摘要
该文通过风洞试验研究了箱型吊杆的风振特性,并进一步分析了紊流对吊杆气动性能的影响。箱型吊杆会发生涡振与驰振失稳,高宽比对涡振特性存在较显著影响,对改善驰振性能作用不大。紊流对箱型吊杆涡振起振风速及锁定区间有较大影响,但紊流的作用并不总是有利的。相应的数值模拟显示,紊流是通过改变结构的St数与涡脱力的大小来影响结构的涡振特性。
This paper discusses the aerodynamic performance of box suspender based on wind tunnel experiments, and the effect of turbulence flow on the aerodynamic characteristics of suspender is further studied. The suspenders with rectangular section could lead to vortex resonance and galloping instability, and the depth-to-width ratios have significant impact on vortex-induced vibrations but little effect on galloping. Turbulence flow mainly affects the onset wind speed and lock-in range of vortex resonance, but the turbulence effects on aerodynamic characteristics of box suspender are not always beneficial. The results of corresponding numerical simulation show that turbulent flow changes the Strouhal numbers and the force of vortex shedding to affect the vortex resonance characteristics of box suspenders.
出处
《工程力学》
EI
CSCD
北大核心
2013年第3期233-238,共6页
Engineering Mechanics
基金
华南理工大学中央高校基本科研业务费项目(2009ZM0110)
华南理工大学自然科学青年基金项目(E5090740)
湖南大学风工程与桥梁工程湖南省重点实验室开放基金项目
关键词
风洞试验
数值模拟
紊流效应
箱型吊杆
涡振
驰振
wind tunnel experiment
numerical simulation
turbulence effect
box suspender
vortex-resonance
galloping
