The theoretical model of predicting airfoil aerodynamic characteristics was established which then was numerical calculated Effects of airfoil thickness on airfoil aerodynamic characteristics were studied. Effect laws of airfoil thickness on lift coefficient , drag coefficient, lift - drag ratio and flow field around airfoil, pressure coefficient were given. The results show that, the effect of airfoil thickness is obvious to the aerodynamic characteristics. At small angle of attack range, the airfoil of smaller thickness leads to the larger lift - drag ratio. At larger angle of attack range, increasing airfoil thickness can improve lift - drag ratio and extend large lift - drag ratio range. Also the separation point of thicker airfoil moves forward slower and the range of vortex distribution is smaller.%建立了预测翼型气动特性的理论模型并进行了数值计算,研究了翼型厚度对风力机叶片翼型的气动特性影响,给出了翼型厚度对翼型的升力系数、阻力系数、升阻比和流场、压力系数的影响.研究结果表明,对于同一弯度不同厚度的NACA系列翼型,在较小攻角时,较小厚度翼型可获得较大的升阻比,在大攻角时,增加厚度翼型可以提高翼型的升阻比,扩宽大升阻比范围,而且较大厚度翼型的分离点前移速度较缓慢,涡分布范围较小.
展开▼
