Experimental Study of Icing and Anti-Icing for Pitching Airfoil

The icing on rotors poses a significant threat to flight safety. Unlike static components, the motion of rotor blades is complex, making it challenging to study. To investigate rotor icing and provide technical support for anti-icing design, a wing pitch oscillation mechanism was installed in an icing wind tunnel. This mechanism simulated the periodic pitching motion of the rotating rotor airfoil. Through pre-experimental calibration, an appropriate heating power was determined to achieve an incomplete ice protection state with visible residual ice on both stationary and moving wings. The distribution range of this residual ice was studied to compare the anti-icing effectiveness under different conditions. The results revealed that the influence of different pitching frequencies on the coverage range of residual ice during the anti-icing tests was minimal. However, within a certain narrow frequency range (approximately 4–5 Hz), a sudden decrease in the coverage range of residual ice occurred, resembling the “resonance” phenomenon observed in certain mechanical systems.