Influence of Blade Rotation on the Sectional Aerodynamics of Rotational Blades

摘要

It is known that due to rotation of the blade, lift coefficients on inboard211u001esections may exceed the 2-D maximum lift coefficient. A model to take into 211u001eaccount was suggested by Snel (25). The model is further analyzed and implemented 211u001ein a 2-D viscous-inviscid interaction code, with a panel method for the inviscid 211u001eflow, and an integral method for the boundary layer. Calculated pressure 211u001edistributions and lift coefficients are compared with experimental data and with 211u001ethe previously obtained results using a different 2-D flow solver. The two codes 211u001ecapture the effects of blade rotation, but overpredict the increase in lift. The 211u001eeffect of Reynolds number and rotation speed is discussed, as well as the 211u001einfluence of transition on lift, drag and moment coefficient. Calculations are 211u001epresented showing the influence of blade rotation on a pitching airfoil in light 211u001estall.