Volume 7, 2023
|Number of page(s)
|26 May 2023
Technical & Applied Article
Conceptual estimation of the noise reduction potential of electrified aircraft engines★
German Aerospace Center (DLR), Institute of Electrified Aero Engines, Department Aeronautical Requirements and Environmental Impact, 03046 Cottbus, Germany
2 German Aerospace Center (DLR), Institute of Propulsion Technology, Engine Acoustics Department, 10623 Berlin, Germany
* Corresponding author: email@example.com
Accepted: 28 March 2023
The advent of electrified propulsion systems for civil aircraft promises not only notable reductions of CO2 and NOx emissions, but also of perceived noise. In an attempt to estimate the noise reduction potential of fully electric aircraft engines, the current study compares the noise generated by classical turboprop and turbofan engines with noise spectra calculated for electrified engines. The calculation is based on published far-field sound pressure level spectra at different noise certification points, which are then modified to account for the absence of combustion-related noise sources. In addition to the overall sound pressure level, changes to the effective perceived noise level are also taken into account. The results clearly show that the electrification of the engine alone will not lead to the notable noise reductions that are required in order to achieve the goals for future aviation set by the European Commission. Instead, continued research is necessary to further reduce noise sources that will continue to be present in novel electrified aircraft systems, such as fan noise and airframe noise.
Key words: Aircraft noise / Electrified aero engines / Electrification / Effective perceived noise level
Preliminary results of this study have been shown at the 48th German Acoustics Conference as paper number 476 
© The Author(s), published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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