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中文摘要：
本文通过数值模拟,研究了S809翼型表面沿切向顺时针方向速度运动时的气动性能.从计算结果看出,翼型表面运动能有效抑制或延缓大攻角流动分离,改善翼型的气动性能。在此基础上,为了仅考虑表面的运动效应,消除翼型几何外形对升阻力系数的影响,本文还研究了皮带轮翼型（由大小两个圆柱驱动的皮带轮）的气动特性。计算结果进一步表明,表面运动能有效地抑制翼型吸力面发生大规模流动分离,并可极大地增加翼型升力系数。
英文摘要：
The aerodynamic performance of the S809 airfoil with surface moving in clockwise like a moving belt is investigated numerically.The results show the method of moving surface is efficient to increase lift and prevent or delay the separation of boundary layer.In order to eliminate the effect of the special airfoil geometry and take moving surface as the main control factor,a simple airfoil like belt pulley which is a belt driven by two cylinders is also concerned with surface moving.From the results,moving surface is proved to be efficient in suppressing the big separation in the suction side of the airfoil and its lift coefficient can be increased dramatically.
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