Coaxial Rotor Helicopter in Hover Based on Unstructured Dynamic Overset Grids

摘要

COAXIAL rotor configuration is one of the technologicalnsolutions for increasing helicopter forward speed, maneuver-nability, and load-carrying ability. Since two rotors produce the netnthrust instead of a single rotor in the conventional design, thendiameter of the rotors can be reduced to carry the same amount ofnweight. Themost attractive feature of a coaxial design is the resultingncompactness and safety of the vehicle. Second, the antitorsionalnmoment generated by the two rotors would be canceled due to thenopposite rotational directions, and the tail rotor and tail boom can beneliminated, resulting in a smaller and lighter vehicle.