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Influence of Different Flow Solvers and Off-Design Conditions on the Determination of Fan-Rotor Wakes for Broadband Noise Prediction

Meier zu Ummeln, Robert and Moreau, Antoine and Schnoes, Markus (2022) Influence of Different Flow Solvers and Off-Design Conditions on the Determination of Fan-Rotor Wakes for Broadband Noise Prediction. In: ASME Turbo Expo 2022, 5. The American Society of Mechanical Engineers. ASME Turbo Expo 2022, 13.-17. Juni 2022, Rotterdam, The Netherlands. doi: 10.1115/GT2022-78406. ISBN 978-0-7918-8602-1.

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Official URL: https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2022/86021/V005T10A002/1148836


The acoustic interaction of fan-rotor wakes with the downstream stator vanes is considered as an important noise source of an aircraft engine. The turbulence induced by the rotor generates a stochastic acoustic source that appears as broadband noise in the acoustic spectrum. During the preliminary design phase of an engine, established meanline and throughflow solvers usually do not resolve turbulence and associated unsteady flow parameters. But such solvers provide rotor pressure losses that can be used to estimate the mean and turbulent rotor wakes. A crucial step is the deduction of turbulence parameters from the mean wakes. A semi-empirical model for rotor-wake turbulence estimation is presented in this paper. The meanline method and the throughflow solver are compared to three-dimensional computational flow simulations investigating the capabilities of the different solvers to provide flow data for broadband wake interaction noise prediction. The methods are applied to a representative modern fan stage at a comprehensive number of operating points, comprising several speed lines from surge to choking conditions. Microphone measurements are consulted to assess the noise predictions. The evaluation confirms the applicability of the meanline and throughflow method in combination with the turbulence model for broadband noise estimation during the preliminary design phase. The underestimated turbulence in the tip region of the fan is found to be negligible even during off-design conditions.

Item URL in elib:https://elib.dlr.de/189103/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of Different Flow Solvers and Off-Design Conditions on the Determination of Fan-Rotor Wakes for Broadband Noise Prediction
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Meier zu Ummeln, RobertRobert.MeierzuUmmeln (at) dlr.deUNSPECIFIED
Moreau, Antoineantoine.moreau (at) dlr.deUNSPECIFIED
Schnoes, Markusmarkus.schnoes (at) dlr.deUNSPECIFIED
Date:28 October 2022
Journal or Publication Title:ASME Turbo Expo 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Publisher:The American Society of Mechanical Engineers
Series Name:Turbo Expo: Power for Land, Sea, and Air
Keywords:fan noise, pre-design, turbulence modeling, broadband noise
Event Title:ASME Turbo Expo 2022
Event Location:Rotterdam, The Netherlands
Event Type:international Conference
Event Dates:13.-17. Juni 2022
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 - Virtual Engine
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Meier zu Ummeln, Robert
Deposited On:24 Oct 2022 08:25
Last Modified:21 Nov 2022 09:31

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