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Development and application of a reactor network approach for estimating NOx emissions of an aero engine with lean combustion during cruise

Tietz, Sebastian and Schaefer, Martin (2013) Development and application of a reactor network approach for estimating NOx emissions of an aero engine with lean combustion during cruise. In: ONERA DLR Aerospace Symposium 2013. ONERA-DLR Aerospace Symposium 2013, 2013-05-27 - 2013-05-29, Palaiseau, Frankreich.

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Lean combustors as introduced by General Electric in their latest GEnx engine require a new approach for the estimation of in-flight NOx emissions. The approach presented in this paper is implemented as a reactor network model in DLR’s existing combustor pre-design and analysis tool ComDAT. In a reactor network the combustor volume is divided into a number of reactors in which the combustion is calculated with chemical kinetics. The advantage of this approach in comparison to a correlation is that the effect of modifications in the combustor architecture (e. g. cooling concepts) or air-fuel homogenization on the NOx emissions can be investigated. To classify the presented method, alternative methods regarding in-flight emission calculation are initially reviewed and assessed. To enhance the reliability of the emission prediction the reactor networks need to be calibrated. This means that the air and fuel flow distribution within the reactor networks as well as the dimensions of the reactors are adjusted such that the sum of the squared deviations between calculated and reference emissions is minimized for a given set of cruise operating conditions. For modeling the reference (or target) emissions during cruise, publicly available emissions and associated information of the GEnx were used, as this engine type is the only engine in service incorporating lean low-NOx combustion technology. The necessary combustor entry and exit conditions for the different flight states are obtained from an engine model using DLR’s engine performance code VarCycle. The development of the reactor networks, the modeling of the reference emissions as well as the process of calibration is described in this paper. Finally the calibrated reactor networks will be used to estimate and compare the NOx emissions of a generic lean burn engine at three different flight altitudes within cruise.

Item URL in elib:https://elib.dlr.de/82211/
Document Type:Conference or Workshop Item (Speech)
Additional Information:reviewed
Title:Development and application of a reactor network approach for estimating NOx emissions of an aero engine with lean combustion during cruise
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:May 2013
Journal or Publication Title:ONERA DLR Aerospace Symposium 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:aero engine, lean combustion, NOx emissions, cruise, reactor network approach
Event Title:ONERA-DLR Aerospace Symposium 2013
Event Location:Palaiseau, Frankreich
Event Type:international Conference
Event Start Date:27 May 2013
Event End Date:29 May 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine
Institute of Propulsion Technology > Combustor
Deposited By: Tietz, Sebastian
Deposited On:17 Jun 2013 10:44
Last Modified:24 Apr 2024 19:48

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