A comprehensive aeroelastic analysis of helicopter rotor with advanced tips based on finite element theory in space and time is coupled with an efficient rotor wake modeling. The effects of different wake models and t...A comprehensive aeroelastic analysis of helicopter rotor with advanced tips based on finite element theory in space and time is coupled with an efficient rotor wake modeling. The effects of different wake models and tip sweep angles on blade response and loads are investigated in forward flight. Each blade is assumed to undergo flap bending, lag bending and elastic twist deflections. The blade response is calculated from nonlinear periodic equations using a finite element in time scheme. For induced inflow distributions on the rotor disk, a constant vorticity contour wake model is used. Results show that blade response and loads are sensitive to wake model and tip sweep angle, and the rotor wake analysis is important for capturing the harmonics of vertical hub loads, flap bending moments and low speed aerodynamic loadings.展开更多
文摘A comprehensive aeroelastic analysis of helicopter rotor with advanced tips based on finite element theory in space and time is coupled with an efficient rotor wake modeling. The effects of different wake models and tip sweep angles on blade response and loads are investigated in forward flight. Each blade is assumed to undergo flap bending, lag bending and elastic twist deflections. The blade response is calculated from nonlinear periodic equations using a finite element in time scheme. For induced inflow distributions on the rotor disk, a constant vorticity contour wake model is used. Results show that blade response and loads are sensitive to wake model and tip sweep angle, and the rotor wake analysis is important for capturing the harmonics of vertical hub loads, flap bending moments and low speed aerodynamic loadings.
