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

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.10.012· OSTI ID:21285680

Stopper, U; Aigner, M; Ax, H; Meier, W; Sadanandan, R; Stoehr, M ^[1]; Bonaldo, A ^[2]

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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)

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)

• OSTI ID: 21285680
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 3 Vol. 34; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AIR
BURNERS
COMBUSTION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
EXHAUST GASES
FLAMES
FLUCTUATIONS
GAS TURBINES
HYDROXYL RADICALS
KILOWATT POWER RANGE
LAYERS
Laser diagnostics
MIXING
MIXTURES
NATURAL GAS
PRESSURE RANGE KILO PA
SHAPE
SHEAR
SPATIAL DISTRIBUTION
TEMPERATURE DISTRIBUTION
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TURBULENCE
TURBULENT FLOW
Turbulence-chemistry interaction
VELOCITY
VORTICES
ZONES