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Mechanisms to reduce the blade passing frequency tone for subsonic low-count OGV fans

Schade, Stephen and Jaron, Robert and Moreau, Antoine and Guerin, Sebastien (2021) Mechanisms to reduce the blade passing frequency tone for subsonic low-count OGV fans. Aerospace Science and Technology (125). Elsevier. doi: 10.1016/j.ast.2021.107083. ISSN 1270-9638.

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Official URL: https://www.sciencedirect.com/science/article/pii/S1270963821005939

Abstract

Conventionally, fan stages are designed with more stator vanes than rotor blades. These fan stages provide a tonal noise advantage as the blade passing frequency tone is cut-off. Contrary to conventional cut-off designs, low-count OGV (Outlet Guide Vane) designs are fan stages with fewer stator vanes than rotor blades. Low-count OGV designs benefit from lower broadband noise due to the reduced number of stator vanes. However, the blade passing frequency tone may no longer be cut-off. Therefore, we assess tonal noise reduction mechanisms for subsonic low-count OGV fan stages. We use an analytical and a numerical method to predict the rotor-stator interaction noise for different blade count pairings. The results indicate that the mode phase propagation angle and the cut-on factor are two acoustic parameters that dominantly influence the noise excitation. For certain blade count pairings an acoustic benefit exists if the mode phase propagation angle is congruent to the stator leading edge angle and / or if the mode is away from the cut-off limit. Moreover, reducing the rotor tip speed allows, for some configurations, a cut-off design even with fewer stator vanes than rotor blades (inverse cut-off). Overall, the study shows promising possibilities to reduce tonal interaction noise for low-count OGV fan stages.

Item URL in elib:https://elib.dlr.de/144155/
Document Type:Article
Title:Mechanisms to reduce the blade passing frequency tone for subsonic low-count OGV fans
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schade, StephenStephen.Schade (at) dlr.dehttps://orcid.org/0000-0002-6381-0284
Jaron, RobertRobert.Jaron (at) dlr.deUNSPECIFIED
Moreau, Antoineantoine.moreau (at) dlr.deUNSPECIFIED
Guerin, SebastienSebastien.Guerin (at) dlr.deUNSPECIFIED
Date:1 September 2021
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.ast.2021.107083
Publisher:Elsevier
Series Name:SI: DICUAM 2021
ISSN:1270-9638
Status:Published
Keywords:Fan noise, Low-count OGV fans, Design-to-noise, Tonal noise reduction, Inverse cut-off, Urban air mobility
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Future Engines and Engine Integration
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology
Institute of Propulsion Technology > Engine Acoustic
Deposited By: Schade, Stephen
Deposited On:27 Sep 2021 08:43
Last Modified:07 Jun 2022 09:08

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