An Experimental Study of the Aeroacoustic Properties of a Propeller in Energy Harvesting Configuration

The aim of the present manuscript is to investigate noise footprint an isolated propeller in different flight configurations for propulsion a hybrid-electric aircraft. Experimental tests were performed at Low-Turbulence Tunnel located Delft University Technology with powered model and flush-mounted microphones tunnel floor. was investigated advance ratios order study impact propulsive energy harvesting configurations. For brevity, this work only reports results conditions maximum efficiency both regimes, fixed blade pitch setting. Comparing these two configurations, frequency-domain analysis reveals significant modification nature source. In configuration, most related tonal component, as expected propeller; however, broadband component increases significantly compared mode. A more detailed requires separation components and, purpose, innovative decomposition strategy based on proper orthogonal (POD) has been defined. This novel technique shows promising results; time Fourier domains reconstructed perfectly describe original signal no phase delays or other mathematical artifices are introduced. sense, it can represent very powerful tool identify sources same time, define control aimed mitigation.