Investigating the Effects of Multi Aerofoil Wing on the Aerodynamic Characteristics

In this study, the strategy of the multi-airfoil wing was used to improve the aerodynamic properties by increasing the lift force and decreasing the drag force. Four airfoils of Boeing 737 were chosen (b737a-il, b737b-il, b737c-il, and b737d-il) to design three types of aircraft wing models depending on these airfoils. Furthermore, these models were built by using three airfoils in each wing to design the wing parts (root, midspan, and tip) and calculate the lift and drag force under the various values of attack angle ($0^{\circ},\ 5^{\circ}$, 10°, and 15°). Besides, the value of L/D was calculated to prove which wing has a high value of lift and a low drag. All models of a wing were designed in a 3D format using the SOLIDWORKS program. The model of a wing was analyzed using ANSYS FLUENT. The numerical results manifested that the maximum lift-to-drag ratio (L/D) value is equal to 25.84 at an angle of 5° with a minimum value of 9.4 at an angle of 15°. The large difference between the two values (percentage difference =93%) proves when the sequence of airfoil arrangement in the wing varies, the L/D ratio changes also.