Elastic Torsion Effects on Helicopter Rotor Loading in Forward Flight

摘要

An unsteady aerodynamic analytical model has been presented and verified for rotating wings in forward flight. Of particular interest, an improvement has been done by adding experimental elastic torsion as an input to the local angle of attack. The direct effect of adding elastic torsion is presented in the local relative angle of attack which in turn affects the aerodynamic loading. The local aerodynamic loads with elastic torsion showed better agreements with the experimental results for 7A rotor high speed test point. A physical contribution for the existed differences between the analytical and experimental results is referenced and explained.