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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. Journal of Engineering for Gas Turbines and Power, 145 (3). American Society of Mechanical Engineers (ASME). doi: 10.1115/1.4055753. ISSN 0742-4795.

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Official URL: https://asmedigitalcollection.asme.org/gasturbinespower/article/doi/10.1115/1.4055753/1146617/Influence-of-Different-Flow-Solvers-and-Off-Design

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/189106/
Document Type:Article
Title:Influence of Different Flow Solvers and Off-Design Conditions On the Determination of Fan-Rotor Wakes for Broadband Noise Prediction
Authors:
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:5 December 2022
Journal or Publication Title:Journal of Engineering for Gas Turbines and Power
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:145
DOI:10.1115/1.4055753
Editors:
EditorsEmailEditor's ORCID iD
Sawicki, Jerzy T.UNSPECIFIEDUNSPECIFIED
Pokorny, ChrisUNSPECIFIEDUNSPECIFIED
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0742-4795
Status:Published
Keywords:fan noise, pre-design, turbulence modeling, broadband noise
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:19 Dec 2022 09:12

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