Measurement of the conditioned turbulence and temperature field of a premixed Bunsen burner by planar laser Rayleigh scattering and stereo particle image velocimetry

The turbulence and temperature field of Bunsen-type turbulent lean methane/air flames has been investigated using planar laser Rayleigh scattering (PLRS) and stereo particle image velocimetry (stereo PIV). Temporally averaged reaction progress variable plots have been computed from PLRS measurements...

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Bibliographic Details
Published in:Experiments in fluids 2005-08, Vol.39 (2), p.375-384
Main Authors: PFADLER, Sebastian, LÖFFLER, Micha, DINKELACKER, Friedrich, LEIPERTZ, Alfred
Format: Article
Language:English
Subjects:
Aerodynamics
Applied sciences
Combustion of gaseous fuels
Combustion. Flame
Computational fluid dynamics
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fluid flow
Mathematical analysis
Mathematical models
Rayleigh scattering
Theoretical studies. Data and constants. Metering
Turbulence
Turbulent flow
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Summary:The turbulence and temperature field of Bunsen-type turbulent lean methane/air flames has been investigated using planar laser Rayleigh scattering (PLRS) and stereo particle image velocimetry (stereo PIV). Temporally averaged reaction progress variable plots have been computed from PLRS measurements in order to provide a basis with regards to the verification of computational fluid dynamics (CFD) models. Turbulence was characterised by stereo PIV in one plane for all three velocity components. Averaged velocity fields have been calculated, as well as Reynolds-decomposed fluctuation vector fields. Conditioned root mean square (RMS) values of the turbulent fluctuations in terms of unburnt and burnt gas could be determined by making use of the information gained from a threshold setting procedure in the PIV raw images. Furthermore, several length scales were measured indirectly from PIV vector plots. In this context, all integral length scales being accessible with stereo PIV were computed separately for the burnt and unburnt regions and were compared to each other. It could be observed that all integral length scales increased in the burnt zone. Additionally, the conditioned Taylor and Kolmogorov lengths have been extracted from the PIV field data, derived either from the zero-radius curvature of the correlation function or from common turbulence theory relations.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-005-0980-x