Computed Tomography of Chemiluminescence (CTC): Instantaneous 3D measurements and Phantom studies of a turbulent opposed jet flame

Floyd, J.; Geipel, Philipp; Kempf, Andreas

doi:10.1016/j.combustflame.2010.09.006

Cited by 171 publications

(85 citation statements)

References 73 publications

(99 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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]. These two strategies have both fundamental differences (in terms of spatial resolution, temporal resolution, field of view, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Yet the TC technique offers the prospect of measuring many critical flame quantities that are very challenging for other diagnostics, including the rate of heat release [12], local equivalence ratio [13], and flame topography [14]. These quantities are of great value for the development and validation of advanced models [9,15]. Such prospective capabilities have motivated several investigations on the use of TC for volumetric combustion measurements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Section: Introductionmentioning

confidence: 99%

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

show abstract

“…It was firstly developed by Gordon [13] to solve the 3D reconstruction problem from projection of electron microscopy and radiology, and has been modified into many different forms. Here we utilized an additive version of ART, which has been adopted by Flord [9] :…”

Section: Fundamentals Of Reconstruction By Projectionsmentioning

confidence: 99%

“…Based on different imaging system, 3D-CTC can be divided into three categories [3] . The first category obtains the image projection by custom-made lens and film [8] , the second method based on lens and CCD cameras [4,9,10] , and the third method combined fiber-based endoscopes(FBEs) with multi-CCD to get the multi-direction projections [11,12] . …”

mentioning

confidence: 99%

Computed tomography measurement of 3D combustion chemiluminescence using single camera

Wang¹,

Li²,

Zeng³

et al. 2016

Optical Measurement Technology and Instrumentation

View full text Add to dashboard Cite

Instantaneous measurement of flame spatial structure has been long desired for complicated combustion condition (gas turbine, ramjet et.). Three dimensional computed tomography of chemiluminescence (3D-CTC) is a potential testing technology for its simplicity, low cost, high temporal and spatial resolution. In most former studies, multi-lens and multi-CCD are used to capture projects from different view angles. In order to improve adaptability, only one CCD was utilized to build 3D-CTC system combined with customized fiber-based endoscopes (FBEs). It makes this technique more economic and simple. Validate experiments were made using 10 small CH4 diffusion flame arranging in a ring structure. Based on one instantaneous image, computed tomography can be conducted using Algebraic Reconstruction Technique (ART) algorithm. The reconstructed results, including the flame number, ring shape of the flames, the inner and outer diameter of ring, all well match the physical structure. It indicates that 3D combustion chemiluminescence could be well reconstructed using single camera. Three dimensional computed tomography of chemiluminescence (3D-CTC), radicals, reconstruction, AlgebraicReconstruction Technique (ART) 1.IntroductionChemiluminescence of flame are the emitted photons caused by the transition of excited-states radicals to ground-states. It is recognized as an important indictor in combustion diagnostics and control [1][2][3] . Compared with laser diagnostics, 3D-CTC is substantially simpler and easier to implement, also can provide information about key combustion quantities (e.g., heat release rate, local equivalence ratio) [4] , making it attractive for applications in harsh industrial environments. Chemiluminescence of flame have been studied for more than one century, and the first approach of measurement by designing a collection system to detect relatively small volume was demonstrated in 1991 [5] . Cassegrain telescope optics subsequently have been utilized for non-intrusive measurement [6,7] . Multiple dimension measurement could be accomplished by rapid scanning the focusing plane if the target flame is steady. This method can not resolve the temporal dynamics of the combustion processes. The second approach for multiple dimension measurement is 3D-CTC technique combining chemiluminescence with tomography to obtain spatially-resolved measurements, which can provide more directly and critical structural information. Nonetheless, high spatial resolution and rapid temporal resolution measurement is a tremendous challenge for 3D-CTC technique due to the limits of optical access and hardware. In recent years, 3D-CTC have been widely studied due to the great improvements of capabilities of optical sensing and computing technologies. Based on different imaging system, 3D-CTC can be divided into three categories [3] . The first category obtains the image projection by custom-made lens and film [8] , the second method based on lens and CCD cameras [4,9,10] , and the third method combined fiber-based endosc...

show abstract

“…By analyzing the object points beyond the focal plane, an improved accuracy of the tomographic reconstruction was achieved. In many practical cases, however, the flame projections are generally formed by stacked fan-beams [9][10][11] or cone-beams [12,13]. The assumption of the parallel-beams will result in a reduced accuracy in the flame reconstruction, particularly for the flame area which is away from the optical axis.…”

Section: Introductionmentioning

confidence: 99%

3-D reconstruction of an axisymmetric flame based on cone-beam tomographic algorithms

Lü

Yan

2016

2016 10th International Conference on Sensing Technology (ICST)

View full text Add to dashboard Cite

Computed Tomography of Chemiluminescence (CTC): Instantaneous 3D measurements and Phantom studies of a turbulent opposed jet flame

Cited by 171 publications

References 73 publications

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

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

Computed tomography measurement of 3D combustion chemiluminescence using single camera

3-D reconstruction of an axisymmetric flame based on cone-beam tomographic algorithms

Contact Info

Product

Resources

About