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力学学报  2015 

纵向沟槽壁面湍流边界层内类开尔文-亥姆霍兹涡结构的流动显示

DOI: 10.6052/0459-1879-14-345, PP. 529-533

Keywords: 湍流边界层,开尔文-亥姆霍兹不稳定性,“类开尔文-亥姆霍兹”涡,沟槽,流动显示

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Abstract:

纵向沟槽壁面的湍流边界层,当沟槽的脊-脊内尺度无量纲展向间距s+在一定范围内,与光滑壁面湍流边界层相比,具有减阻效应;并在s+约为17个黏性长度单位时减阻效果达到最优,之后其减阻趋弱,直至增阻;其原因可能是沟槽壁面湍流边界层由于“开尔文-亥姆霍兹”不稳定性而产生的一种“类开尔文-亥姆霍兹”展向涡结构.实验采用烟雾流动显示技术,首次在风洞中显示了这种“类开尔文-亥姆霍兹”展向涡结构,确认了其存在性,并在概念上简单勾勒了其结构模型.

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