Quantitative three-dimensional imaging of soot volume fraction in turbulent non-premixed flames

Hult, Johan; Omrane, Alaa; Nygren, Jenny; Kaminski, Clemens F.; Axelsson, Boman; Collin, Robert; Bengtsson, Per-Erik; Aldén, Marcus

doi:10.1007/s00348-002-0410-2

Cited by 63 publications

(31 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Possible options that can potentially meet both the spatial and temporal requirements seem to be very limited and most of the existing efforts can be broadly divided into two categories [3,4]. The first category of techniques obtains 3D measurements by rapidly scanning a planar imaging technique such as Mie scattering [5] or laser induced incandescence [6]. The second category of techniques obtains 3D measurements volumetrically by performing a 3D tomography [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging

Cai

2013

Appl. Opt.

View full text Add to dashboard Cite

Instantaneous three-dimensional (3D) measurements have been long desired to resolve the spatial structures of turbulent flows and flame. Previous efforts have demonstrated tomography as a promising technique to enable such measurements. To facilitate the practical application, this work investigated four practical aspects for implementing 3D tomographic under the context of volumetric combustion diagnostics. Both numerical simulations and controlled experiments were performed to study: (1) the termination criteria of the inversion algorithm; (2) the effects of regularization and the determination of the optimal regularization factor; (3) the effects of a number of views; and (4) the impact of the resolution of the projection measurements. The results obtained have illustrated the effects of these practical aspects on the accuracy and spatial resolution of volumetric tomography. Furthermore, all these aspects are related to the complexity and implementing cost (both hardware cost and computational cost). Therefore, the results obtained in this work are expected to be valuable for the design and implementation of practical 3D diagnostics.

show abstract

Section: Introductionmentioning

confidence: 99%

Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging

Cai

2013

Appl. Opt.

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%

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

Lei

et al. 2016

Combustion and Flame

View full text Add to dashboard Cite

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.

show abstract

“…Possible strategies seem to be very limited and existing efforts can be broadly divided into two categories [2,3]. The first category of techniques obtains 3D measurements by rapidly scanning a 2D technique, any 2D technique (at least conceptually) such as planar Mie scattering [4], planar laser induced incandescence [5], or even 2D absorption-based tomography [6,7]. The second category of techniques obtains 3D measurements volumetrically by performing a 3D tomography [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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

Li¹,

Ma²

2014

Opt. Express

View full text Add to dashboard Cite

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.

show abstract

Quantitative three-dimensional imaging of soot volume fraction in turbulent non-premixed flames

Cited by 63 publications

References 14 publications

Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging

Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging

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

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

Contact Info

Product

Resources

About