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Flow Field Characterization at the Outlet of a Lean Burn Single-Sector Combustor by Laser-Optical Methods

Schroll, Michael and Doll, Ulrich and Stockhausen, Guido and Meier, Ulrich and Willert, Christian and Hassa, Christoph and Bagchi, Imon-Kalyan (2017) Flow Field Characterization at the Outlet of a Lean Burn Single-Sector Combustor by Laser-Optical Methods. Journal of Engineering for Gas Turbines and Power, 139 (1), 011503-011503. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4034040 ISSN 0742-4795

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Official URL: http://dx.doi.org/10.1115/1.4034040

Abstract

High overall pressure ratio (OPR) engine cycles for reduced NOx emissions will generate new aggravated requirements and boundary conditions by implementing low emission combustion technologies into advanced engine architectures. Lean burn combustion systems will have a significant impact on the temperature and velocity traverse at the combustor exit. Lean burn fuel injectors dominate the combustor exit conditions. This is due to the fact that they pass a majority of the total combustor flow, and to the lack of mixing jets like in a conventional combustor. With the transition to high-pressure engines, it is essential to fully understand and determine the high energetic interface between combustor and turbine to avoid excessive cooling. Velocity distributions and their fluctuations at the combustor exit for lean burn are of special interest as they can influence the efficiency and capacity of the turbine. A lean burn single-sector combustor was designed and built at DLR, providing optical access to its rectangular exit section. The sector was operated with a fuel-staged lean burn injector. Measurements were performed under idle and cruise operating conditions. Two velocity measurement techniques were used in the demanding environment of highly luminous flames under elevated pressures: particle image velocimetry (PIV) and filtered Rayleigh scattering (FRS). The latter was used for the first time in an aero-engine combustor environment. In addition to a conventional signal detection arrangement, FRS was also applied with an endoscope for signal collection, to assess its practicality for a potential future application in a full annular combustor with restricted optical access.

Item URL in elib:https://elib.dlr.de/107329/
Document Type:Article
Title:Flow Field Characterization at the Outlet of a Lean Burn Single-Sector Combustor by Laser-Optical Methods
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schroll, Michaelmichael.schroll (at) dlr.deUNSPECIFIED
Doll, Ulrichulrich.doll (at) dlr.deUNSPECIFIED
Stockhausen, Guidoguido.stockhausen (at) dlr.deUNSPECIFIED
Meier, Ulrichulrich.meier (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Hassa, Christophchristoph.hassa (at) dlr.deUNSPECIFIED
Bagchi, Imon-KalyanRolls-Royce DeutschlandUNSPECIFIED
Date:January 2017
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:139
DOI :10.1115/1.4034040
Page Range:011503-011503
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0742-4795
Status:Published
Keywords:Combustion chambers , Lasers , Temperature measurement , Engines , Velocity, Cooling , Signals , Emissions , High temperature , Combustion Technologies, filtered Rayleigh scattering, Particle Image Velocimetry
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, L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Combustor
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Doll, Ulrich
Deposited On:04 Jan 2017 11:39
Last Modified:08 Mar 2018 18:42

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