Evaluation of Isolated Fuselage and Rotor-Fuselage Interaction Using Computational Fluid Dynamics

摘要

The U.S. Army Aeroflightdynamics Directorate (AFDD), the French Office National d'Etudes et de Recherches Aerospatiales (ONERA), and the Georgia Institute of Technology (GIT), through the United States/France Memorandum of Agreement on Helicopter Aeromechanics, have performed a comparative study of the Dauphin 365N helicopter to analyze the capabilities and weaknesses of state-of-the-art computational fluid dynamics (CFD) codes, with the aim of fuselage performance prediction and initial investigation of rotor-fuselage interaction. Three Reynolds-averaged Navier-Stokes (RANS) flow solvers were evaluated. While force predictions between solvers are fairly equivalent, there exists a discrepancy between the computed forces and the experimental data, partially attributable to geometry model inaccuracies, grid resolution, and possibly turbulence modeling. Details on the grid sensitivity, model geometry sensitivity, and the influence of low Mach number preconditioning are discussed. Rotor-fuselage interactions are performed using uniform and nonuniform actuator disk models to simulate the rotor downwash.