NACA0012翼型跨声速强迫运动非定常气动力模型

It is unsuitable to model unsteady aerodynamics for high-agility modern aircraft by the traditional first-order linear superposition theory. For this study, in order to investigate the applicability of a higher order aerodynamic model to the simulation of hysteresis effects, the unsteady time histories of aerodynamics for NACA0012 associated with single-freedom forced motions, plunging and pitching, and coupled plunging and pitching motion under transonic conditions were investigated computationally based on in-house codes. The effects of various aerodynamic derivatives on aerodynamic models are discussed based on the Etkin aerodynamic model. Final results indicated that unsteady lift and pitching moment in forced single or coupled motions could be accurately regenerated if the Etkin model is expanded to the second order derivative of the angle of attack with respect to time.