Aerodynamic Forces of Elastically Oscillating Wings Calculated with CFD Methods.

Kurzfassung

In the following, the theoretical flow procedures that occur in the transonic speed range in modern commercial aircraft are researched. One main point is the calculation of periodic motion-induced forces in order to identify unwanted aerodynamic instabilities for an entire configuration as well as for individual components. A useful aerodynamic stability criterion can be derived from the power co- efficient. The influence of the friction of viscous flow is ignored.The theoretical results of selected standard wings are compared with available measurements. The starting point for a calculation is the spatial three-dimensionalEuler equations which are solved by an efficient upwind procedure in which time-dependent boundary conditions are observed. The goal is tointegrate the aerodynamic stability of the wing of future commercial aircraft at an early stage in the design. The requirement for this isa systematic study of the geometry and the elastic mode shapes of thewing and its influence on aerodynamic stability. Some examples are presented here.