Time-resolved measurements of supersonic fuel sprays using synchrotron X-rays

Powell, Christopher F.; Yue, Yong; Poola, Ramesh B.; Wang, Jin

doi:10.1107/s0909049500013431

Cited by 65 publications

(45 citation statements)

References 9 publications

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“…1(b)] to the path-length-integrated liquid density along the path of the xray beam. X-ray radiography, for example, has been demonstrated with high spatial resolution and signal-to-noise ratio in studies of liquid injection into gaseous environments using line-ofsight x-ray attenuation [14][15][16]. More specifically, studies of overall quantitative liquid distributions in impinging jets have recently been demonstrated [17].…”

Section: Introductionmentioning

confidence: 99%

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Halls¹,

Meyer²,

Kastengren³

2015

Opt. Express

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The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadrupletracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using stereographic reconstruction of x-ray attenuation along multiple lines of sight. The proposed methodology addresses the need for a quantitative measurement technique capable of interrogating optically complex, nearfield liquid distributions in many mixing systems of practical interest involving two or more liquid streams. RightsThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be be found at the following URL on the OSA website: https://www.osapublishing.org/search.cfm?q=&j=oe&v=23&i=2&p=1730. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means in prohibited and is subject to penalties under law. Abstract:The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadruple-tracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using stereographic reconstruction of x-ray attenuation along multiple lines of sight. The proposed methodology addresses the need for a quantitative measurement technique capable of interrogating optically complex, near-field liquid distributions in many mixing systems of practical interest involving two or more liquid streams.

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Section: Introductionmentioning

confidence: 99%

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Halls¹,

Meyer²,

Kastengren³

2015

Opt. Express

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“…Compared to other experimental solutions also capable of diminishing the scattered light for line-of-sight detection, such as Ballistic imaging [2] and X-ray imaging [10,11], the current technique suppresses this undesired intensity contribution after image acquisition, limiting it to less optically dense media. However, the method is compatible with other filtering approaches, such as temporal-, spatial-and polarization filtering (as utilized for Ballistic imaging), which could increase the range of applicability even further.…”

Section: Resultsmentioning

confidence: 99%

“…Another way to avoid multiple light scattering is to use X-rays instead of visible light. In this case, scattering becomes negligible, allowing the spray to be characterized by measuring line-of-sight absorption [10]. However, it should be noted that to obtain measurable levels of absorption it is often required to add absorbers to the injected liquid.…”

Section: Introductionmentioning

confidence: 99%

Quantitative 3D imaging of scattering media using structured illumination and computed tomography

Kristensson¹,

Berrocal²,

Aldén³

2012

Opt. Express

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Abstract:An imaging technique capable of measuring the extinction coefficient in 3D is presented and demonstrated on various scattering media. The approach is able to suppress unwanted effects due to both multiple scattering and light extinction, which, in turbid situations, seriously hampers the performance of conventional imaging techniques. The main concept consists in illuminating the sample of interest with a light source that is spatially modulated in both the vertical and horizontal direction and to measure, using Structured Illumination, the correct transmission in 2D at several viewing angles. The sample is then reconstructed in 3D by means of a standard Computed Tomography algorithm. To create the adequate illumination, a novel "crossed" structured illumination approach is implemented. In this article, the accuracy and limitation of the method is first evaluated by probing several homogeneous milk solutions at various levels of turbidity. The unique possibility of visualizing an object hidden within such solutions is also demonstrated. Finally the method is applied on two different inhomogeneous scattering spray systems; one transient and one quasi-steady state.

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“…Face à l'inexistence de techniques de diagnostic fiables pour la caractérisation de l'écoulement sur des distances d'une longueur correspondant à quelques diamètres de l'orifice de l'injecteur, le développement des dispositifs a longtemps reposé sur les résultats issus des travaux de modélisation. Depuis quelques années, l'utilisation du rayonnement X, sur la gamme d'énergie appropriée autour de 10 keV, a permis d'obtenir les premières cartographies, mesures de densité et de vitesse de propagation des sprays de carburant [1][2][3][4]. Ces premières mesures effectuées en exploitant la mono chromaticité et la grande résolution spatiale offertes par l'utilisation du rayonnement synchrotron ont permis de vérifier toute l'importance de recueillir des données de base pour les travaux de simulations.…”

Section: Introductionunclassified

Diagnostic de sprays diesel par radiographie X

Robert

Dozias

Viladrosa

et al. 2011

UVX 2010 - 10e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X ; Applications Et Développements Récents

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Résumé. Le travail présente la mise en oeuvre d'un diagnostic à base de rayons X vers 8 keV pour la caractérisation spatiale et temporelle dans la zone proche orifice, c'est-à-dire la région la plus dense, de sprays de diesel issus d'injecteur de série. Les principales propriétés de la source flash X sont décrites, domaine d'énergie, résolution spatiale, et géométrie de l'expérience de radiographie. Le principe et la précision de la mesure de densité des jets de carburant sont validés sur des objets tests. Les mesures traduisent l'existence de deux zones de densités et vitesse de propagation différentes sur les premières centaines de micromètre en aval de l'injecteur ainsi qu'un mélange relativement important du carburant liquide avec l'atmosphère gazeuse dans la chambre d'injection.

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Time-resolved measurements of supersonic fuel sprays using synchrotron X-rays

Cited by 65 publications

References 9 publications

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Quantitative 3D imaging of scattering media using structured illumination and computed tomography

Diagnostic de sprays diesel par radiographie X

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