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中文摘要：
钝尾缘翼型气动特性受到尾涡脱落的影响,在翼型DU 91-W2-250的基础上对称加厚得到了新钝尾缘翼型DU91-W2-250_6,利用密网格进行了非定常气动特性的数值研究。在各个攻角下钝尾缘翼型气动特性都具有周期性的特点,具体的波动特征如波动幅值及周期等则受脱落涡的大小、脱落位置及尾迹宽度的影响,而升力系数波峰、波谷则分别出现在顺时针涡及逆时针涡脱落的时刻。
英文摘要：
The aerodynamic performance of blunt trailing-edge airfoils is always affected by the shedding of wake;therefore,the unsteady aerodynamic performance of airfoil DU91-W2-250_6 which is from DU 91-W2-250 by symmetrically adding thickness on both sides of the airfoil was numerically investigated with fine grids in this paper.The performance is periodic at every angle of attack,and the specific characteristics such as the amplitude and period is influenced by the size and location of shedding vortex and by the width of the wake.The lift coefficients reaches the peak when the anticlockwise vortex just sheds from the trailing edge,while it reaches the valley when the clockwise vortex just sheds.
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