Study on the Influence of Swept Angle on the Aerodynamic Characteristics of the Cross-Section Airfoil of a Variable Swept-Wing Aircraft

Abstract The variable forward swept-wing aircraft is a typical variant aircraft. The airfoil is a variable airfoil during the wing swept, and its aerodynamic characteristics have a huge impact on the flight performance of the variable swept-wing aircraft. It is also an aircraft. One of the difficult problems to be solved first in aerodynamic layout design. In order to explore the unsteady aerodynamic characteristics of the variable airfoil, a variable airfoil model with different relative thicknesses is established. Then the S-A turbulence model is used and the CFD simulation is used to calculate the variable airfoil unsteady. The variation of the angle of attack and the Mach number when the aerodynamic parameters change in the forward sweep angle. The results show that the airfoil lift coefficient and moment coefficient are negatively correlated with the relative thickness, while the drag coefficient is positively correlated with the relative thickness. These aerodynamic characteristics can provide a useful reference for the aerodynamic layout design and dynamic analysis of the variant aircraft.