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LES Investigation of Core Noise Mechanisms inside a Combustor-Nozzle System

O'Brien, Jeffrey and Bake, Friedrich and Kim, Jeonglae and Ihme, Matthias (2016) LES Investigation of Core Noise Mechanisms inside a Combustor-Nozzle System. In: 69th Annual Meeting of the APS Division of Fluid Dynamics, 61 (20). 69th Annual Meeting of the APS Division of Fluid Dynamics, 20. - 22. November 2016, Portland, Oregon, USA.

Full text not available from this repository.

Official URL: http://meetings.aps.org/Meeting/DFD16/Session/G4.3

Abstract

The aim of this work is to expand knowledge of core noise physics through the study of a representative aviation-type combustor with a converging-diverging nozzle attached to the exhaust. First, a fully compressible LES of the entire flowpath is performed and validated against experimental measurements. From this calculation, the time history of the flow is sampled in a plane near the nozzle entrance in order to construct a library of representative fluctuations that are potential precursors to the direct and indirect noise observed at the nozzle outlet. This data is then used as an inflow for a series of separate nozzle simulations in which fluctuations in pressure, temperature ("hot spots"), and mixture composition are imposed separately to isolate their effect on the emitted noise. This methodology allows quantitative investigation of core-noise physics that lower-order models do not, including: the effect of non-linearity of high-amplitude perturbations, superposition of forcing types, the impact of the spatial structure of the perturbations, and the restriction to low-frequency perturbations and calorically perfect gas assumption. The calculations also represent the first time that variations in mixture composition have been shown to induce downstream noise in a high-fidelity, 3D simulation.

Item URL in elib:https://elib.dlr.de/109474/
Document Type:Conference or Workshop Item (Speech)
Title:LES Investigation of Core Noise Mechanisms inside a Combustor-Nozzle System
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
O'Brien, JeffreyStanford University - Center for Turbulence ResearchUNSPECIFIED
Bake, FriedrichDLR, AT-TRAUNSPECIFIED
Kim, JeonglaeStanford University - Center for Turbulence ResearchUNSPECIFIED
Ihme, MatthiasStanford University - Center for Turbulence ResearchUNSPECIFIED
Date:21 November 2016
Journal or Publication Title:69th Annual Meeting of the APS Division of Fluid Dynamics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:61
Series Name:Bulletin of the American Physical Society
Status:Published
Keywords:LES, Combustion Noise, DLR Model Combustor
Event Title:69th Annual Meeting of the APS Division of Fluid Dynamics
Event Location:Portland, Oregon, USA
Event Type:international Conference
Event Dates:20. - 22. November 2016
Organizer:American Physical Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:04 Jan 2017 11:41
Last Modified:07 Feb 2018 16:16

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