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中文摘要：
在研究DU系列翼型的空气动力特性时,发现DU97-W-300翼型的升阻力随时间变化。通过对比多种攻角和多种后缘厚度下的升阻力随时间变化曲线,发现该现象与边界层分离有关,而且后缘厚度对边界层分离有重要影响。最后得出结论：翼型后缘厚度存在一个临界值,当后缘厚度大于临界值时,受力不稳定,小于它时受力稳定。
英文摘要：
In the studing of aerodynamic performance on DU series airfoils,the drag and lift of DU97-W-300 airfoil were found unsteady.By comparing variable graphs against time of drag and lift for many kinds of incidence and thickness of trailing edge,it was found that boundary-layer separation had something to do with this phenomenon,and thickness of trailing edge had vital influence on boundary-layer separation.The study result show that there is a critical value of airfoil′s trailing edge thickness,when the trailing edge is thinker than the critical value,the lift and drag will be unsteady,otherwise when thinner than the critical value,they will be steady.
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