Characteristics of Ski Jump Jets

    Source: Journal of Hydraulic Engineering:;2008:;Volume ( 134 ):;issue: 001
    Author:
    Lukas Schmocker
    ,
    Michael Pfister
    ,
    Willi H. Hager
    ,
    Hans-Erwin Minor
    DOI: 10.1061/(ASCE)0733-9429(2008)134:1(90)
    Publisher: American Society of Civil Engineers
    Abstract: Scour downstream of ski jumps may be avoided by jet deflection to an area where the energy dissipation is accomplished. The main purpose of this experimental study was the analysis of the jet air entrainment downstream of a ski jump, both for pure water and preaerated approach flow conditions. A systematic variation of the Froude number and the flow depth in the approach flow channel resulted in a range of discharge characteristics, whereas the geometry of the ski jump was maintained for all tests. The air concentration profile was measured at different locations downstream from the ski jump to evaluate the: (1) jet air concentration distribution; (2) location of minimum air concentration along the mixture flow jet and development of the minimum and the cross-sectional average air concentrations; (3) jet trajectories; and (4) process of air entrainment characteristics and jet disintegration. The results demonstrate the significant effect of the approach flow Froude number, the approach flow depth, and of preaeration on jet disintegration.
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      Aeration Characteristics of Ski Jump Jets

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    http://yetl.yabesh.ir/yetl1/handle/yetl/26373
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    contributor authorLukas Schmocker
    contributor authorMichael Pfister
    contributor authorWilli H. Hager
    contributor authorHans-Erwin Minor
    date accessioned2017-05-08T20:45:55Z
    date available2017-05-08T20:45:55Z
    date copyrightJanuary 2008
    date issued2008
    identifier other%28asce%290733-9429%282008%29134%3A1%2890%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/26373
    description abstractScour downstream of ski jumps may be avoided by jet deflection to an area where the energy dissipation is accomplished. The main purpose of this experimental study was the analysis of the jet air entrainment downstream of a ski jump, both for pure water and preaerated approach flow conditions. A systematic variation of the Froude number and the flow depth in the approach flow channel resulted in a range of discharge characteristics, whereas the geometry of the ski jump was maintained for all tests. The air concentration profile was measured at different locations downstream from the ski jump to evaluate the: (1) jet air concentration distribution; (2) location of minimum air concentration along the mixture flow jet and development of the minimum and the cross-sectional average air concentrations; (3) jet trajectories; and (4) process of air entrainment characteristics and jet disintegration. The results demonstrate the significant effect of the approach flow Froude number, the approach flow depth, and of preaeration on jet disintegration.
    publisherAmerican Society of Civil Engineers
    titleAeration Characteristics of Ski Jump Jets
    typeJournal Paper
    journal volume134
    journal issue1
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)0733-9429(2008)134:1(90)
    treeJournal of Hydraulic Engineering:;2008:;Volume ( 134 ):;issue: 001
    contenttypeFulltext
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