Quantitative fuel-to-air ratio determination for elevated-pressure methane/air flames using chemiluminescence emission

McCord, Walker; Gragston, Mark; Wu, Yue; Hsu, Paul S.; Rein, Keith D.; Jiang, Naibo; Roy, Sukesh; Gord, James R.

doi:10.1364/ao.58.000c61

Cited by 16 publications

(7 citation statements)

References 15 publications

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“…It is well known that the local equivalence ratio in premixed flames correlates with the ratio of the intensities of OH* and CH* [2,4,6,[8][9][10][11][12][13]77]. This relationship can be used to monitor the flame Finally, Figure 16 shows 3D images of time-averaged intensity distributions of OH* or OH* and soot in (a) the non-sooting turbulent methane/air and (b) sooting turbulent ethylene/air diffusion flames, respectively.…”

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

“…For example, it was found that the chemiluminescence of OH* in premixed laminar and moderately turbulent hydrocarbon flames correlates with the heat release rate [2][3][4][5], which is the dominant physical quantity of combustion processes and considerably determines their stability [3]. In addition, various studies have shown that certain ratios of the chemiluminescence intensities (e.g., CH*/OH* [2,[6][7][8][9][10][11][12] and C 2 */OH* [5,6,8,9]) are a measure of the equivalence ratio in premixed flames [2,5,[7][8][9][10]12] and a marker to determine the quality of mixing in premixed or the local stoichiometry in partially-premixed zones of diffusion controlled combustion in turbulent flames [11,13]. Therefore, monitoring the chemiluminescence is a valuable tool for the non-invasive diagnostic of industrial combustion processes.…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Tomographic Simultaneous Multi-Species Visualization—Part I: Experimental Methodology and Application to Laminar and Turbulent Flames

2020

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In recent years, the tomographic visualization of laminar and turbulent flames has received much attention due to the possibility of observing combustion processes on-line and with high temporal resolution. In most cases, either the spectrally non-resolved flame luminescence or the chemiluminescence of a single species is detected and used for the tomographic reconstruction. In this work, we present a novel 2D emission tomographic setup that allows for the simultaneous detection of multiple species (e.g., OH*, CH* and soot but not limited to these) using a single image intensified CCD camera. We demonstrate the simultaneous detection of OH* (310 nm), CH* (430 nm) and soot (750 nm) in laminar methane/air, as well as turbulent methane/air and ethylene/air diffusion flames. As expected, the reconstructed distributions of OH* and CH* in laminar and turbulent flames are highly correlated, which supports the feasibility of tomographic measurements on these kinds of flames and at timescales down to about 1 ms. In addition, the possibilities and limitations of the tomographic approach to distinguish between locally premixed, partially premixed and non-premixed conditions, based on evaluating the local intensity ratio of OH* and CH* is investigated. While the tomographic measurements allow a qualitative classification of the combustion conditions, a quantitative interpretation of instantaneous reconstructed intensities (single shot results) has a much greater uncertainty.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Tomographic Simultaneous Multi-Species Visualization—Part I: Experimental Methodology and Application to Laminar and Turbulent Flames

2020

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“…the reaction zone provides insights into fuel-to-air ratio in premixed combustion systems, and heat release rates to formulate and validate chemical kinetic models [4][5][6][7]. This process can be extended to unsteady and/or turbulent flames by utilizing a high-speed camera, normally with an image intensifier to amplify the relatively weak CL signal.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have focused on highspeed CL imaging consistent with hardware advancements, CL tomography to resolve the 3D field by simultaneously viewing at multiple angles [12][13][14][15][16], and simultaneous detection of multiple species [17,18]. For example, the ratio of peak OH * and CH * CL can provide insight into local equivalence ratio, heat release rate, temperature distribution, etc, in both gaseous and liquid flames [4][5][6][19][20][21]. The present study focuses on simultaneous high-speed CL imaging of multiple combustion species.…”

Section: Introductionmentioning

confidence: 99%

Spatially resolved chemiluminescence imaging of multiple combustion species using a single high-speed camera

James,

Agrawal

2023

Meas. Sci. Technol.

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Simultaneous chemiluminescence imaging of multiple chemical species in unsteady and/or turbulent combustion environments requires multiple high-speed camera/intensifier systems which can be cost prohibitive. This study presents a novel optical configuration for simultaneous, spatially resolved chemiluminescence imaging of two species using a single high-speed camera. The superiority of the technique over existing approaches is demonstrated via a series of experiments in a methane fueled McKenna burner operated at steady and unsteady conditions. Results demonstrate capabilities of the present system to provide spatially resolved measurements of hydroxyl (OH*) and methylidyne (CH*) species without parallax or path length errors in different flame configurations.

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MUltiplexed Structured Image Capture (MUSIC)

Zhang,

Gragston

2023

Coded Optical Imaging

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Quantitative fuel-to-air ratio determination for elevated-pressure methane/air flames using chemiluminescence emission

Cited by 16 publications

References 15 publications

Two-Dimensional Tomographic Simultaneous Multi-Species Visualization—Part I: Experimental Methodology and Application to Laminar and Turbulent Flames

Two-Dimensional Tomographic Simultaneous Multi-Species Visualization—Part I: Experimental Methodology and Application to Laminar and Turbulent Flames

Spatially resolved chemiluminescence imaging of multiple combustion species using a single high-speed camera

MUltiplexed Structured Image Capture (MUSIC)

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