DLM-Correction Method for Aerodynamic Gust Response Prediction

Kurzfassung

In this paper, aerodynamic gust responses are presented which are calculated using the DLM-correction method iSKEM [1]. iSKEM uses quasi-steady CFD data in order to enhance the DLM-based results. Comparisons between DLM, CFD and iSKEM for a rigid 3D swept wing show that the steady-state properties of the flowfield, such as separation and recompression-shocks, should always be taken into account. Quasi-steady corrections are only sufficient in the linear range of the steady lift polar and only for small gust amplitudes. In case of high angles of attack, i.e. with flow separation, steady corrections are not sufficient. Moreover, for high gust amplitudes even at low angles of attack linear methods will not be able to calculate the actually occurring load peaks.