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    Aerodynamic Effects of Inclined Portals on the Initial Compression Wave Generated by a High Speed Train Entering a Tunnel

    Source: Journal of Fluids Engineering:;2015:;volume( 137 ):;issue: 012::page 121104
    Author:
    Xiang, Xintao
    ,
    Xue, Leiping
    ,
    Wang, Benlong
    DOI: 10.1115/1.4030843
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The micropressure wave radiated from a tunnel exit is one of the environmental problems which can be investigated from the temporal pressure gradient of the compression wave. The effects of inclined portals on the initial compression wave, specifically the maximum temporal pressure gradient, are numerically studied by solving the flow field during a highspeed train nose entering a tunnel, using the unsteady threedimensional (3D) Euler equations. After mesh independency and temporal sensitivity tests of the numerical method, validations are conducted by comparing the numerical results with experimental and numerical data. The temporal gradients of pressure wavefront are parametrically investigated for different combinations among the train speed, the blockage ratio of the train to tunnel, and inclination angle of the tunnel entrance. The numerical results show a negligible influence of train Mach number or blockage ratio on the normalized pressure gradient and noticeable effects of inclination angle, location of the train with respect to the median line of a doubletracked tunnel (DT), and the profile of train nose. Based on the numerical results, an empirical formula is proposed to predict the relationship between the maximum pressure gradient and the inclination angle of tunnel entrance.
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      Aerodynamic Effects of Inclined Portals on the Initial Compression Wave Generated by a High Speed Train Entering a Tunnel

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/158339
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    contributor authorXiang, Xintao
    contributor authorXue, Leiping
    contributor authorWang, Benlong
    date accessioned2017-05-09T01:19:15Z
    date available2017-05-09T01:19:15Z
    date issued2015
    identifier issn0098-2202
    identifier otherfe_137_12_121104.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/158339
    description abstractThe micropressure wave radiated from a tunnel exit is one of the environmental problems which can be investigated from the temporal pressure gradient of the compression wave. The effects of inclined portals on the initial compression wave, specifically the maximum temporal pressure gradient, are numerically studied by solving the flow field during a highspeed train nose entering a tunnel, using the unsteady threedimensional (3D) Euler equations. After mesh independency and temporal sensitivity tests of the numerical method, validations are conducted by comparing the numerical results with experimental and numerical data. The temporal gradients of pressure wavefront are parametrically investigated for different combinations among the train speed, the blockage ratio of the train to tunnel, and inclination angle of the tunnel entrance. The numerical results show a negligible influence of train Mach number or blockage ratio on the normalized pressure gradient and noticeable effects of inclination angle, location of the train with respect to the median line of a doubletracked tunnel (DT), and the profile of train nose. Based on the numerical results, an empirical formula is proposed to predict the relationship between the maximum pressure gradient and the inclination angle of tunnel entrance.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAerodynamic Effects of Inclined Portals on the Initial Compression Wave Generated by a High Speed Train Entering a Tunnel
    typeJournal Paper
    journal volume137
    journal issue12
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4030843
    journal fristpage121104
    journal lastpage121104
    identifier eissn1528-901X
    treeJournal of Fluids Engineering:;2015:;volume( 137 ):;issue: 012
    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
    yabeshDSpacePersian