Numerical simulation of the aerodynamic characteristics of a fixed wing with trailing edge rotating slotted cylinder

A new type of flutter exciter is simplified as a two dimensional lifting surface with a slotted rotating cylinder at its trailing edge. The excitation characteristics are studied by examining its static and dynamic aerodynamic characteristics using CFD approach. The lifts of the airfoil which vary with the variation of rotating phase angles of the cylinder are calculated at different angles of attack and airflow velocities. The abrupt change of lift under static conditions at phase angle of 45°±3° and 135°±3° is also examined and explained. It is found that the amplitude of the lift decreases monotonically with the distance between the trailing edge of the airfoil and the leading edge of the cylinder increasing. The numerical simulation results for the unsteady aerodynamics demonstrate that it can generate a sine wave exciting force when the cylinder is rotating at a constant rate.