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    Local Scour around a Model Hydrokinetic Turbine in an Erodible Channel

    Source: Journal of Hydraulic Engineering:;2014:;Volume ( 140 ):;issue: 008
    Author:
    Craig Hill
    ,
    Mirko Musa
    ,
    Leonardo P. Chamorro
    ,
    Chris Ellis
    ,
    Michele Guala
    DOI: 10.1061/(ASCE)HY.1943-7900.0000900
    Publisher: American Society of Civil Engineers
    Abstract: Laboratory experiments were performed to study the effect of an axial-flow hydrokinetic turbine model on an erodible channel under both clear water and live-bed conditions. Clear water experiments were performed at two scales with a local bed shear stress just below the critical state. Live-bed experiments, performed at small scale, examined the interactions between relatively large-scale bedforms and the flow induced by an axial flow turbine. Spatiotemporal topographic measurements were obtained by sonar and by a state-of-the-art high-resolution scanning system integrated into an automated data acquisition carriage designed and fabricated at the St. Anthony Falls Laboratory at the Univ. of Minnesota. Results indicate that the presence of the turbine rotor increases the local shear stress resulting in accelerated and expanded scour development when compared with typical bridge pier scour mechanisms. The inferred key difference is the alteration of the flow patterns in the rotor wake leading to an accelerated flow region below the bottom tip. The footprint of the rotor is observed in the extension and scaling of the bed surface area impacted by the turbine and consistent with the near-wake region. Temporally averaged bed topography data from live-bed experiments indicate amplified scour depths in the turbine near-wake region as compared with the clear water results despite spatial patterns remaining qualitatively similar.
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      Local Scour around a Model Hydrokinetic Turbine in an Erodible Channel

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    contributor authorCraig Hill
    contributor authorMirko Musa
    contributor authorLeonardo P. Chamorro
    contributor authorChris Ellis
    contributor authorMichele Guala
    date accessioned2017-05-08T22:09:30Z
    date available2017-05-08T22:09:30Z
    date copyrightAugust 2014
    date issued2014
    identifier other35464460.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/72505
    description abstractLaboratory experiments were performed to study the effect of an axial-flow hydrokinetic turbine model on an erodible channel under both clear water and live-bed conditions. Clear water experiments were performed at two scales with a local bed shear stress just below the critical state. Live-bed experiments, performed at small scale, examined the interactions between relatively large-scale bedforms and the flow induced by an axial flow turbine. Spatiotemporal topographic measurements were obtained by sonar and by a state-of-the-art high-resolution scanning system integrated into an automated data acquisition carriage designed and fabricated at the St. Anthony Falls Laboratory at the Univ. of Minnesota. Results indicate that the presence of the turbine rotor increases the local shear stress resulting in accelerated and expanded scour development when compared with typical bridge pier scour mechanisms. The inferred key difference is the alteration of the flow patterns in the rotor wake leading to an accelerated flow region below the bottom tip. The footprint of the rotor is observed in the extension and scaling of the bed surface area impacted by the turbine and consistent with the near-wake region. Temporally averaged bed topography data from live-bed experiments indicate amplified scour depths in the turbine near-wake region as compared with the clear water results despite spatial patterns remaining qualitatively similar.
    publisherAmerican Society of Civil Engineers
    titleLocal Scour around a Model Hydrokinetic Turbine in an Erodible Channel
    typeJournal Paper
    journal volume140
    journal issue8
    journal titleJournal of Hydraulic Engineering
    identifier doi10.1061/(ASCE)HY.1943-7900.0000900
    treeJournal of Hydraulic Engineering:;2014:;Volume ( 140 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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