宽高比为10的矩形断面气动特性试验研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (14) : 109-115.

论文

宽高比为10的矩形断面气动特性试验研究

杨晶1，许福友1，曾冬雷2

作者信息 +

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

YANG Jing1，XU Fuyou1，ZENG Donglei2

Author information +

文章历史 +

摘要

采用表面测压方法研究了宽高比为10的矩形断面在不同风速、不同初始攻角、不同扭转振幅条件下的断面不同位置风压系数的均值、标准差、斜度和峰度及相关系数，分析了大幅扭转振动状态下非线性和非高斯自激力分布规律。研究结果表明：风压系数均值和标准差与初始攻角和振幅紧密相关，风速影响基本可以忽略；随着振幅的增大，气流分离增强，气流再附位置向下游移动；断面不同位置风压相关性随着振幅和风速的增大而增强；气动扭矩的高阶谐波成分主要是由于气流分离和再附引起，高阶谐波分量所占比重随着振幅的增大而增大。

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.

导出引用

杨晶1，许福友1，曾冬雷2. 宽高比为10的矩形断面气动特性试验研究[J]. 振动与冲击, 2020, 39(14): 109-115

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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