유인드론용 생체모방 동축반전 프로펠러의 소음 분석에 관한 연구

초록

This paper deals with the results of the noise analysis of counter-rotating propellers for a manned drone, the airfoils of which are the outcomes from previous bio-mimetic wing design. The counter-rotating propellers are purposedly-designed to provide the higher thrust force with the lesser noise level for passengers’ convenience than those of unmanned drones. The measured thrust force coefficients are compared with the results of steady-state simulations by using Ansys CFX 19.0 software. Starting with the steady simulation results as initial conditions, an unsteady-state analysis is performed to get unsteady-nature, physical variables on the propeller surfaces in the domain of time. By using the FW-H equation implemented in Matlab software, the aero-acoustic signatures at far-fields are predicted in terms of the polar coordinate system. Based on the computed sound pressure levels at the specific observation locations, the noise downstream of the counter-rotating propellers is observed to have more contributions by the downstream propeller than the upstream one due to the interaction effect.

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