Pitch-Flap Stability of a Centrally Hinged Rigid Rotor Blade

摘要

The pitch-flap stability of a centrally hinged rigid rotor blade rotating in still air is investigated. Quasi-steady strip theory is used to obtain the aerodynamic loads. The aerodynamic loads are compared with aerodynamic loads from the literature. The influence on the stability boundary of effective camber terms and angle of attack terms is investigated. It is concluded that the aerodynamic loads must be modeled carefully; it is inadequate to neglect terms of common chord-rotor radius ratio order.