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近尾迹中平板对钝物体的干扰

DOI: doi:10.3969/j.issn.1006-7043.2011.03.001

Keywords: 钝物体, 干扰, 旋涡, 交变力, 斯特罗哈数

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Abstract:

为了减小作用在钝物体上的交变力进而有效地降低结构振动和噪声,以有限体积法分别采用层流模型、标准k-ε湍流模型,计算了不同Re数和截面形状的钝物体的流体动力性能;并通过在钝物体近尾迹区域水平布置一平板,降低上游钝物体尾涡脱落频率和作用在钝物体上周期性交变力.研究发现存在最优的平板布置位置,可以最大程度地降低作用在钝物体上的周期性交变力以及斯特罗哈数.同时,随着平板尺度的增加,钝物体和平板的升力系数、阻力系数也都随之减小.

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