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力学学报  2015 

并列双圆柱流致振动的不对称振动和对称性迟滞研究

DOI: 10.6052/0459-1879-15-007, PP. 731-739

Keywords: 流致振动,并列双圆柱,不对称振动,对称性迟滞

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Abstract:

对雷诺数Re=100间距比s/D=2.5和5.0的并列双圆柱流致振动进行了数值模拟研究,其中圆柱质量比m=2.0,折合流速Ur在2.0~10.0之间,两圆柱仅能做横流向振动.研究发现,当间距比s/D=2.5时,在折合流速4.4UrUrs/D=2.5时,圆柱流致振动响应与单圆柱涡激振动响应相似,没有出现不对称振动和对称性迟滞现象.在不对称振动区间内,两圆柱的升、阻力参数也出现了不相等的情况.此外,当两圆柱不对称振动时,圆柱间隙流稳定地偏斜向其中的一个圆柱;相应地,尾涡也出现了宽窄不等的模式.窄尾流圆柱的振幅和升、阻力均较宽尾流圆柱的大.通过对比不对称振动现象发生前后的尾涡模式,对新现象的产生机制进行了阐述.

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