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Modelling of the flow field within a generic aero-engine combustor

Eggels, R.L.G.M. and Hassa, Christoph (2005) Modelling of the flow field within a generic aero-engine combustor. In: Proceedings of the 41st. AIAA/SAE/AESEE Joint Propulsion Conference (3970), pp. 1-15. American Institute of Aeronautics and Astronautics. 41st. AIAA/SAE/AESEE Joint Propulsion Conference, 2005-07-10 - 2005-07-13, Tucson, AZ (USA).

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Abstract

A generic combustor has been modelled using Reynolds Averaged Numerical Simulations (RANS) and Large Eddy Simulations (LES). The combustor is representative of a sector of an aero-engine combustor, including one fuel injector and several dilutions ports. To enable optical measurements the combustor has been equipped with air-cooled quartz windows. Both RANS and LES computations have been performed, and two grids have been applied. One grid represents the combustor only, while the other also includes the burner swirler passages. The difference between applying the boundary conditions at combustor inlet and including the swirlers in the CFD model are studied. The computations are performed with a Rolls-Royce in-house code. The code is block-structured and parallelised using MPI (Message Passing Interface). Both isothermal and combustion computations have been carried out. The combustion process has been modelled with a conserved scalar flamelet model, but also a finite rate chemical model has been applied. Detailed experimental data are available (LDA, PIV, DGV, Raman, CARS) with the primary and dilution zone of the combustor. The measurements have been performed by DLR Cologne within the EC funded research project MOLECULES. The cold flow field in the primary zone is represented well by both the RANS and LES model, but if the injector is modelled, the combustor inlet profiles are better represented by the LES model. In the dilution zone there are larger differences between LES and RANS. The RANS computations underestimate the jet penetration. The combusting simulations using the conserved scalar model compare not very well with the experimental results close to the injector: the mixture burns too fast. The finite rate reaction model, combined with RANS gave better results. It is concluded that in the vicinity of the injector the chemistry cannot be assumed to be infinitely fast.

Item URL in elib:https://elib.dlr.de/21643/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Modelling of the flow field within a generic aero-engine combustor
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Eggels, R.L.G.M.Rolls-Royce DeutschlandUNSPECIFIED
Hassa, ChristophUNSPECIFIEDUNSPECIFIED
Date:10 July 2005
Journal or Publication Title:Proceedings of the 41st. AIAA/SAE/AESEE Joint Propulsion Conference
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-15
Publisher:American Institute of Aeronautics and Astronautics
Status:Published
Keywords:Brennkammer, Modellierung, LES, RANS,Validation
Event Title:41st. AIAA/SAE/AESEE Joint Propulsion Conference
Event Location:Tucson, AZ (USA)
Event Type:international Conference
Event Dates:2005-07-10 - 2005-07-13
Organizer:American Institute of Aeronautics and Astronautics
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 > Combustor > Combustion Physics
Deposited By: Hassa, Dr.-Ing. Christoph
Deposited On:23 Mar 2006
Last Modified:12 Dec 2013 20:09

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