Effects of Dynamic Stall and Structural Modeling on Aeroelastic Stability ofElastic Bending and Torsion of Hingeless Rotor Blades with Experimental Correlation

摘要

The effects of blade and root-flexure elasticity and dynamic stall on aeroelasticstability of hingeless rotor blades are investigated. The dynamic stall description is based on the ONERA models of lift, drag and pitching moment. The structural analysis is based on three blade models that range from a rigid flap-lag model to two elastic flap-lag-torsion models, which differ in representing root-flexure elasticity. The predictions are correlated with the measured lag damping of two experimental isolated rotors: a two-blade rotor in hover and a three-blade rotor in hover and forward flight. The operating conditions range from near-zero thrust in hover to highly stalled, high-thrust conditions in forward flight.