Abstract
In this study, we investigated the influence of blade shapes on the aerodynamic noise characteristics of helicopter main rotors by the vortex method. The obtained results are the variation of the time-dependent lift coefficient of rotors and the aerodynamic noise characteristics of the helicopter rotor with different blade shapes. On that basis, the influence of the blade shape on the aerodynamic noise characteristics of helicopter rotors was evaluated. An advanced blade shape was designed to reduce the aerodynamic noise of rotors while maintaining the lift of the rotor. Computational results show that the rotor with the advanced blade generates the lower noise, and the noise of the advanced blade reduces by up to 6.15 dB (reduced by 6.90%) compared with the common rectangular blade in hover and up to 5.4 dB (reduced by 5.15%) in forward flight.
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