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Experiments in Fluids

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01-05-2017 | Research Article

Intrusive effects of repetitive laser pulsing in high-speed tracer-LIF measurements

Authors: M. Papageorge, J. A. Sutton

Published in: Experiments in Fluids | Issue 5/2017

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Abstract

The effects of repetitive laser pulsing on laser-induced fluorescence (LIF) signals from three popular organic flow tracers, acetone, 3-pentanone, and biacetyl are examined experimentally in the context of high-speed PLIF imaging. The effects of varying the incident laser fluence, laser repetition rates, tracer mole fractions, and carrier gas (air or N₂) are investigated. Repetitive laser pulsing leads to changes in the measured LIF signal as a function of laser pulse number for all three tracers. For biacetyl/air mixtures, the LIF signal increases as a function of pulse number and the LIF signal increase per pulse is observed to be a function of the incident laser fluence. For biacetyl/air mixtures at room temperature, the increase in LIF signal during repetitive laser pulsing is attributed solely to absorptive heating of the probe volume, which is confirmed by Rayleigh scattering thermometry measurements. For acetone and 3-pentanone mixtures in the air, the LIF signal decreases with increasing pulse number and the LIF signal depletion per pulse is a linear function of incident laser fluence. This allows the signal depletion per pulse from acetone and 3-pentanone to be normalized by laser fluence and generalized to a single parameter of 0.002%/pulse/(mJ/cm²). There is no discernable effect of varying the tracer mole fraction or the laser repetition rate over the range of values investigated. The substitution of N₂ for the air as a carrier gas leads to a significant decrease in the signal depletion per pulse. The potential mechanisms for the enhanced signal depletion in the presence of oxygen are discussed. A likely source is “photo-oxidation”, where the products of laser photolysis react with the surrounding O₂ to form the highly reactive hydroxyl (OH) radical, which then oxidizes the tracer. Overall, the current results indicate that under repetitive laser pulsing conditions (i.e., high-speed imaging), the tracer-LIF measurement techniques can be considered intrusive unless the laser fluences are kept sufficiently low. The implications for turbulent flow measurements are discussed including recommendations for minimizing the intrusive repetitive pulsing effects.

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The assertion that laser diagnostics are completely “non-intrusive” only is an approximation. In the majority of fluid dynamic applications, the laser-matter interaction results in minimal intrusion that is acceptable to the user in terms of its influence on the fluid-thermo-chemical state immediately prior to the arrival of the laser pulse. In this manuscript, we refer to this situation as “non-intrusive”. The condition where noticeable laser-induced effects occur is referred to as “intrusive”.

For 2D planar imaging, the third coordinate corresponds to the “out-of-plane” dimension.

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Title: Intrusive effects of repetitive laser pulsing in high-speed tracer-LIF measurements
Authors: M. Papageorge
J. A. Sutton
Publication date: 01-05-2017
Publisher: Springer Berlin Heidelberg
Published in: Experiments in Fluids / Issue 5/2017
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-017-2323-0

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