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Special Issue "Tomographic and Volumetric Diagnostics in Flames"

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A special issue of Energies (ISSN 1996-1073).

Deadline for manuscript submissions: closed (31 January 2021).

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Special Issue Editors

Prof. Dr. Khadijeh Mohri
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Guest Editor

Institute for Combustion and Gas Dynamics (IVG), Fluid Dynamics, University of Duisburg-Essen, 47047 Duisburg, Germany
Interests: tomographic techniques in energy- and process-technology; flame tomography; evolutionary reconstruction techniques (ERT); background-oriented schlieren tomography; multi-simultaneous measurements

Prof. Dr. Andreas M. Kempf
E-Mail Website
Guest Editor

Institute for Combustion and Gas Dynamics (IVG), Fluid Dynamics, University of Duisburg-Essen, 47047 Duisburg, Germany
Interests: flame tomography; large-eddy simulation of combustion; direct numerical simulation of flames; nano-particle synthesis; modelling

Special Issue Information

Dear Colleagues,

Stringent regulations concerning pollutant and greenhouse gas emissions, safety and cost concerns, and fuel load and stability issues all call for the need to improve combustion devices. This can only be achieved with an in-depth understanding of realistic flames, which, in most cases, are turbulent. A fundamental understanding of such flames, as well as advanced numerical simulations, require experimental data that should ideally be time-resolved and volumetric, due to the inherent unsteadiness and three-dimensionality of the flames.

With this Special Issue, we aim to present recent work on tomographic and volumetric imaging in flames. We advise that papers should not exceed 12 pages in length. Review papers are also welcome, but please contact us if you plan to prepare one.

Prof. Dr. Khadijeh Mohri
Prof. Dr.-Ing. Andreas M. Kempf
Guest Editors

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Keywords

Flame tomography
Extracting quantitative information from flame reconstructions
Phantom study strategies for tomography algorithm development
Novel tomography algorithms
High accuracy camera calibration methods
Laser-based techniques
Light field imaging
Time-resolved data
High resolution data
Industrial applications
Thermo-acoustics applications
Methods for the analysis of volumetric data

Published Papers (4 papers)

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Research

Open AccessArticle

Two-Dimensional Tomographic Simultaneous Multispecies Visualization—Part II: Reconstruction Accuracy

Thomas Häber

Rainer Suntz

and

Henning Bockhorn

Energies 2020, 13(9), 2368; https://doi.org/10.3390/en13092368 - 09 May 2020

Cited by 3 | Viewed by 676

Abstract

Recently we demonstrated the simultaneous detection of the chemiluminescence of the radicals OH* (310 nm) and CH* (430 nm), as well as the thermal radiation of soot in laminar and turbulent methane/air diffusion flames. As expected, a strong spatial and temporal coupling of OH* and CH* in laminar and moderate turbulent flames was observed. Taking advantage of this coupling, multispecies tomography enables us to quantify the reconstruction quality completely independent of any phantom studies by simply utilizing the reconstructed distribution of both species. This is especially important in turbulent flames, where it is difficult to separate measurement noise from turbulent fluctuations. It is shown that reconstruction methods based on Tikhonov regularization should be preferred over the widely used algebraic reconstruction technique (ART) and multiplicative algebraic reconstruction techniques (MART), especially for high-speed imaging or generally in the limit of low signal-to-noise ratio. Full article

(This article belongs to the Special Issue Tomographic and Volumetric Diagnostics in Flames)

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Open AccessArticle

Two-Dimensional Tomographic Simultaneous Multi-Species Visualization—Part I: Experimental Methodology and Application to Laminar and Turbulent Flames

Thomas Häber

Henning Bockhorn

and

Rainer Suntz

Energies 2020, 13(9), 2335; https://doi.org/10.3390/en13092335 - 07 May 2020

Cited by 3 | Viewed by 806

Abstract

In recent years, the tomographic visualization of laminar and turbulent flames has received much attention due to the possibility of observing combustion processes on-line and with high temporal resolution. In most cases, either the spectrally non-resolved flame luminescence or the chemiluminescence of a single species is detected and used for the tomographic reconstruction. In this work, we present a novel 2D emission tomographic setup that allows for the simultaneous detection of multiple species (e.g., OH*, CH* and soot but not limited to these) using a single image intensified CCD camera. We demonstrate the simultaneous detection of OH* (310 nm), CH* (430 nm) and soot (750 nm) in laminar methane/air, as well as turbulent methane/air and ethylene/air diffusion flames. As expected, the reconstructed distributions of OH* and CH* in laminar and turbulent flames are highly correlated, which supports the feasibility of tomographic measurements on these kinds of flames and at timescales down to about 1 ms. In addition, the possibilities and limitations of the tomographic approach to distinguish between locally premixed, partially premixed and non-premixed conditions, based on evaluating the local intensity ratio of OH* and CH* is investigated. While the tomographic measurements allow a qualitative classification of the combustion conditions, a quantitative interpretation of instantaneous reconstructed intensities (single shot results) has a much greater uncertainty. Full article

(This article belongs to the Special Issue Tomographic and Volumetric Diagnostics in Flames)

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Graphical abstract

Open AccessFeature PaperArticle

Axisymmetric Linear Hyperspectral Absorption Spectroscopy and Residuum-Based Parameter Selection on a Counter Flow Burner

and

Energies 2019, 12(14), 2786; https://doi.org/10.3390/en12142786 - 19 Jul 2019

Cited by 9 | Viewed by 1002

Abstract

Chemical species tomography enables non-invasive measurements of temperatures and concentrations in gas phase processes. In this work, we demonstrate the recently introduced linear hyperspectral absorption tomography (LHAT) on an axisymmetric counterflow burner used for speciation studies of Oxyfuel combustion. As LHAT reconstructs spectrally resolved local absorption coefficient spectra, the physical plausibility of these reconstructed spectra degrades with an over-regularization of the tomographic problem. As presented in this work, this behavior can be employed in a novel regularization parameter choice method based on the residuals of local spectroscopic fits to the reconstructed spectra. After determining the regularization parameter, the reconstructions of the temperature and water mole fraction profiles of different flames are compared to numerical simulations, showing a good agreement. Full article

(This article belongs to the Special Issue Tomographic and Volumetric Diagnostics in Flames)

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Graphical abstract

Open AccessArticle

3D Evolutionary Reconstruction of Scalar Fields in the Gas-Phase

Andreas Unterberger

Andreas Kempf

and

Khadijeh Mohri

Energies 2019, 12(11), 2075; https://doi.org/10.3390/en12112075 - 30 May 2019

Cited by 8 | Viewed by 2073

Abstract

An evolutionary reconstruction technique (ERT) was developed for three-dimensional (3D) reconstruction of luminescent objects, in particular turbulent flames for the first time. The computed tomography (CT) algorithm is comprised of a genetic algorithm (GA) and a ray-tracing software. To guide the reconstruction process, a mask is introduced. It uses a Metropolis algorithm (MA) to sample locations where specific genetic operators can be applied. Based on an extensive parameter study, performed on several types of phantoms, the ability of our algorithm for 3D reconstructions of fields with varying complexities is demonstrated. Furthermore, it was applied to three experiments, to reconstruct the instantaneous chemiluminescence field of a bunsen flame, a highly turbulent swirl flame and the turbulent Cambridge-Sandia stratified flame. Additionally, we show direct and quantitative comparison to an advanced computed tomography of chemiluminescence (CTC) method that is based on an algebraic reconstruction technique (ART). The results showed good agreement between CTC and ERT using both phantom data from flame simulations, and experimental data. Full article

(This article belongs to the Special Issue Tomographic and Volumetric Diagnostics in Flames)

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Special Issue "Tomographic and Volumetric Diagnostics in Flames"

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