Unsteady aerodynamic forces and aeroelastic response for external store of an aircraft

An experimental identification investigation of unsteady and stall aerodynamic coefficients for an external store of an aircraft has been made. The coefficient identification is performed by a least-squares procedure based on the measured time series obtained from an aeroelastic model undergoing aerodynamic excitation caused by a gust generator. The results are verified by the good correlation between the theoretical prediction and aerodynamic measurement data. Using the identified unsteady aerodynamic model, numerical investigations for both the stability (flutter) and nonlinear aeroelastic response of this external store model have been made. Also, the results were compared with those obtained from a quasisteady aerodynamic model. It is seen that the effects of unsteady aerodynamics on the nonlinear aeroelastic response are significant when the angle of attack is large.

Duke Scholars

Author Earl H. Dowell Thomas Lord Department of Mechanical Engineering and Materia ...