端部状态对斜拉索节段模型气动特性的影响

发布时间：2018-04-18 03:28

本文选题：风洞试验 + 斜拉索　；参考：《工程力学》2017年S1期

【摘要】：在使用节段模型的风洞试验中,端板或补偿模型常被用于减小端部效应的影响。为了明确端板、补偿模型对斜拉索节段模型气动特性测试结果的影响,通过刚性模型测力试验的方法,研究了补偿模型安装间距对模型阻力系数的影响;通过刚性模型测力、测压试验的方法,分析了端板尺寸对模型阻力系数、风压系数的影响。研究结果表明:当模型长细比小于18时,补偿模型这种措施不能消除端部效应的影响;端部效应,不仅对端部附近的风压分布有影响,对中间位置的影响也不容忽视;端板尺寸较小时不能保证中间位置的二维流动;随着端板尺寸增大,阻力系数逐渐增大,当端板尺寸大于4倍模型直径后,阻力系数不再明显改变。
[Abstract]:In wind tunnel tests using segmental models, end plates or compensation models are often used to reduce the effect of end effects.In order to clarify the effect of the end plate and compensation model on the test results of aerodynamic characteristics of the cable segment model, the effect of the compensation model installation distance on the model resistance coefficient was studied by the rigid model force measurement method, and the force measurement by the rigid model was carried out.The influence of the end plate size on the model resistance coefficient and wind pressure coefficient is analyzed.The results show that when the aspect ratio of the model is less than 18:00, the compensation model can not eliminate the effect of the end effect, and the end effect not only has an effect on the wind pressure distribution near the end, but also on the middle position.With the increase of the end plate size, the resistance coefficient increases gradually, and when the end plate size is larger than 4 times the model diameter, the resistance coefficient does not change obviously.
【作者单位】：石家庄铁道大学土木工程学院;石家庄铁道大学大型结构健康诊断与控制研究所;河北省大型结构健康诊断与控制重点实验室;
【基金】：国家自然科学基金项目(51378323,51108280,51308359) 河北省杰出青年基金项目(E2014210138)
【分类号】：U441.3

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