Analysis of Thrust-Scaled Acoustic Emissions of Aircraft Propellers and Their Dependence on Propulsive Efficiency

Xin Geng, Tianxiang Hu, Peiqing Liu, T. Sinnige, G. Eitelberg

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientific

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Abstract

The increasing demand for short-range passenger air transport and the strong push for aircraft with electric propulsion has renewed research interest in propellers. Despite the unmatched aerodynamic efficiency of propellers, their relatively high noise emissions limit widespread application on aircraft. Previous research has not systematically addressed the tradeoff between aerodynamic and aeroacoustic performance. This paper presents the results of an optimization study aimed at minimizing propeller noise without compromising aerodynamic efficiency. In the optimization, a blade-element-momentum-theory (BEMT) model is utilized which accounts for the effects of blade sweep on the blade loading. This BEMT model is coupled to a frequency-domain code for tonal noise prediction. A novel scaling approach is presented to directly relate the propeller noise emissions to the propeller thrust. Dedicated wind-tunnel experiments were performed to validate the analysis models. Good agreement between numerical and experimental results is obtained at low to moderate blade loading conditions. The optimization study shows that the blade sweep is an important design parameter to simultaneously maximize aerodynamic and acoustic performance. Compared to a modern baseline design, a noise reduction of 2.9 dB is achieved without reduction in propeller efficiency.
Original languageEnglish
Title of host publication32nd Congress of the International Council of the Aeronautical Sciences
PublisherInternational Council of the Aeronautical Sciences
Number of pages18
Publication statusAccepted/In press - 2021
Event32nd Congress of the International Council of the Aeronautical Sciences - Shanghai, China
Duration: 6 Sep 202110 Sep 2021

Publication series

NameICAS 2021

Conference

Conference32nd Congress of the International Council of the Aeronautical Sciences
Abbreviated titleICAS 2021
CountryChina
CityShanghai
Period6/09/2110/09/21

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