Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals

Hunger, Franziska; Zulkifli, Meor Faisal; Williams, B. A. O.; Beyrau, Frank; Hasse, Christian

doi:10.1016/j.proci.2016.06.183

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…For the chemistry manifolds, the signals are incorporated in the FLUT as a function of progress variable and enthalpy. OH (Popp et al 2015;Hunger et al 2017) and CH 2 O-LIF (Popp et al 2015) computed signals were used previously. Within these studies a detailed description of the underlying method is given.…”

Section: Co-simulation Of Computed Signalsmentioning

confidence: 99%

Numerical Investigation of Local Heat-Release Rates and Thermo-Chemical States in Side-Wall Quenching of Laminar Methane and Dimethyl Ether Flames

Steinhausen

Luo

Popp

et al. 2020

Flow Turbulence Combust

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The local heat-release rate and the thermo-chemical state of laminar methane and dimethyl ether flames in a side-wall quenching configuration are analyzed. Both, detailed chemistry simulations and reduced chemistry manifolds, namely Flamelet-Generated Manifolds (FGM), Quenching Flamelet-generated Manifolds (QFM) and Reaction-Diffusion Manifolds (REDIM), are compared to experimental data of local heat-release rate imaging of the lab-scale side-wall quenching burner at Technical University of Darmstadt. To enable a direct comparison between the measurements and the numerical simulations, the measurement signals are computed in all numerical approaches. Considering experimental uncertainties, the detailed chemistry simulations show a reasonable agreement with the experimental heat-release rate. The comparison of the FGM, QFM and REDIM with the detailed simulations shows the high prediction quality of the chemistry manifolds. For the first time, the thermo-chemical state during quenching of a dimethyl ether-air flame is examined numerically. Therefore, the carbon monoxide and temperature predictions are analyzed in the vicinity of the wall. The obtained results are consistent with previous studies for methane-air flames and extend these findings to more complex oxygenated fuels. Furthermore, this work presents the first comparison of the QFM and the REDIM in a side-wall quenching burner.

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Section: Co-simulation Of Computed Signalsmentioning

confidence: 99%

Numerical Investigation of Local Heat-Release Rates and Thermo-Chemical States in Side-Wall Quenching of Laminar Methane and Dimethyl Ether Flames

Steinhausen

Luo

Popp

et al. 2020

Flow Turbulence Combust

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“…The model constant is determined using the dynamic procedure [63]. The suitability of the LES-FPV numerical framework for turbulent jet flames was previously shown in [64][65][66][67]. The Favre-filtered transport equations of the mixture fraction and progress variable are given by…”

Section: Combustion Modelmentioning

confidence: 99%

Soot particle size distribution reconstruction in a turbulent sooting flame with the split-based extended quadrature method of moments

et al. 2022

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The Method of Moments (MOM) has largely been applied to investigate sooting laminar and turbulent flames. However, the classical MOM is not able to characterize a continuous particle size distribution (PSD). Without access to information on the PSD, it is difficult to accurately take into account particle oxidation, which is crucial for shrinking and eliminating soot particles. Recently, the Split-based Extended Quadrature Method of Moments (S-EQMOM) has been proposed as a numerically robust alternative to overcome this issue (Salenbauch et al., 2019). The main advantage is that a continuous particle number density function can be reconstructed by superimposing kernel density functions (KDF). Moreover, the S-EQMOM primary nodes are determined individually for each KDF, improving the moment realizability. <p>In this work, the S-EQMOM is combined with a Large Eddy Simulation/presumed-PDF flamelet/progress variable approach for predicting soot formation in the Delft Adelaide Flame III. The target flame features low/high sooting propensity/intermittency and comprehensive flow/scalar/soot data are available for model validation. Simulation results are compared with the experimental data for both the gas phase and the particulate phase. A good quantitative agreement has been obtained especially in terms of the soot volume fraction. The reconstructed PSD reveals predominantly unimodal/bimodal distributions in the first/downstream portion of this flame, with particle diameters smaller than 100 nm. By investigating the instantaneous and statistical sooting behavior at the flame tip, it has been found that the experimentally observed soot intermittency is linked to mixture fraction fluctuations around its stoichiometric value that exhibit a bimodal probability density function.

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“…Planar laser-induced fluorescence (PLIF) technique has the advantages of obtaining non-contact measurements and high sensitivity, high spatial resolution, and high temporal resolution in combustion measurements, and PLIF for the OH radical (OH-PLIF) is widely used in the combustion research. − As a fundamental radical in the flame, the OH radical is an intermediate component produced in most combustion processes, and the distribution of OH radicals can characterize the spatial distribution of the flame front and the concentration level of the OH radical can represent the combustion intensity.…”

Section: Introductionmentioning

confidence: 99%

OH-Planar Laser-Induced Fluorescence Measurements in Laminar Diffusion Flames of n-Heptane with Coflow Air Diluted by N₂ and CO₂

Huang

Wang

et al. 2021

ACS Omega

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The distribution of hydroxyl (OH) radicals in the laminar diffusion flame of n-heptane was studied by planar laser-induced fluorescence (PLIF). The influences of nitrogen (N2) and carbon dioxide (CO2) dilution on the formation and distribution of OH radicals were analyzed. The corresponding dilution ratios (volume fractions) of both N2 and CO2 vary from 0 to 5%. The results show that for the n-heptane flame, the OH radical is mainly concentrated in the two wings of the flame, presenting a radially approximate symmetrical distribution. Both N2 and CO2 dilutions decrease the intensity of the maximum OH radical fluorescence and the total OH radical fluorescence. Moreover, the flame temperature decreases more significantly with the CO2 dilution ratio due to the combination of the dilution effect and thermal effect.

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Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals

Abstract: The structure and characteristics of a turbulent inverse and normal oxy-fuel diffusion flame are In addition, differences in the mixing field and especially in the location of turbulent/non- * Corresponding author

Cited by 16 publications

References 28 publications

Numerical Investigation of Local Heat-Release Rates and Thermo-Chemical States in Side-Wall Quenching of Laminar Methane and Dimethyl Ether Flames

Numerical Investigation of Local Heat-Release Rates and Thermo-Chemical States in Side-Wall Quenching of Laminar Methane and Dimethyl Ether Flames

Soot particle size distribution reconstruction in a turbulent sooting flame with the split-based extended quadrature method of moments

OH-Planar Laser-Induced Fluorescence Measurements in Laminar Diffusion Flames of n-Heptane with Coflow Air Diluted by N₂ and CO₂

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Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals

Abstract: The structure and characteristics of a turbulent inverse and normal oxy-fuel diffusion flame are In addition, differences in the mixing field and especially in the location of turbulent/non- * Corresponding author

Cited by 16 publications

References 28 publications

Numerical Investigation of Local Heat-Release Rates and Thermo-Chemical States in Side-Wall Quenching of Laminar Methane and Dimethyl Ether Flames

Numerical Investigation of Local Heat-Release Rates and Thermo-Chemical States in Side-Wall Quenching of Laminar Methane and Dimethyl Ether Flames

Soot particle size distribution reconstruction in a turbulent sooting flame with the split-based extended quadrature method of moments

OH-Planar Laser-Induced Fluorescence Measurements in Laminar Diffusion Flames of n-Heptane with Coflow Air Diluted by N2 and CO2

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OH-Planar Laser-Induced Fluorescence Measurements in Laminar Diffusion Flames of n-Heptane with Coflow Air Diluted by N₂ and CO₂