Aeroacoustic characteristics of distributed electric propulsion system in forward flight

Research output: Contribution to conferenceConference Paper

Abstract

This study presents a detailed experimental investigation of the aerodynamic and aeroacoustic characteristics of distributed electric propulsion configurations in forward flight, with a focus on the effect of the blade tip separation distance between the propeller blades. Two identical 5-bladed propellers with a diameter of D = 9” and P/D = 1 were mounted on a NACA0024 wing, such that the wake from the propellers impinged directly on the wing. The effects of the blade tip separation distance were investigated while maintaining a constant rotational speed of 8000 rotations per minute. Measurements were acquired at fine increments of wind tunnel speeds ranging from 8 m/s to 24 m/s corresponding to various advance ratios. The spectra and directivity of the far-field noise were studied in detail for both broadband and tonal components. The results indicate that the thrust produced by the propellers was not sensitive to the blade tip separation distance. Far-field measurements indicate that the advance ratio had a significant impact on noise radiation. Changing the tip-to-tip distance was found to alter the tonal noise at the blade passing frequency and its sub-harmonics, contributing to variations in the directivity of the overall sound pressure level over the tested range of advance ratios. The findings from this study contribute to a better understanding of the aeroacoustic characteristics of distributed electric propulsion configurations in forward flight and new technique to reduce noise from such systems.
Original languageEnglish
DOIs
Publication statusPublished - 13 Jun 2023

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