Abstract
Rotor-stator interaction has been identified as the dominant noise source of a vertical take-off and landing (VTOL) aircraft developed by Entecho. This paper reports field measurement results of blade passing noise of the VTOL air-craft together with its analysis and control. The blade passing event was simulated in a wind tunnel experiment. The flow speed, rotor position, and rotor-stator spacing were varied with the chord-wise pressure distribution of the lead-ing surface of the rotor blade being measured by an array of six flush mounted microphones. Results show useful features of the pressure distribution on the rotor blade influenced by an upstream stator, which are used for the analysis and prediction of the sound radiation from the VTOL aircraft. The preliminary result of the reduction in the blade passing noise using angled stator blades is also presented.
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