几何尺度对GAW-1两段翼型升力特性的影响

在大型飞机和高速飞机的起降过程中增升装置空气动力性能的好坏对飞机有着举足轻重的影响。飞机增升装置通常采用多段翼型形式。在飞机设计阶段,一般是采用风洞实验的方法对多段翼型的气动性能进行评估。由于风洞的尺寸和动力所限,实验的模型和实验雷诺数都小于实际飞行情况。在数据的使用时,一般认为实验数据进行雷诺数修正即可。通过实验研究发现,即使雷诺数相同,几何尺度对两段翼型升力特性的影响也是非常显著的。建议在风洞实验中重视几何尺度对气动性能的影响。该研究结果和研究思路可供增升装置的设计和实验研究人员参考使用。

Geometric scale effect on lift of two-element GAW-1 airfoil

Modern commercial transport cruise speeds and wing loadings are much higher,consequently,a high-lift system is required to provide the additional lift necessary for low speed operation.Usually,multi-element airfoil is used for high-lift system.For the lack of accuracy of CFD,aerodynamics characteristics of multi-element airfoil must be tested in wind tunnel to make sure the design results.But wind tunnel experiment still has shortage,which is inadequate in Reynolds number and geometric scale.The author studied the high lift two-element airfoil GAW-1 with 29% flap in NF-3 wind tunnel and provided three research results as follows:(1) If the lift coefficients of different slat width are the same,slat is deduced with Reynolds number increasing;(2) If the slat width contains,the lift coefficient is increasing with Reynolds number;(3) Geometric scale is one of the key parameters for the maximum lift coefficient of multi-element airfoil.The method and ideal adopted in this report is believed to be useful to other researches about multielement airfoil.