Emission tomography in flame diagnostics

Denisova, N. V.; Tretyakov, P. K.; Tupikin, A. V.

doi:10.1016/j.combustflame.2012.11.005

Cited by 36 publications

(12 citation statements)

References 23 publications

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“…(6) and (7) can be applied to other types of optical tomography measurements based on other signal generation mechanisms, as being pursued in our ongoing work. Numerous algorithms [6,21,[26][27][28][29] have been proposed to solve Eq. (7).…”

Section: Experimental Setup and Data Processingmentioning

confidence: 99%

Fiber-based endoscopes for 3D combustion measurements: View registration and spatial resolution

Kang

2014

Combustion and Flame

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Section: Experimental Setup and Data Processingmentioning

confidence: 99%

Fiber-based endoscopes for 3D combustion measurements: View registration and spatial resolution

Kang

2014

Combustion and Flame

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“…With the advancement of camera and computational technologies, recent work has demonstrated the feasibility of combining chemiluminescence with tomography, referred to as tomographic chemiluminescence (TC) here, to obtain instantaneous 3D flame measurements [7,[11][12][13][14][15]. The TC technique employs multiple cameras to obtain 2D projection measurements of the target flame from different perspectives.…”

Section: Introductionmentioning

confidence: 99%

“…One of the key research needs for the further development of the TC technique involves the validation of the 3D measurements (a research need shared also by other tomographic-based 3D diagnostics). Several methods have been developed and applied in these past research efforts for validation purposes, including numerical simulations based on phantoms [7,12,15,17], use of controlled flames with known patterns [11,15,18], and comparison between 3D results obtained experimentally and simulated results obtained via ray tracing [19,20]. Further validation is always desired for the development of new diagnostic tools, and the validation method should ideally be as direct as possible.…”

Section: Introductionmentioning

confidence: 99%

3D flame topography obtained by tomographic chemiluminescence with direct comparison to planar Mie scattering measurements

Wickersham

et al. 2015

Appl. Opt.

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This work reports the measurements of 3D flame topography using tomographic chemiluminescence and its validation by direct comparison against planar Mie scattering measurements. Tomographic measurements of the 3D topography of various well-controlled laboratory flames were performed using projections measured by seven cameras, and a simultaneous Mie scattering measurement was performed to measure a 2D cross section of the 3D flame topography. The tomographic measurements were based on chemiluminescence emissions from the flame, and the Mie scattering measurements were based on micrometer-size oil droplets seeded into the flow. The flame topography derived from the 3D tomographic and the Mie scattering measurement was then directly compared. The results show that the flame topography obtained from tomographic chemiluminescence and the Mie measurement agreed qualitatively (i.e., both methods yielded the same profile of the flame fronts), but a quantitative difference on the order of millimeters was observed between these two methods. These results are expected to be useful for understanding the capabilities and limitations of the 3D tomographic and Mie scattering techniques in combustion diagnostics.

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“…Various algorithms have been proposed to solve this problem [11,16,20,21] and this work adopted an algorithm based on simulated annealing as described in [11] (code named TISA, Tomographic Inversion by Simulated Annealing). The algorithm has been demonstrated effective to solve other types of inversion problems in combustion measurements [22][23][24].…”

Section: Tc Technique Fundamentalsmentioning

confidence: 99%

“…Such prospective capabilities have motivated several investigations on the use of TC for volumetric combustion measurements. Denisova et al discussed a new tomographic algorithms and reported validation results on axially symmetric flames [16]. Worth et al demonstrated TC as a powerful tool for resolving large scale vortex-flame dynamics by measuring mean and phased-averaged OH* distributions [17].…”

Section: Introductionmentioning

confidence: 99%

Volumetric imaging of turbulent reactive flows at kHz based on computed tomography

Li¹,

Ma²

2014

Opt. Express

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Diagnostics with three-dimensional (3D) spatial resolution and rapid temporal resolution have been long desired to resolve the complicated turbulence-chemistry interactions. This paper describes a method based on based on tomographic chemiluminescence (TC) to address this diagnostic need. The TC technique used multiple cameras to simultaneously record CH* chemiluminescence emitted by turbulent flames from different view angles. A 3D tomographic algorithm was then applied to reconstruct the instantaneous flame structures volumetrically. Both experimental and computational studies have been conducted to demonstrate and validate the 3D measurements. Experimental results were obtained instantaneously at kHz temporal rate, in a volume of 16 × 16 × 16 cm 3 , and with a spatial resolution estimated to be 2~3 mm. Computations were conducted to simulate the experimental conditions for comparison and validation.

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Emission tomography in flame diagnostics

Cited by 36 publications

References 23 publications

Fiber-based endoscopes for 3D combustion measurements: View registration and spatial resolution

Fiber-based endoscopes for 3D combustion measurements: View registration and spatial resolution

3D flame topography obtained by tomographic chemiluminescence with direct comparison to planar Mie scattering measurements

Volumetric imaging of turbulent reactive flows at kHz based on computed tomography

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