ИСТИНА

The work is devoted to investigation of the non-classical transition to divergence in a three-dimensional problem through the modeling of a coupled wing motion in a non-separated flow. A three-dimensional unsteady flow of an ideal incompressible fluid around an elastic wing is considered. The method of discrete vortices is used to calculate the aerodynamic forces and moments. Beam equations of motion are solved to determine the wing shape under the action of the aerodynamic loads, with bending and torsion degrees of freedom taken into account. The wing parameters are chosen so that the wing divergence is observed when crossing critical flow velocity. We show that the divergence is not originated from the interaction of structural eigenmodes in both non-rotating and rotating wing cases, which confirms recent theoretical result. Possible applications are discussed.