ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Improvement mechanism of ice-tolerance capacity for iced airfoil with variable camber of drooping leading edge
Received date: 2022-03-07
Revised date: 2022-03-21
Accepted date: 2022-04-11
Online published: 2022-05-09
Supported by
National Science and Technology Project
Traditional aerodynamic optimization method of ice-tolerance encounters difficulties in completely taking into account the contradictory requirements of the conventional flight and icing state for airfoil geometric characteristics. Based on the idea of the variable camber in drooping the leading edge， we propose a new solution to the coordination and decoupling of the aerodynamic and ice-tolerance performance of airfoils. The numerical simulation of post-stall separation of the GLC305-944 iced airfoil before and after drooping the leading edge is conducted with the Improved Delayed Detached Eddy Simulation （IDDES） method. The results show that the stall performance of the iced airfoil is significantly improved after drooping the leading edge， and the suction of the leading edge is recovered in the form of pressure plateau. The structure of the separation bubble is degraded from a global large-scale recirculation region to a local flow structure after the horn while the influence of turbulence fluctuation is controlled in the limited region near the leading edge. Since the horn ice and the local wall form a special cavity structure after the leading edge drooping， both the mixing effect and the momentum transport will be directly induced near the wall after a short development process of the shear-layer vortices， thus the reattachment is effectively promoted. Therefore， the time-average reattachment point is shifted forward and the thickness of the mixing layer is reduced， forming a separation bubble structure with a limited scale. This is the basic mechanism for the improvement of ice-tolerance capacity.
Heng ZHANG , Jie LI , Binbin ZHAO . Improvement mechanism of ice-tolerance capacity for iced airfoil with variable camber of drooping leading edge[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(1) : 627114 -627114 . DOI: 10.7527/S1000-6893.2022.27114
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