Probe and optical diagnostics for scalar measurements in premixed flames

Probe and optical diagnostics for scalar measurements in premixed flames  Procedures which allow the measurement of scalars in premixed recirculating flames using digitally-compensated thermocouples or, alternatively, laser-Rayleigh scattering, are described together with the error sources associated with the use of these techniques. The procedure for the numeric compensation of the thermocouple signals included experimental data on the characteristics of the effect of velocity and temperature on the time constant of the thermocouple and was optimised to guarantee the temporal resolution of the system. The Rayleigh system included its calibration in a propane/air flame and was optimised to avoid contamination of Mie scattering from small particles. The effect of the photomultiplier shot noise on the Rayleigh signal is quantified and used to compensate the results. The two techniques are shown to give rise to results in close agreement and to be suitable to characterise the turbulence nature of strongly recirculating premixed flames. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Probe and optical diagnostics for scalar measurements in premixed flames

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Publisher
Springer-Verlag
Copyright
Copyright © 1998 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s003480050188
Publisher site
See Article on Publisher Site

Abstract

 Procedures which allow the measurement of scalars in premixed recirculating flames using digitally-compensated thermocouples or, alternatively, laser-Rayleigh scattering, are described together with the error sources associated with the use of these techniques. The procedure for the numeric compensation of the thermocouple signals included experimental data on the characteristics of the effect of velocity and temperature on the time constant of the thermocouple and was optimised to guarantee the temporal resolution of the system. The Rayleigh system included its calibration in a propane/air flame and was optimised to avoid contamination of Mie scattering from small particles. The effect of the photomultiplier shot noise on the Rayleigh signal is quantified and used to compensate the results. The two techniques are shown to give rise to results in close agreement and to be suitable to characterise the turbulence nature of strongly recirculating premixed flames.

Journal

Experiments in FluidsSpringer Journals

Published: May 11, 1998

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