Numerical simulation of static and dynamic aerodynamics for flying wing with intake and exhaust effect

Based on the computational fluid dynamics (CFD) technique, a twodimensional model was adopted to carry out the simulation. A method to identify combined dynamic derivative was developed and testified with small amplitude oscillation, then three computational models: the model with intake and exhaust effect, the model with ventilating effect and traditional fairing model, were built, furthermore the stable and dynamic aerodynamics of the models was numerically simulated, and the dynamic derivatives were also calculated. Results and their analysis indicate that the method to obtain dynamic derivative is reliable, and compared with faring model, the stable stall angles of attack (AOAs) of the other two models are bigger with increasing lift, drag and pitching moment coefficients, however, the slopes of pitching moment coefficient are almost the same, showing there is no clear difference of static stabilities among the models. Moreover, the absolute value of dynamic derivative of intake and exhaust models is the largest for all the models at the same AOA, showing this model has the largest dynamic damping, the model with ventilating effect takes the second place and the fairing model has the minimum value.