Rotor/wing aerodynamic interaction is considered one of the key technology issues for compound helicopter design. Understanding of the influence on the rotor and the wing aerodynamic characteristics by the aerodynamic interaction is significantly important. This paper describes about the investigation of rotor/wing interaction through a numerical simulation using a rotorcraft CFD solver, rFlow3D, developed at JAXA. A simplified computational model with a rotor and a wing is considered. A rectangular wing model is added to the UH-60A helicopter with the wing size for the original maximum takeoff weight. To investigate the influence of rotor/wing aerodynamic interaction, the isolated rotor and the isolated wing configurations are firstly simulated and then compared to the rotor/wing combined configuration. Two flight conditions at the cruising speed and at the maximum speed are computed. The rotor speed is reduced to 75% RPM at high speed flight condition. The numerical simulation result indicates that the total effective drag of the rotor/wing configuration is increased than the simple summation of the isolated models. The wing lift is reduced by rotor/wing aerodynamic interaction, and the required rotor thrust is increased to keep the same total lift. The sectional normal force on the wing has an asymmetric distribution. The sectional lift is significantly reduced and the sectional drag is increased on the wing side below the rotor advancing side. On the wing side below the blade retreating side, the rotor has much slight effects on the sectional lift and drag on the wing.
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