Experimental study on the aerodynamic characteristics of a rectangular cylinder with the width/height ratio of 10

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (14) : 109-115.

YANG Jing1，XU Fuyou1，ZENG Donglei2

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Abstract

For a rectangular cylinder with the width/height ratio of 10, a series of wind tunnel tests with synchronous surface pressure measurement were carried out to investigate the mean, standard deviation, skewness, kurtosis, and correlation coefficient of pressure coefficients under different wind speeds, different initial angles of attack, and different torsional amplitudes.The nonlinear and non-Gaussian distribution characteristics of self-excited forces under large torsional vibration were analyzed.The results indicate that, the mean and standard deviation of pressure coefficients are mainly determined by the initial angle of attack and vibration amplitude, and the influence of wind speed can be neglected.With the increase of vibration amplitude, the separation of airflow is enhanced and the positions of airflow reattachment move to downstream.The pressure correlations enhance with the increasing of torsional amplitude and wind speed.The higher-order harmonic components of the self-excited torsional moment are mainly caused by airflow separation and reattachment.The ratios of higher-order harmonic components increase with the increasing of torsional amplitude.

Key words

rectangular cylinder / forced vibration / wind tunnel test / statistical property / correlation / high-order harmonic

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YANG Jing1，XU Fuyou1，ZENG Donglei2. Experimental study on the aerodynamic characteristics of a rectangular cylinder with the width/height ratio of 10[J]. Journal of Vibration and Shock, 2020, 39(14): 109-115

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