论文部分内容阅读
采用Spalart-Allmaras湍流模型研究风力机专用翼型DU00-W-212的气动性能。在雷诺数小范围变化的情况下,应用数值模拟的方法对粗糙翼型和光滑翼型的气动特性进行对比。探讨雷诺数小范围变化对粗糙翼型气动特性的影响,并分析升阻力的变化机理。比较升阻力曲线,发现粗糙度对升力系数影响最大的区域在迎角10°附近。小迎角的情况下,前缘粗糙度会使得翼型的升力系数下降,阻力系数反而上升。在大迎角失速的情况下,粗糙翼型的阻力系数反而小于光滑翼型的阻力系数。为了增加叶片适应恶劣沙尘环境的能力,在叶片设计和翼型排布的过程中应该尽量避开升力系数最大的迎角处。
Spalart-Allmaras turbulence model was used to study the aerodynamic performance of airfoil DU00-W-212. The aerodynamic characteristics of rough airfoil and smooth airfoil are compared by using numerical simulation when the Reynolds number is small. The influence of the small range of Reynolds number on the aerodynamic characteristics of rough airfoil is discussed, and the mechanism of change in lift resistance is analyzed. Compared with the rise resistance curve, it is found that the area where the roughness has the most influence on the lift coefficient is around 10 ° angle of attack. Small angle of attack, the leading edge roughness will make the airfoil lift coefficient decreased, drag coefficient instead of rising. In the case of a stall at a high angle of attack, the drag coefficient of a rough airfoil is less than the drag coefficient of a smooth airfoil. In order to increase the ability of the blade to adapt to the harsh dust environment, the maximum angle of attack should be avoided during the blade design and airfoil arrangement.