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Title: PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames

Abstract

Several laser diagnostic measurement techniques have been applied to study the lean premixed natural gas/air flames of an industrial swirl burner. This was made possible by equipping the burner with an optical combustion chamber that was installed in the high-pressure test rig facility at the DLR Institute of Combustion Technology in Stuttgart. The burner was operated with preheated air at various operating conditions with pressures up to p = 6 bar and a maximum thermal power of P = 1 MW. The instantaneous planar flow field inside the combustor was studied with particle image velocimetry (PIV). Planar laser induced fluorescence (PLIF) of OH radicals on a single-shot basis was used to determine the shape and the location of the flame front as well as the spatial distribution of reaction products. 1D laser Raman spectroscopy was successfully applied for the measurement of the temperature and the concentration of major species under realistic gas turbine conditions. Results of the flow field analysis show the shape and the size of the main flow regimes: the inflow region, the inner and the outer recirculation zone. The highly turbulent flow field of the inner shear layer is found to be dominated by small and mediummore » sized vortices. High RMS fluctuations of the flow velocity in the exhaust gas indicate the existence of a rotating exhaust gas swirl. From the PLIF images it is seen that the primary reactions happened in the shear layers between inflow and the recirculation zones and that the appearance of the reaction zones changed with flame parameters. The results of the multiscalar Raman measurements show a strong variation of the local mixture fraction allowing conclusions to be drawn about the premix quality. Furthermore, mixing effects of unburnt fuel and air with fully reacted combustion products are studied giving insights into the processes of the turbulence-chemistry interaction. (author)« less

Authors:
; ; ; ; ;  [1];  [2]
  1. German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, D-70569 Stuttgart (Germany)
  2. Siemens Industrial Turbomachinery Ltd., Combustion Group, P. O. Box 1, Waterside South, Lincoln LN5 7FD (United Kingdom)
Publication Date:
OSTI Identifier:
21285680
Resource Type:
Journal Article
Journal Name:
Experimental Thermal and Fluid Science
Additional Journal Information:
Journal Volume: 34; Journal Issue: 3; Conference: Sixth Mediterranean Combustion Symposium, Corsica (France), 7-11 Jun 2009; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0894-1777
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; GAS TURBINES; NATURAL GAS; PRESSURE RANGE KILO PA; AIR; COMBUSTION; FLAMES; FLUCTUATIONS; COMBUSTION KINETICS; BURNERS; ZONES; HYDROXYL RADICALS; SPATIAL DISTRIBUTION; TURBULENT FLOW; LAYERS; MIXTURES; SHAPE; SHEAR; TURBULENCE; EXHAUST GASES; VELOCITY; COMBUSTION PRODUCTS; MIXING; TEMPERATURE DISTRIBUTION; VORTICES; KILOWATT POWER RANGE; TEMPERATURE RANGE 1000-4000 K; TEMPERATURE RANGE 0400-1000 K; Turbulence-chemistry interaction; Laser diagnostics

Citation Formats

Stopper, U, Aigner, M, Ax, H, Meier, W, Sadanandan, R, Stoehr, M, and Bonaldo, A. PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames. United States: N. p., 2010. Web. doi:10.1016/J.EXPTHERMFLUSCI.2009.10.012.
Stopper, U, Aigner, M, Ax, H, Meier, W, Sadanandan, R, Stoehr, M, & Bonaldo, A. PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames. United States. https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.10.012
Stopper, U, Aigner, M, Ax, H, Meier, W, Sadanandan, R, Stoehr, M, and Bonaldo, A. 2010. "PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames". United States. https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.10.012.
@article{osti_21285680,
title = {PIV, 2D-LIF and 1D-Raman measurements of flow field, composition and temperature in premixed gas turbine flames},
author = {Stopper, U and Aigner, M and Ax, H and Meier, W and Sadanandan, R and Stoehr, M and Bonaldo, A},
abstractNote = {Several laser diagnostic measurement techniques have been applied to study the lean premixed natural gas/air flames of an industrial swirl burner. This was made possible by equipping the burner with an optical combustion chamber that was installed in the high-pressure test rig facility at the DLR Institute of Combustion Technology in Stuttgart. The burner was operated with preheated air at various operating conditions with pressures up to p = 6 bar and a maximum thermal power of P = 1 MW. The instantaneous planar flow field inside the combustor was studied with particle image velocimetry (PIV). Planar laser induced fluorescence (PLIF) of OH radicals on a single-shot basis was used to determine the shape and the location of the flame front as well as the spatial distribution of reaction products. 1D laser Raman spectroscopy was successfully applied for the measurement of the temperature and the concentration of major species under realistic gas turbine conditions. Results of the flow field analysis show the shape and the size of the main flow regimes: the inflow region, the inner and the outer recirculation zone. The highly turbulent flow field of the inner shear layer is found to be dominated by small and medium sized vortices. High RMS fluctuations of the flow velocity in the exhaust gas indicate the existence of a rotating exhaust gas swirl. From the PLIF images it is seen that the primary reactions happened in the shear layers between inflow and the recirculation zones and that the appearance of the reaction zones changed with flame parameters. The results of the multiscalar Raman measurements show a strong variation of the local mixture fraction allowing conclusions to be drawn about the premix quality. Furthermore, mixing effects of unburnt fuel and air with fully reacted combustion products are studied giving insights into the processes of the turbulence-chemistry interaction. (author)},
doi = {10.1016/J.EXPTHERMFLUSCI.2009.10.012},
url = {https://www.osti.gov/biblio/21285680}, journal = {Experimental Thermal and Fluid Science},
issn = {0894-1777},
number = 3,
volume = 34,
place = {United States},
year = {2010},
month = {4}
}