第一作者刘志文男，博士，副教授，1975年7月生

邮箱：liuzhiwen757@126.com

串列双幅典型断面三分力系数气动干扰效应

刘志文，陈政清

(湖南大学土木工程学院，长沙410082)

摘要：采用风洞试验与数值模拟相结合的方法对串列双幅典型断面(矩形断面、Π型断面及流线型断面)三分力系数和斯脱罗哈数的气动干扰效应进行了研究。首先针对宽高比为5的单幅矩形断面分别进行了三分力系数的数值模拟和风洞试验测试，数值模拟结果与风洞试验结果吻合良好；然后对串列双幅典型断面不同间距比D/B(D为双幅断面之间净间距，B为单幅断面宽度)对应的三分力系数及斯脱罗哈数进行了数值模拟。研究显示：上游断面阻力系数与单幅断面比较接近，下游断面阻力系数则随间距比D/B的增加而增加；上游断面升力系数、升力矩系数脉动根方差气动干扰因子明显小于下游断面升力系数脉动根方差气动干扰因子，两者均随间距比D/B先增加后减小。

关键词：串列双幅断面；三分力系数；气动干扰效应；数值模拟；风洞试验

基金项目：国家自然科学基金资助项目(50608030, 51178181)；湖南省高校创新平台开放

收稿日期：2012-07-05修改稿收到日期：2013-12-19

中图分类号:U441.3文献标志码：A

Aerodynamic interference effects on aerostatic coefficients of typical sections in tandem arrangement

LIUZhi-wen,CHENZheng-qing(College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract:Aerodynamic interference effects on aerostatic coefficients and Strouhal numbers of two sections in tandem, namely, two rectangular sections in tandem, two Π-type sections in tandem and two streamlined sections in tandem, were investigated using numerical methods and wind tunnel tests. To validate the accuracy of the numerical methods, the numerical simulation of flow passing a fixed rectangular section with a width-to-depth ratio of 5 was carried out, and the numerical results agreed well with the experimental results. The aerostatic coefficients and Strouhal numbers of different types of two sections in tandom and with a varying separation ratio of D/B(D is the net distance between two sections in tandem, B is the width of the single section) were simulated separately with numerical methods. The results show that the drag coefficients of windward section are close to those of single section, and the drag coefficients of leeward section increase with the increase in D/B; the RMSs of lift and pitching moment coefficients of windward section are significantly less than those of leeward section, and they first increase and then decrease with the increase in D/B.

Key words:two sections in tandem arrangement; aerostatic coefficient; aerodynamic interference effect; numerical simulation; wind tunnel experiment

随着交通量的增加，如何提高桥梁的通行能力越来越受到重视，建设双层桥面桥梁或双幅桥面桥梁是解决这一问题的主要措施之一。在工程实践中，双幅桥面桥梁主要有以下两大类：①桥梁新建时将主梁设计成平行且相互独立分离的两幅桥；……