The Aerodynamic Characteristics of Wing Root Widened of Two Sections Wing for Ground Effect Aircraft

In order to improve the carrying efficiency of the ground effect aircraft, a new type of two-segment wing layout ground effect aircraft is proposed based on the wing root widening and forward-swept design, and the aerodynamic characteristics of both wing root widening and straight wing aircraft are calculated in detail by FLUENT. The results show that the lift-drag ratio of the forward-swept straight wing aircraft is relatively larger during the high-altitude cruise state. The lift-drag ratio of the wing root widening aircraft is greatly improved compared with straight wing aircraft during ground effect flight, and the lift-drag ratio is up to 26.628 2. The ground effect can significantly increase lift coefficient, reduce drag and improve lift-drag ratio of the ground effect aircraft, and the relative increase of the lift coefficient of the wing root widening aircraft (up to 19.5%) and the relative decrease of the drag coefficient (maximum 29.1%), and relative increase of lift-drag ratio (up to 66.1%) are all higher than that of straight wing aircraft, indicating that the wing root widening enhances the ground effect. The pressure cloud diagram shows that the area and strength of the high-pressure region under the wing gradually increase when the flight altitude decreases, and in strong ground-effect regions (h=0.1c), the high-pressure area under the wing of wing-root widened aircraft can be extended to the tail section. The research results can provide a technical reference for the design of ground-effect aircraft.