Abstract:
Flow fields and aerodynamic interaction phenomenon between rotors and wings are simulated for a tilt rotor model in hover state by solving the unsteady Navier-Stokes equations on embedded grid system. Adaptive Cartesian grid is adopted as background grid, aiming at capturing the large scale vortex and other flow details with advanced accuracy. Eddy viscosity is estimated by the Spalart-Allmaras detached eddy simulations, and flow fields and aerodynamics data are calculated and compared with the corresponding Reynolds averaged Navier-Stokes(RANS) ones. The differences in the results are analyzed and evaluated. It is shown that the flow separation under the wing is described with high precision by the DES method. The blade undergoes intensive lift variation when it passes the region above the wing, and the download of the wing is 2.3% less than the RANS result.