20-kHz-rate three-dimensional tomographic imaging of the concentration field in a turbulent jet

Halls, Benjamin R.; Gord, James R.; Meyer, Terrence R.; Thul, Daniel; Slipchenko, Mikhail N.; Roy, Sukesh

doi:10.1016/j.proci.2016.07.007

Cited by 37 publications

(7 citation statements)

References 29 publications

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“…OH 45,47,48 or CH 44,46 radicals can be targeted, or tracer dyes like acetone or iodine. 41–43 When comparing a computed section with conventional 2D laser-induced fluorescence (LIF), very similar results are obtained as shown by Wu et al 41 and Ma et al, 44 demonstrating the reliability of vLIF under certain conditions. CT has also been applied to chemiluminescence imaging with very similar results.…”

Section: Introductionsupporting

confidence: 63%

“…Similar to the non-tomographic techniques described earlier, the signal used to characterize the sample can come from many sources. In recent years, various groups have studied volumetrically illuminated laser-induced incandescence (LII) 40 and volumetric laser-induced fluorescence (vLIF) 41–47 thoroughly. The whole volume is illuminated with laser light and since fluorescence (and incandescence) emission is unidirectional, the signal is collected from various detectors placed around the sample.…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal flame mapping in a large-bore marine diesel engine using multiple high-speed cameras

Hult

Matamis²,

Baudoin

et al. 2019

International Journal of Engine Research

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A calibrated multiple high-speed camera arrangement recording the flame emission from three different directions has been demonstrated on an engine. From the multiple views, the flame position inside the engine cylinder can be spatially mapped, allowing quantitative studies of the dynamics of ignition, flame development and propagation. Through space carving, the three-dimensional flame contour can be estimated. From this contour, properties like flame length, flame height, ignition locations and flame directions can be extracted. The technique is demonstrated by measurements on diesel flames inside a marine two-stroke engine with a bore diameter of 500 mm. It is found to be a valuable tool for spatiotemporal flame mapping in this asymmetric industrial combustion system.

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Section: Introductionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Spatiotemporal flame mapping in a large-bore marine diesel engine using multiple high-speed cameras

Hult

Matamis²,

Baudoin

et al. 2019

International Journal of Engine Research

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“…Such capabilities with high-energy and high-bandwidth lasers would be extremely useful for investigating transient and turbulent flows. These capabilities could be further extended to 3D measurements and to 4D with temporal evolution recorded [111,112].…”

Section: Comparison Of Ns Ps and Fs-laser-based Imaging-their Similmentioning

confidence: 99%

Recent advances in ultrafast-laser-based spectroscopy and imaging for reacting plasmas and flames

Patnaik

Adamovich

Gord

et al. 2017

Plasma Sources Sci. Technol.

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Reacting flows and plasmas are prevalent in a wide array of systems involving defense, commercial, space, energy, medical, and consumer products. Understanding the complex physical and chemical processes involving reacting flows and plasmas requires measurements of key parameters, such as temperature, pressure, electric field, velocity, and number densities of chemical species. Time-resolved measurements of key chemical species and temperature are required to determine kinetics related to the chemical reactions and transient phenomena. Laser-based, noninvasive linear and nonlinear spectroscopic approaches have proved to be very valuable in providing key insights into the physico-chemical processes governing reacting flows and plasmas as well as validating numerical models. The advent of kilohertz rate amplified femtosecond lasers has expanded the multidimensional imaging of key atomic species such as H, O, and N in a significant way, providing unprecedented insight into preferential diffusion and production of these species under chemical reactions or electric-field driven processes. These lasers not only provide 2D imaging of chemical species but have the ability to perform measurements free of various interferences. Moreover, these lasers allow 1D and 2D temperature-field measurements, which were quite unimaginable only a few years ago. The rapid growth of the ultrafast-laser-based spectroscopic measurements has been fueled by the need to achieve the following when measurements are performed in reacting flows and plasmas. They are: (1) interference-free measurements (collision broadening, photolytic dissociation, Stark broadening, etc), (2) timeresolved single-shot measurements at a rate of 1-10 kHz, (3) spatially-resolved measurements, (4) higher dimensionality (line, planar, or volumetric), and (5) simultaneous detection of multiple species. The overarching goal of this article is to review the current state-of-the-art ultrafast-laserbased spectroscopic techniques and their remarkable development in the past two decades in meeting one or all of the above five goals for the spectroscopic measurement of temperature, number density of the atomic and molecular species, and electric field.

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“…Moreover, tomographic imaging in turbulent mixing jets has been demonstrated using acetone Tomo-LIF in single-shot [32] and high-speed [33] measurements. LIF signals from the multiple views were processed applying the multiplicative algebraic reconstruction technique (MART) [17].…”

Section: Tomographic Imaging Of Oh Laser-induced Fluorescence In Lami...mentioning

confidence: 99%

Tomographic imaging of OH laser-induced fluorescence in laminar and turbulent jet flames

Pareja

Fuest

et al. 2017

Meas. Sci. Technol.

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In this paper a new approach for 3D flame structure diagnostics using tomographic laserinduced fluorescence (Tomo-LIF) of the OH radical was evaluated. The approach combined volumetric illumination with a multi-camera detection system of eight views. Single-shot measurements were performed in a methane/air premixed laminar flame and in a nonpremixed turbulent methane jet flame. 3D OH fluorescence distributions in the flames were reconstructed using the simultaneous multiplicative algebraic reconstruction technique. The tomographic measurements were compared and validated against results of OH-PLIF in the laminar flame. The effects of the experimental setup of the detection system and the size of the volumetric illumination on the quality of the tomographic reconstructions were evaluated. Results revealed that the Tomo-LIF is suitable for volumetric reconstruction of flame structures with acceptable spatial resolution and uncertainty. It was found that the number of views and their angular orientation have a strong influence on the quality and accuracy of the tomographic reconstruction while the illumination volume thickness influences mainly the spatial resolution.

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20-kHz-rate three-dimensional tomographic imaging of the concentration field in a turbulent jet

Cited by 37 publications

References 29 publications

Spatiotemporal flame mapping in a large-bore marine diesel engine using multiple high-speed cameras

Spatiotemporal flame mapping in a large-bore marine diesel engine using multiple high-speed cameras

Recent advances in ultrafast-laser-based spectroscopy and imaging for reacting plasmas and flames

Tomographic imaging of OH laser-induced fluorescence in laminar and turbulent jet flames

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