Effects of
Simulated-Spanwise-Ice Shapes on Airfoils: Experimental
Investigation
S. Lee and M.B. Bragg
University of Illinois, Urbana, Illinois 61801
ABSTRACT
An experimental investigation was conducted to determine the effect of
simulated-spanwise-ice shapes on airfoil aerodynamics. The simulated ice shapes were tested on the NACA 23012 and the NLF 0414 airfoils at Re = 1.8
million. The ice shapes produced very different results on the two
airfoils. The effects of the simulated ice shapes were much more severe
on the NACA 23012, with a Cl,max as low as 0.25 for the ice shape with
a height to chord ratio of 0.0139. The lowest Cl,max measured for the NLF
0414 with same ice shape was 0.68. The effect of the simulated ice shape
on the flap hinge moment was much more severe on the NACA 23012 than on
the NLF 0414. The NACA 23012 effects were more severe due to the large
adverse pressure gradients at the ice-shape location. Various simulated
ice shape size and geometries were investigated on the NACA 23012. The
aerodynamic penalties (in
Cl,
Cd,
Cm, and
Ch) became more severe as the
height to chord ratio of the simulated ice shape was increased from
0.0056 to 0.0139. The variations in the simulated ice shape
geometry also had measurable effects on the airfoil aerodynamics.