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    Title: 衝擊流中紊流產生器對熱傳及流場特性探討
    Other Titles: Heat Transfer and Flow Characteristics in Impinging Flows with Turbulators
    Authors: 陳增源;Chen, Tseng-yuan
    Contributors: 淡江大學航空太空工程學系
    Keywords: 熱傳;衝擊流;渦流產生器;Heat transfer;Impinging flow;Turbulator
    Date: 2003-12
    Issue Date: 2010-01-11 15:02:19 (UTC+8)
    Publisher: 成功大學
    Abstract: 本研究實驗探討衝擊流中,紊流產生器對流場結構及熱傳之影響。衝擊流特性係
    利用一7*7cm/sup 2/管道,其一端連接一風洞系統,在管道入口產生一均勻流,
    而管道另一端中央置有一垂直於流場、4*4cm/sup 2/之加熱板,用來當作熱傳面
    ;在管道入口附近、左右側壁置於成對之紊流產生器,包括有45°與90°矩形板
    及三角翼四種。研究中以雷射測速儀量測管道軸向斷面及靠近熱傳面三方向之平
    均及擾動速度,以獲得近熱傳面之軸向平均速度、軸向渦流及擾動動能。而熱傳
    面之溫度由熱電偶絲(Thermocouple)量測,藉以獲得Nusselt number。實驗結
    果顯示在衝擊流中加裝紊流產生器會增加近熱傳面之軸向平均速度、軸向渦流及
    擾動動能,並造成熱傳之增益,其熱傳增益雷諾數增加而增加,且90°矩形板紊
    流產生器有最好之熱傳增益。
    The flow and heat transfer characteristics in impinging flows with
    turbulators were experimentally investigated. A uniform flow was
    generated at the inlet of a 7*7cm/sup 2/ duct by a wind tunnel, and a
    4*4cm/sup 2/ heat transfer plate was placed at the other end of the
    duct for heat transfer surface, perpendicular to the incoming flow. A
    Pair of turbulator was mounted on the left and right duct walls near
    the inlet of the duct, which included rectangular-plate and
    triangular-plate turbulators, 45° and 90° angle of attack. The
    studies included three-component mean and fluctuating velocity
    measurements at duct axial cross-section and near the heat transfer
    surface using laser Doppler velocimetry. The axial vorticity,
    turbulent kinetic energy and axial mean velocity near the heat
    transfer surface were obtained from the measured velocity data. The
    temperatures on the heat transfer surface were measured using type-T
    thermocouples to obtain the Nusselt numbers. Results show that the
    turbulators in impinging flows have the effect to increase the axial
    vorticity, turbulent kinetic energy and averaged axial mean velocity
    and, thus, to augment the heat transfer. The heat transfer
    augmentation increases with increasing Reynolds numbers, and the 90°
    rectangular-plate turbulator causes the largest heat transfer
    augmentation among the investigated turbulators.
    Relation: 2003年中國航空太空學會/中華民用航空學會暨國科會航太學門研究成果發表會暨教育部九十二年度航太科技教育改進計畫成果發表會論文集(下冊),頁1334-1340
    Appears in Collections:[航空太空工程學系暨研究所] 會議論文

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