When the swept angle of the wing varies, the parameters such as the aspect ratio of the forward-swept wing aircraft and the relative speed of the cross-section airfoil relative to the incoming flow will change, which will play a great influence on the aerodynamic characteristics of the wing. Based on this purpose, this paper explores the impact of the oblique angle of the basic airfoil on the aerodynamic performances of the forward-swept wing. Firstly, the wing models of the upright and oblique basic airfoil were established, meanwhile the one-equation Spalart-Allmaras turbulence model and CFD technique were used for numerical simulation calculation. The change law of the aerodynamic characteristics of the wing with the fundamental airfoil upright and tilted are compared and analyzed when the swept angle varies.
Based on the variable forward-swept wing configuration, this paper utilizes a variable forward-swept wing mechanism with a double slideway, which makes it possible for the aircraft to switch among orthogonal wing, forward-swept wing and delta wing freely. The general configuration of the variable forward-swept wing mechanism with a double slideway is elucidated by means of a three-dimensional model plot and then the mathematic model is also established. The motion characteristics of linear motion are simulated, analyzed and optimized. The results indicate that the variable forward-swept wing mechanism with a double slideway can meet the aerodynamic requirements better. Moreover, there exists a larger moment amplification factor in forward-swept small Angle to provide greater control driving moment. Therefore, this mechanism may serve as a useful reference when developing a morphing aircraft.
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