Lift-induced drag of a cambered wing for Re ≤ 1 × 106

An investigation of the dependence of the lift-induced drag coefficient C _Di of a square-tipped, cambered wing model on Reynolds number for Re ≤ 1 × 10⁶ was conducted. Computed based on the vorticity distribution inferred from the near-field cross-flow velocity measurements of the tip vortex, different C _Di prediction schemes were used. The effect of measurement plane size and grid resolution on the C _Di calculations was also identified. The C _Di estimated by the integral method was found to increase with increasing Re and was below the C _Di = C _l²/πeAR prediction. Limits on the measurement plane size and grid resolution were determined to be at least 40% larger than the vortex outside diameter and no larger than 0.63% chord, respectively, in order to provide a good estimate of the induced drag.