A predictive model of the drag coefficient fora revolving wing at low Reynolds number

摘要

A predictive model of the drag coefficient for a revolving wing at low Reynolds number is suggested. Unlike the previous model (Wang et al 2016 J. Fluid Mech. 800 688-719), the present model includes a viscous drag on the wing from laminar boundary layer theory and thus predicts the drag force more accurately at low angles of attack and low Reynolds numbers. Also, in determining the model constants, we consider the attack angle of pi/4 at which the resultant force on the wing is assumed to be perpendicular to the wing chord. The present aerodynamic model more accurately predicts drag forces of four different revolving wings than the existing ones.