湍流度和雷诺数对附面层转捩位置的影响

对于层流翼型模型（翼弦长300mm），当湍流度小于0.1％时，对附面层转捩点位置没有明显影响，但其大于0．1％以后则影响明显；而对NACA0024对称翼型（弦长400mm）模型，其表面附面层转捩点位置不受湍流度的影响。对于两个不同尺寸的层流翼型模型（弦长分别为300mm和800mm）而言，当雷诺数大于某一位后转按点位置才受雷诺数的影响，对于NACA0024对称翼型模型，其表面阻面层的转捩点位置也不受雷诺数影响，且转捩点位置与变湍流度情况下在同一位置上。

EFFECT OF TURBULIVITY AND REYNOLDS NUMBER ON BOUNDARY LAYER TRANSITION POSITION

This paper presents the effect of free stream turbulivity and Reynolds number on boundary layer transition position by experimental research. Experimental results shown that for laminar airfoil model (cord is 300mm) as the turbalivity was less than 0.1% the effect of the turbulivity on boundary layer transition point position was not clear. After the turbulivity was larger than 0.1% the effect was clear. For NACA0024 symmetrical airfoil model (chord is 400mm) the turbulivity had no effect on boundary layer transition point position of the model surface. For the laminar airfoil models of two different size (chord is 300mm and 800mm respectively),Reynolds number had no effect on the transition point position until it was larger than some value. For NACA0024 symmetrical airfoil model Reynolds number had no effect on boundary layer transition point position of the model surface,and The transition point position was just the same with the condition of variant turbulivity.