EXPERIMENTAL STUDIES OF THE SMALL-SCALE ROTORS NOISE
The paper shows the results of the experimental study of rotor noise. The research was performed in a noise-attenuated chamber. Rotors of F7/A7 design were printed on a 3D printer. The rotors were investigated at speeds up to 10000 rpm. The model rotors are up to 0.16 m in diameter. Noise registration of the isolated rotors showed the presence of a tonal and broadband noise component. Noise of coaxial counter-rotating open rotors is dominated by a broadband component. The contribution of the noise characteristics of commutator-less electric motors used in the experiments to the broadband noise of rotors is shown. The contribution of experimental commutatorless motors to the rotor noise characteristic is determined.