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Numerical study of the effect of trailing edge bluntness on highly turbulent hydrofoil flow

机译:后缘钝性对高湍流水翼流动影响的数值研究

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摘要

Turbulent trailing edge flow over control surfaces continues to be of interest to many designers and researchers alike due to the associated complex and adverse phenomena. In this study a two dimensional NACA0015 airfoil was modified at the trailing edge by vertically `cutting' at various locations along the chord axis thereby changing the Reynolds number based on the trailing edge height, while keeping the chord-length based Reynolds number fixed at 3.49 million. The numerical results show the bluntness parameter at onset of vortex shedding agree well with published data for sections having a blunt trailing edge. A parametric study suggests that increasing the trailing edge height tends to reduce the frequency of vortex shedding. Also, the variational trend of wake formation lengths with increasing trailing edge Reynolds number resembles that of flow past a circular cylinder. The Strouhal number for this blunt section is approximately 0.09.
机译:由于相关的复杂和不利现象,控制面上的湍流后缘流动仍然是许多设计者和研究人员所关注的。在这项研究中,通过沿弦轴的各个位置垂直“切割”,在后缘修改了二维NACA0015翼型,从而根据后缘高度改变了雷诺数,同时将基于弦长的雷诺数保持在3.49上。百万。数值结果表明,在涡旋脱落开始时的钝度参数与后缘钝的截面的公开数据非常吻合。一项参数研究表明,增加后缘高度会降低涡旋脱落的频率。同样,尾流雷诺数增加时,尾流形成长度的变化趋势类似于经过圆柱体的流动。这个钝部分的斯特劳哈尔数约为0.09。

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    Do T; Chen L; Tu J;

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  • 年度 2007
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