Time-resolved (kHz) 3D imaging of OH PLIF in a flame

Wellander, Rikard; Richter, Mattias; Aldén, Marcus

doi:10.1007/s00348-014-1764-y

Cited by 56 publications

(27 citation statements)

References 32 publications

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“…One possible approach of such extension is a scanning PLIF (planar laser induced fluorescence) technique, in which the excitation laser sheet used in the PLIF technique was scanned across multiple spatial locations sequentially, and then the 2D measurements obtained at these locations were stacked together to form a 3D measurement [12][13][14][15][16]. Even though this approach was conceptually straightforward and has been explored earlier [12,17], it is not trivial to obtain quantitative measurements with sufficient temporal and spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

“…Even though this approach was conceptually straightforward and has been explored earlier [12,17], it is not trivial to obtain quantitative measurements with sufficient temporal and spatial resolution. Even with the latest advancement in high repetition rate lasers, high frame rate cameras, and the corresponding optics and electronics, measurements following the scanning approach have been limited to a temporal resolution of 1 kHz and a spatial resolution on the order of 1 mm in the direction of the scanning [14][15][16]. Higher spatiotemporal resolutions are desired or required for many flows of practical interest [18].…”

Section: Introductionmentioning

confidence: 99%

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Single-shot volumetric laser induced fluorescence (VLIF) measurements in turbulent flows seeded with iodine

Wu¹,

Xu²,

Lei³

et al. 2015

Opt. Express

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This work reports the experimental demonstration of single-shot visualization of turbulent flows in all three spatial dimensions (3D) based on volumetric laser induced fluorescence (VLIF). The measurements were performed based on the LIF signal of iodine (I 2 ) vapor seeded in the flow. In contrast to established planar LIF (PLIF) technique, the VLIF technique excited the seeded I 2 vapor volumetrically by a thick laser slab. The volumetric LIF signals emitted were then simultaneously collected by a total of five cameras from five different orientations, based on which a 3D tomographic reconstruction was performed to obtain the 3D distribution of the I 2 vapor in the target flow. Single-shot measurements (with a measurement duration of a few ns) were demonstrated in a 50 mm × 50 mm × 50 mm volume with a nominal spatial resolution of 0.42 mm and an actual resolution of ~0.71 mm in all three dimensions (corresponding to a total of 120 × 120 × 120 voxels). 249-256 (1996). 18. M. Zhang, J. Wang, W. Jin, Z. Huang, H. Kobayashi, and L. Ma, "Estimation of 3D flame surface density and global fuel consumption rate from 2D PLIF images of turbulent premixed flame," Combust.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-shot volumetric laser induced fluorescence (VLIF) measurements in turbulent flows seeded with iodine

Wu¹,

Xu²,

Lei³

et al. 2015

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Approaches in the first category involve the scanning of a planar technique to obtain a series of 2D measurements sequentially, and these 2D measurements can then be combined to form an effectively instantaneous volumetric measurement when the scanning is performed rapidly. Demonstrations have been performed to obtain 3D measurements by the scanning of the laser sheet for PLIF [11][12][13] , planar Mie scattering [14] , and planar laser-induced incandescence [15] . With current high-repetition-rate lasers and scanning technologies, 3D measurements with temporal resolution near 1 kHz and a spatial resolution on the order of 1 mm in the direction http of scanning [11][12][13] are feasible.…”

Section: Introductionmentioning

confidence: 99%

“…Demonstrations have been performed to obtain 3D measurements by the scanning of the laser sheet for PLIF [11][12][13] , planar Mie scattering [14] , and planar laser-induced incandescence [15] . With current high-repetition-rate lasers and scanning technologies, 3D measurements with temporal resolution near 1 kHz and a spatial resolution on the order of 1 mm in the direction http of scanning [11][12][13] are feasible. Multiple lasers can potentially be used to improve the temporal and spatial resolution at the cost of complexity and capital investment [15] .…”

Section: Introductionmentioning

confidence: 99%

3D flame topography and curvature measurements at 5 kHz on a premixed turbulent Bunsen flame

Lei

et al. 2016

Combustion and Flame

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a b s t r a c tThis work reports the measurements of three-dimensional (3D) flame topography and curvature of a premixed turbulent Bunsen flame at a rate of 5 kHz, using a technique combining chemiluminescence and tomography. Line-of-sight images of chemiluminescence (termed projections ) of the target flame were recorded by six cameras from different orientations simultaneously at 5 kHz. Based on these projections, a tomography algorithm reconstructed the 3D flame structure, based on which 3D curvature was then calculated. Due to the 3D nature of the data, statistics of flame properties can then be extracted both in temporal and spatial domains. Probability density function (PDF) of flame topography was extracted from a series of 3D measurements, and the PDFs of the flame at different spatial locations were examined. Furthermore, the instantaneously measured 3D flame topography also enabled the calculation of 3D flame curvature (or 2D curvature along an arbitrary orientation). The PDFs of curvature in 2D and 3D were then extracted and compared. These results provide quantification of the flame surface shape in 3D (cylindrical, elliptic, or hyperbolic), illustrating the utility of 3D diagnostics to fully resolve the dynamics of turbulent flames.

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“…Progress towards volumetrically resolved measurements in combustion processes were achieved through a combination of tomographic particle image velocimetry (PIV) [14] and flame front measurements [10,15], as well as a single-camera particle tracking technique for small-scale measurements [16]. Recently, fast-scanning setups have enabled the 3D imaging of structures [17,18], including those revealed from hydroxyl radicals through laser-induced fluorescence [19,20]. Common to all these studies is either the usage of multiple cameras or the assembly of quasi-3D images from sequences of images taken successively in various planes by rapidly scanning a laser light sheet across the object.…”

Section: Introductionmentioning

confidence: 99%

Plenoptic Single-Shot 3D Imaging of In-Cylinder Fuel Spray Geometry

Lillo

Greene

Sick

2014

Zeitschrift Für Physikalische Chemie

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Progress in understanding turbulent combustion requires access to information that is derived from instantaneous 3D images showing the contours of the flame front, the flow field, and other quantities. The experimental effort to acquire such information is typically extraordinarily high and therefore not as widely used as needed. The introduction of commercially available plenoptic cameras now provides a means to simplify some of these measurements as is described in this study. A single 29 mega-pixel plenoptic camera was used to record the Mie scattering signals from volumetrically illuminated fuel sprays. Instantaneous 3D images were acquired from within the cylinder of an optically accessible engine for three automotive fuel injectors of differing nominal spray angles. Current reconstruction algorithms do not yet take translucent imaging conditions into account and therefore a quantitative analysis of the full 3D structure of the sprays was not possible. However, the plenoptic system did prove capable of accurately reconstructing bulk spray features such as spray angles. The 3D spray images were validated with data from a conventional 2D imaging system. This study demonstrates the feasibility of using a single plenoptic camera to view spray geometry in 3D, even from within the challenging in-cylinder engine environment.

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Time-resolved (kHz) 3D imaging of OH PLIF in a flame

Cited by 56 publications

References 32 publications

Single-shot volumetric laser induced fluorescence (VLIF) measurements in turbulent flows seeded with iodine

Single-shot volumetric laser induced fluorescence (VLIF) measurements in turbulent flows seeded with iodine

3D flame topography and curvature measurements at 5 kHz on a premixed turbulent Bunsen flame

Plenoptic Single-Shot 3D Imaging of In-Cylinder Fuel Spray Geometry

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