Abstract
In recent years, drone has been utilized in various applications including industrial use. On the other hand, when a drone is to be flying in an area where noise is a problem, such as a residential area, the aerodynamic noise generated by the rotation of the propeller becomes a problem, so it is urgent to take measures to silence the drones in the flight state. Therefore, in this study, the silent design of the propeller was carried out based on the flow distribution of the drones by the propeller rotation and the pressure distribution of the propeller surface obtained from the numerical fluid analysis (CFD). Furthermore, the noise level was evaluated by using acoustic measurement and acoustic analogy method, and quietness of about 2 dB was achieved before and after noise reduction measures.
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