Heat release rate estimation in laminar premixed flames using laser-induced fluorescence of CH2O and H-atom

Irfan A. Mulla, Aadil Dowlut, Taaha Hussain, Zacharias M. Nikolaou, Satyanarayanan R. Chakravarthy, Nedunchezhian Swaminathan, Ramanarayanan Balachandran

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The present work demonstrates the feasibility of heat release rate imaging using the laser-induced fluorescence (LIF) of atomic hydrogen (H-atom) and formaldehyde (CH2O) in laminar premixed flames. The product of H-atom LIF and CH2O LIF signals is evaluated on a pixel-by-pixel basis and is compared with that of the OH × CH2O technique. These results for equivalence ratio ranging from 0.8 to 1.1 are compared with computations of one-dimensional freely-propagating flames. The performance of these markers is studied based on the following two aspects: the spatial accuracy of the local heat release rate and the trend in the total heat release rate with equivalence ratio. The measured trend in the spatial distribution of radicals and the deduced heat release rate agree well with the computational values. The variation in the spatially integrated heat release rate as a function of equivalence ratio is also investigated. The results suggest that the trend in the variation of the integrated heat release rate and the spatial location of heat release rate can be evaluated by either of these markers. The OH-based marker showed certain sensitivity to the chemical mechanism as compared to the H-atom based marker. Both the OH-based and H-atom based techniques provide close estimates of heat release rate. The OH based technique has practical advantage when compared to the H-atom based method, primarily due to the fact that the H-atom LIF is a two-photon process.

LanguageEnglish
Pages373-383
Number of pages11
JournalCombustion and Flame
Volume165
Early online date20 Jan 2016
DOIs
Publication statusPublished - 1 Mar 2016
Externally publishedYes

Fingerprint

premixed flames
laser induced fluorescence
Fluorescence
heat
Atoms
Lasers
Atom lasers
markers
atoms
equivalence
trends
Two photon processes
Pixels
pixels
Hydrogen
Hot Temperature
Formaldehyde
Spatial distribution
formaldehyde
Enthalpy

Keywords

  • atomic hydrogen
  • flame structure
  • formaldehyde
  • heat release rate
  • laser-induced fluorescence
  • OH

Cite this

Mulla, I. A., Dowlut, A., Hussain, T., Nikolaou, Z. M., Chakravarthy, S. R., Swaminathan, N., & Balachandran, R. (2016). Heat release rate estimation in laminar premixed flames using laser-induced fluorescence of CH2O and H-atom. Combustion and Flame, 165, 373-383. https://doi.org/10.1016/j.combustflame.2015.12.023
Mulla, Irfan A. ; Dowlut, Aadil ; Hussain, Taaha ; Nikolaou, Zacharias M. ; Chakravarthy, Satyanarayanan R. ; Swaminathan, Nedunchezhian ; Balachandran, Ramanarayanan. / Heat release rate estimation in laminar premixed flames using laser-induced fluorescence of CH2O and H-atom. In: Combustion and Flame. 2016 ; Vol. 165. pp. 373-383.
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Mulla, IA, Dowlut, A, Hussain, T, Nikolaou, ZM, Chakravarthy, SR, Swaminathan, N & Balachandran, R 2016, 'Heat release rate estimation in laminar premixed flames using laser-induced fluorescence of CH2O and H-atom' Combustion and Flame, vol. 165, pp. 373-383. https://doi.org/10.1016/j.combustflame.2015.12.023

Heat release rate estimation in laminar premixed flames using laser-induced fluorescence of CH2O and H-atom. / Mulla, Irfan A.; Dowlut, Aadil; Hussain, Taaha; Nikolaou, Zacharias M.; Chakravarthy, Satyanarayanan R.; Swaminathan, Nedunchezhian; Balachandran, Ramanarayanan.

In: Combustion and Flame, Vol. 165, 01.03.2016, p. 373-383.

Research output: Contribution to journalArticle

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T1 - Heat release rate estimation in laminar premixed flames using laser-induced fluorescence of CH2O and H-atom

AU - Mulla, Irfan A.

AU - Dowlut, Aadil

AU - Hussain, Taaha

AU - Nikolaou, Zacharias M.

AU - Chakravarthy, Satyanarayanan R.

AU - Swaminathan, Nedunchezhian

AU - Balachandran, Ramanarayanan

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The present work demonstrates the feasibility of heat release rate imaging using the laser-induced fluorescence (LIF) of atomic hydrogen (H-atom) and formaldehyde (CH2O) in laminar premixed flames. The product of H-atom LIF and CH2O LIF signals is evaluated on a pixel-by-pixel basis and is compared with that of the OH × CH2O technique. These results for equivalence ratio ranging from 0.8 to 1.1 are compared with computations of one-dimensional freely-propagating flames. The performance of these markers is studied based on the following two aspects: the spatial accuracy of the local heat release rate and the trend in the total heat release rate with equivalence ratio. The measured trend in the spatial distribution of radicals and the deduced heat release rate agree well with the computational values. The variation in the spatially integrated heat release rate as a function of equivalence ratio is also investigated. The results suggest that the trend in the variation of the integrated heat release rate and the spatial location of heat release rate can be evaluated by either of these markers. The OH-based marker showed certain sensitivity to the chemical mechanism as compared to the H-atom based marker. Both the OH-based and H-atom based techniques provide close estimates of heat release rate. The OH based technique has practical advantage when compared to the H-atom based method, primarily due to the fact that the H-atom LIF is a two-photon process.

AB - The present work demonstrates the feasibility of heat release rate imaging using the laser-induced fluorescence (LIF) of atomic hydrogen (H-atom) and formaldehyde (CH2O) in laminar premixed flames. The product of H-atom LIF and CH2O LIF signals is evaluated on a pixel-by-pixel basis and is compared with that of the OH × CH2O technique. These results for equivalence ratio ranging from 0.8 to 1.1 are compared with computations of one-dimensional freely-propagating flames. The performance of these markers is studied based on the following two aspects: the spatial accuracy of the local heat release rate and the trend in the total heat release rate with equivalence ratio. The measured trend in the spatial distribution of radicals and the deduced heat release rate agree well with the computational values. The variation in the spatially integrated heat release rate as a function of equivalence ratio is also investigated. The results suggest that the trend in the variation of the integrated heat release rate and the spatial location of heat release rate can be evaluated by either of these markers. The OH-based marker showed certain sensitivity to the chemical mechanism as compared to the H-atom based marker. Both the OH-based and H-atom based techniques provide close estimates of heat release rate. The OH based technique has practical advantage when compared to the H-atom based method, primarily due to the fact that the H-atom LIF is a two-photon process.

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KW - formaldehyde

KW - heat release rate

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