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Temperature imaging of turbulent dilute spray flames using two-line atomic fluorescence

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Abstract

This paper reports the first application of nonlinear excitation regime two-line atomic fluorescence imaging (NTLAF) of indium to measure temperature in turbulent flames of dilute sprays. Indium chloride is dissolved in acetone fuel which is atomised with an ultrasonic nebuliser and supplied with carrier air into a standard piloted burner. It is found that the indium fluorescence signal is not affected by scattering from the droplets or fuel vapour and that no changes to the optical arrangement used with gaseous flames were required. Notwithstanding the lower temperature thresholds of 800 K imposed by the population of excitation species for the NTLAF method and of 1,200 K imposed by the mechanism of releasing gas-phase indium from its salt, the comparisons of conditional and pseudo-unconditional means with thermocouple measurements performed in a range of turbulent spray flames are quite favourable. The NTLAF signal quality deteriorates on the jet centreline at upstream locations and on the lean side of the flame, the former being largely due to insufficient conversion of indium chloride to indium atoms and the latter potentially due to indium oxidation. Nevertheless, the signal-to-noise ratios obtained in the reaction zone regions are good and the results reveal the expected temperature trends in the turbulent spray flames tested here. Further developments are necessary to resolve the mechanism of indium formation and to broaden the temperature range.

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Acknowledgments

The authors are grateful for the support from the Centre for Energy Technology (CET) and The University of Adelaide. Contributions to the development of the NTLAF technique by Qing Nian “Shaun” Chan, Zeyad Alwahabi and Saleh Mahmoud are greatly appreciated. Agisilaos Kourmatzis and Vinayaka Nakul Prasad contributed useful discussions with the burner operation. The Australian Research Council (ARC) is acknowledged for funding support.

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Authors and Affiliations

  1. School of Mechanical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia

    Paul R. Medwell, Bassam B. Dally & Graham J. Nathan

  2. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW, 2006, Australia

    Assaad R. Masri & Phuong X. Pham

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  1. Paul R. Medwell
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  2. Assaad R. Masri
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  4. Bassam B. Dally
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Correspondence to Paul R. Medwell.

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Medwell, P.R., Masri, A.R., Pham, P.X. et al. Temperature imaging of turbulent dilute spray flames using two-line atomic fluorescence. Exp Fluids 55, 1840 (2014). https://doi.org/10.1007/s00348-014-1840-3

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