Influence of Tip Store Mass Location on Wing Limit-Cycle Oscillation

Abstract

1of 15 Aeroelastic analyses of a wing/tip-store configuration are performed using a computational methodology that couples transonic small-disturbance theory and an interactive boundary layer approach. Flutter and limitcycle oscillation responses are computed and compared with solutions obtained for three locations of tip store mass. Unmatched and matched analyses are performed to find limit-cycle oscillations at different Mach numbers and altitudes. For some of the configurations considered, non-unique states of limit-cycle oscillation are observed over certain parameter ranges. Generally, the presence of viscosity increases the onset speed of limit-cycle oscillation and quenches oscillation growth, so that their amplitude becomes insensitive or decays with further increase in flight speed. The quenching mechanism is found to be separation of the boundary layer at the trailing edge of the wing. However, in a limited number of cases, the presence of viscosity is found to lead to increased amplitudes of limit-cycle oscillation. NOMENCLATURE