Session EN - Aerodynamics.
ORAL session, Monday morning, November 19
Manchester 1, Marriott Hotel and Marina San Diego
Experimental measurements of wing downwash induced on an aft tail by the main wing of an airplane are compared to a modified lifting-line theory to verify its prediction accuracy. The modified theory extends Prandtl’s classical lifting-line theory to provide a closed-form solution that can account for several 3-dimentional effects such as arbitrary wing planform and the relative position of different lifting surfaces. Velocity measurements downstream of a rectangular planform NACA 0015 wing are obtained using an x-type hot wire probe. From these measurement wing circulation versus angle-of-attack and downwash as a function of vertical and downstream position is determined. These parameters allow a tail position correction factor to be calculated which is then compared to the correction value predicted from the modified theory.