Characterization of scalar mixing in dense gaseous jets using X-ray computed tomography

Dunnmon, Jared; Sobhani, Sadaf; Kim, Tae Wook; Kovscek, Anthony R.; Ihme, Matthias

doi:10.1007/s00348-015-2057-9

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…More recently, X-ray fluorescence experiments have been performed to obtain quantitative measurements of density fields in turbulent shear-coaxial jet flames [13], sampling-probe perturbations [14], and heated miniature reactors [15], demonstrating the feasibility of using krypton and argon as fluorescent species. Laboratory X-ray sources have been employed for tomographic imaging of in-situ combustion for oil recovery [16], for probing the spray structure in a full-cone atomizer [17], for investigating the scalar mixing in turbulent jets [18], and for examining the interstitial flame structure and temperature field in porous media burners [19].…”

Section: Introductionmentioning

confidence: 99%

X-ray computed tomography for flame-structure analysis of laminar premixed flames

Boigné

Muhunthan

Mohaddes

et al. 2019

Combustion and Flame

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Quantitative X-ray computed tomography (XCT) diagnostics for reacting flows are developed and demonstrated in application to premixed flames in open and optically inaccessible geometries. A laboratory X-ray scanner is employed to investigate methane/air flames that were diluted with krypton as an inert radiodense tracer gas. Effects of acquisition rate and tracer gas concentration on the signal-to-noise ratio are examined. It is shown that statistically converged three-dimensional attenuation measurements can be obtained with limited impact from the tracer gas and within an acceptable acquisition time. Specific aspects of the tomographic reconstruction and the experimental procedure are examined, with particular emphasis on the quantification of experimental uncertainties. A method is developed to determine density and temperature from the X-ray attenuation measurements. These experiments are complemented by one-and multidimensional calculations to quantify the influence of krypton on the flame behavior. To demonstrate the merit of XCT for optically inaccessible flames, measurements of a complex flame geometry in a tubular confinement are performed. The use of a coflow to provide a uniform tracergas concentration is shown to improve the quantitative temperature evaluation. These measurements demonstrate the viability of XCT for flame-structure analysis and multidimensional temperature measurements using laboratory X-ray systems. Further opportunities for improving this diagnostic are discussed.

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