The paper proposes a numerical method for simulating the noise of a open rotor, which allows us to combine a reasonable degree of accuracy in the estimation of aerodynamic noise with an acceptable speed of calculations. This is achieved by applying a simplified scheme for calculating the hydrodynamic problem using the vortex panel method and the simplified Ffowcs Williams-Hawkings method (explicit Farassat formulas) for calculating acoustics. The proposed approach can be used to determine the tonal noise of the rotor. It is characterized by ease of implementation, high speed of calculations, the possibility of taking into account the noise generated by the interaction of the vortex trail coming from the blades of the front rotor, with the blades of the rear rotor. This method is applicable for preliminary noise estimates at the design stage.
43.28.+h Aeroacoustics and atmospheric sound
43.28.Js Numerical models for outdoor propagation
$^1$Belgorod State Technological University named after V.G. Shoukhov\
$^2$V. N. Karazin Kharkiv National University
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