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: Turbomachinery Technical Conference and Exposition, GT 2022, 5. The American Society of Mechanical Engineers. ASME Turbo Expo 2022, 2022-06-13 - 2022-06-17, Rotterdam, The Netherlands. doi: 10.1115/GT2022-78406. ISBN 978-079188612-0.
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Official URL: https://asmedigitalcollection.asme.org/GT/proceedings-abstract/GT2022/86021/V005T10A002/1148836
Abstract
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/ | ||||||||||||||||
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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 | ||||||||||||||||
Authors: |
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Date: | 28 October 2022 | ||||||||||||||||
Journal or Publication Title: | ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, GT 2022 | ||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||
Open Access: | Yes | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||
Volume: | 5 | ||||||||||||||||
DOI: | 10.1115/GT2022-78406 | ||||||||||||||||
Publisher: | The American Society of Mechanical Engineers | ||||||||||||||||
Series Name: | Turbo Expo: Power for Land, Sea, and Air | ||||||||||||||||
ISBN: | 978-079188612-0 | ||||||||||||||||
Status: | Published | ||||||||||||||||
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 Start Date: | 13 June 2022 | ||||||||||||||||
Event End Date: | 17 June 2022 | ||||||||||||||||
Organizer: | ASME | ||||||||||||||||
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: | 24 Apr 2024 20:50 |
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