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    題名: Aerodynamics of a Vibrating Square Prism in Homogeneous Turbulent Flows
    其他題名: 均勻紊流場中二維方柱受強制振動之氣動力研究
    作者: Lu, Po-chien;Chen, Rou-hwa;Cheng, Chi-ming;Huang, Jean-houng
    貢獻者: 淡江大學水資源及環境工程學系;淡江大學土木工程學系
    關鍵詞: Forced oscillating;Lock-in;Homogeneous turbulent flows;強制振動;鎖定現象;均勻紊流場
    日期: 1996-05
    上傳時間: 2013-07-11 12:00:35 (UTC+8)
    出版者: Taipei : Chinese Institute of Chemical Engineers
    摘要: A series of experiments have been conducted to investigate the mean drag coefficient (CD ), fluctuating drag coefficient (CD‘), fluctuating lift coefficient (CL‘), spanwise correlation, vorticity of the wake, wake velocity spectrum and lift spectrum of a square prism due to forced vibration normal to approaching turbulence flows. The frequencies and amplitudes of vibration, the turbulence intensities, and the length scales of flow fields have been controlled as the parameters of the experiments.
    The results show that the wind coefficients are much greater when the oscillating cylinder is in the lock‐in range rather than stationary and reach peak value at the resonant frequency, while the wake vorticity attains maximum values.
    High turbulence intensity will weaken the vortex shedding due to the effect of shear layer mixing, so the wake vorticity and wind coefficients, CD and CL’, respectively, and the peak values of the spectrum of velocity and lift force will be decreased, while, on the contrary, CD’ will increase. As the turbulence length scale increases, the vorticity of wake and wind coefficients will increase proportional to the oscillating amplitude.
    關聯: Journal of the Chinese Institute of Engineers=中國工程學刊 19(3), pp.353-361
    DOI: 10.1080/02533839.1996.9677796
    顯示於類別:[教育科技學系暨研究所] 會議論文
    [水資源及環境工程學系暨研究所] 期刊論文

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