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机构地区:[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [3]河海大学土木与交通学院,江苏南京210098
出 处:《建筑结构学报》2016年第1期56-64,共9页Journal of Building Structures
基 金:国家自然科学基金面上项目(51278160;51478155)
摘 要:通过有限的风洞试验数据,揭示雷诺数效应的发生、发展机理,关键在于找出能够有效表征雷诺数效应的特征参数。以经典圆柱模型为研究对象,在系列雷诺数效应风洞试验基础上,从边界层分离、转捩和旋涡脱落等方面,研究了表征雷诺数效应的气动参数及其数据识别方法。针对经典圆柱模型,采用压力系数时程和压力梯度提取有关边界层分离和流动转捩的物理信息。研究表明,在分离边界层转捩区间内分离点附近的压力系数时程会出现明显的阶跃现象,并伴有骤增的压力梯度值,可作为判定雷诺数转捩区间的辅助方法。为研究不同雷诺数下模型周围主导旋涡的作用特点,采用谱正交分解法(SPT)来识别旋涡作用及其对脉动风压场的能量贡献等,旨在对类似结构的雷诺数效应研究提供参考。In order to reveal the mechanisms causing and influencing the Reynolds number effect with limited transition can be derived from the pressure coefficient time histories and pressure gradient distributions. It is found that in the particular critical regime, the pressure coefficient time histories show strong instability near the separation point with the occurrence of pressure jumps, resulting in large magnitude of pressure gradient, which can be used for recognizing the flow transition indirectly. Finally, to investigate the advection features of dominant vortex structures at various Re numbers, the spectral proper transformation (SFT) technique was utilized to identify the vortex structures and evaluate their energy contribution to the pressure field, which has been introduced and demonstrated some potent}als to study the Reynolds number effect of bluff bodies with similar geometries.
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