Abstract
In order to suppress the near field aeroacoustics radiation on the fuselage wall of the tilt-rotor aircraft, a noise suppression method is proposed based on the rotor phase control. Firstly, based on the free wake model and panel method, a tilt-rotor near field aeroacoustics calculation model is established considering the interference between the rotors and the wing. Then, taking the XV-15 tilt-rotor aircraft as object, a simulation research is carried out in both hover and cruise conditions, and the influence of the rotor phase difference (RPD) on the near field aeroacoustics radiation is studied. The results show that the Overall Sound Pressure Level (OASPL) of aeroacoustics radiation on the fuselage wall can be effectively reduced by the rotor phase control, but the introduction of RPD will also aggravate the aerodynamic interference between the rotors, and have some negative impact on the noise suppression effect. In hover condition, the aerodynamic interference is most serious, and the noise suppression effect of the rotor phase control is relatively poor. In cruise condition, because of the distant inflow, the interference between the rotors and wing is relieved, and the rotor phase control can achieve better noise suppression effect. The OASPL of aeroacoustics radiation on the fuselage wall can be reduced by 10.2 dB at most in hover condition, and up to 15 dB in cruise condition. The simulation results demonstrated a significant effect of rotor phase control on near field aeroacoustics suppression of tilt-rotor aircraft.
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