矩形断面抖振力展向相关性的试验研究

发布时间：2018-03-25 07:55

本文选题：抖振力　切入点：展向相关性　出处：《工程力学》2016年01期

【摘要】：为了研究紊流作用下钝体的非定常气动力(抖振力),以矩形断面为例,通过测压试验研究不同紊流积分尺度下的非定常气动力的分布特性,并结合理论分析方法研究了现有导纳识别方法的缺陷,进而提出基于三维统计理论的两波数三维导纳初步识别方法。结果表明:对于矩形这类钝体断面,其在紊流下的抖振力特性与流线型箱梁(桥梁主梁)接近,即抖振力的相关性高于脉动风速的相关性,且与紊流积分尺度成正比。另外,理论分析结果与实测数据间存在较大的差异,进一步表明传统的二维导纳函数无法反映真实的非定常气动力展向分布情况,而两波数的三维导纳则可揭示展向不同尺度漩涡都对抖振力的贡献。
[Abstract]:In order to study the unsteady aerodynamic force (buffeting force) of a blunt body under turbulent action, the distribution characteristics of unsteady aerodynamic force under different turbulent integral scales are studied by means of pressure measurement tests with a rectangular section as an example. Combined with the theoretical analysis method, the defects of the existing admittance identification methods are studied, and a preliminary identification method of two-wave-number three-dimensional admittance based on three-dimensional statistical theory is proposed. The results show that: for obtuse body sections such as rectangles, The buffeting force characteristic under turbulence is close to that of streamlined box girder (bridge main girder), that is, the correlation of buffeting force is higher than that of pulsating wind speed, and is proportional to the integral scale of turbulence. There is a great difference between the theoretical analysis results and the measured data, which further indicates that the traditional two-dimensional admittance function can not reflect the true unsteady aerodynamic spread distribution. The three-dimensional admittance of two wave numbers can reveal the contribution of spanwise vortex to buffeting force.
【作者单位】：西南交通大学风工程试验研究中心;风工程四川省重点实验室;
【基金】：国家自然科学基金项目(51278435)
【分类号】：O32

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