CFD 및 강체 동역학을 이용한 항공기의 결빙 궤적 예측

Abstract

Ice shedding refers to the phenomenon that ice forms on the surface of an aircraft operating in icing conditions and then moves with the flow after break-up from the surface by aerodynamic forces. Collisions of shed ice fragments with aircraft components such as engine intake or control surface can cause serious threat to the safety of aircraft. The separated ice fragments show unpredictable and complex characteristics in their shape, size, orientation, formation position, and rotational speed. This study deals with the prediction of the trajectories of ice fragments using computational simulation methods. The trajectories of ice fragments of a fixed wing aircraft were calculated by the CFD code based on the overset grid method and the formulation of six degree of freedom. The method was first validated for the flat plate motion using the wind tunnel test results. Finally, the aerodynamic characteristics and trajectories of separated ices were investigated for various ice shapes and conditions.