典型钝体断面大攻角下的颤振自激力特性

刘慕广;陈政清

振动与冲击 ›› 2013, Vol. 32 ›› Issue (10) : 22-25.

PDF(1422 KB)
PDF(1422 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (10) : 22-25.
论文

典型钝体断面大攻角下的颤振自激力特性

  • 刘慕广1, 陈政清2
作者信息 +

Characteristics of flutter self-excited forces for typical blunt body under large attack angles

  • Liu Mu-guang1, Chen Zheng-qing2
Author information +
文章历史 +

摘要

基于三自由度强迫振动装置,真实模拟了实际结构大攻角下的弯曲振动形态,并以矩形和H型截面为研究对象,对比分析了竖向振动方式对H1*、H4*、A1*、A4*等4个气动导数的影响。试验研究发现,弯曲振动形态对H1*、H4*、A1*三个气动导数存在明显影响,对导数A4*影响较小,且对气动导数的影响程度与风攻角和截面形式有关;不过,振动形态不影响各导数随无量纲风速的变化规律。分析表明,大攻角下采取与实际结构一致的竖弯振动方式来识别气动导数是完全必要的。

Abstract

Based on three degrees of freedom forced vibration device, the actual bending vibration modes at large attack angles for real structure were simulation, and the influence of vertical vibration on the aerodynamic derivatives H1*、H4*、A1*、A4*, was further investigated through a series of wind tunnel tests with rectangle and H-section. The results show that vertical vibration modes have obvious effect on aerodynamic derivatives H1*、H4*、A1*, and the influence degree is relevant with wind attack angle and cross section. However, the variation of aerodynamic derivatives versus the non-dimensional wind speed do not affect by vibration modes. Contrastive analysis shows that it is necessary to identify the flutter derivatives with vertical bending vibration mode consistent with the actual structure under large attack angles.

关键词

风洞试验 / 强迫振动法 / 大攻角 / 振动形态 / 气动导数

Key words

wind tunnel experiment / forced vibration method / large attack angles / vibration mode / aerodynamic derivatives

引用本文

导出引用
刘慕广;陈政清. 典型钝体断面大攻角下的颤振自激力特性[J]. 振动与冲击, 2013, 32(10): 22-25
Liu Mu-guang;Chen Zheng-qing. Characteristics of flutter self-excited forces for typical blunt body under large attack angles[J]. Journal of Vibration and Shock, 2013, 32(10): 22-25

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