Modeling the unsteady aerodynamic forces of a manevering rotor

摘要

The details of preicting the aerodynamic forces of maneuvering helicopter rotors are discussed in this paper. A new approach to modeling the unsteady rotor aerodyanmic forces is presetned based on the insight into nonuiform induced velocity distribution, inflow dynamics and unsteady airfoil behavior. For a specified maneuver, the totor control imputs and helicopter flight attitudes during the maneuvering are first obtained suing inverse solution technique, and then the unsteady totor forces are numerically simulated by synthetically applying the vortex theory, dynamic inflow theory and unsteady airfoil aerodynamic models. Good results of the sample calculations of lateral jink and pop-up maneuvers are obtained.