Transactions of Nanjing University of Aeronautics & Astronautics
Numerical Calculations of Aerodynamic and Acoustic Characteristics for Scissor Tail-Rotor in Forward Flight
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Abstract:
The aerodynamic and aeroacoustic characteristics of a scissor tail-rotor in a forward flight are numerically calculated. A novel computational fluid dynamics (CFD) model based on Navier-Stokes (N-S) equations is presented to simulate the unsteady flowfield and the aerodynamic characteristics of a scissor tail-rotor in the forward flight. Then the Farassat Formulation 1A derived from the FW-H equation is coupled into the CFD model in order to compute the aeroacoustic characteristics of the scissor tail-rotor. In addition, two different scissor tail-rotor configurations, i.e., the L- and U-configuration, are analyzed in details and compared with a conventional one. The influence of scissor angles on the aerodynamic and aeroacoustic characteristics of the scissor tail-rotor is also investigated. The simulation results demonstrate that the flowfield, aerodynamic force and aeroacoustic characteristics of a scissor tail-rotor are significantly different from the conventional one, and the aerodynamic interaction decreases with the increase of scissor angle, which leads to a reduction of amplitude variation of the tail-rotor thrust in the forward flight. The scissor angle has an important effect on the aerodynamics and aeroacoustics of the scissor tail-rotor.
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