Analysis of CH* concentration and flame heat release rate in laminar coflow diffusion flames under microgravity and normal gravity

Giassi, Davide; Cao, Su; Bennett, Beth Anne V.; Stocker, Dennis P.; Takahashi, Fumiaki; Smooke, Mitchell D.; Long, Marshall B.

doi:10.1016/j.combustflame.2016.02.012

Cited by 53 publications

(19 citation statements)

References 22 publications

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“…Thus, the intensity was normalized by its maximum value on each image before post-processing. The 2D image of the front was retrieved from the 3D CH* chemiluminescence using Abel deconvolution [26].…”

Section: Observations At the Burner Lipmentioning

confidence: 99%

Stabilization mechanisms of an ammonia/methane non-premixed jet flame up to liftoff

Colson

Kühni

Hayakawa

et al. 2021

Combustion and Flame

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Ammonia is a promising alternative fuel for CO 2 emission mitigation. The use of ammonia blends allows for more flexibility compared to pure ammonia fuel and is often considered for immediate CO 2 emission reduction in existing facilities running on natural gas.However, fundamental studies on these fuel mixtures remain scarce. This study thus focuses on ammonia/methane blend fuels. The effect of ammonia on methane jet flame stabilization is investigated using a non-premixed jet flame configuration to observe the flame stabilization mechanisms, the flame-burner interactions and how ammonia addition affects the attached flame stabilization up to liftoff. The flame tip position was observed using CH* chemiluminescence. Heat transfer to the burner was monitored by temperature measurement at

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Section: Observations At the Burner Lipmentioning

confidence: 99%

Stabilization mechanisms of an ammonia/methane non-premixed jet flame up to liftoff

Colson

Kühni

Hayakawa

et al. 2021

Combustion and Flame

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“…The flame shape assessment has been performed comparing the mean OH * molar concentration with the experimental line-of-sight OH * chemiluminescence imaging reported in [14]. As stated in [24], OH * emission intensity is proportional to OH * concentration, so the intensity distribution of OH * chemiluminsecence can be described qualitatively by the OH * concentration distribution.…”

Section: Hydrogen Additionmentioning

confidence: 99%

Numerical study of the lean premixed PRECCINSTA burner with hydrogen enrichment

et al. 2021

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Hydrogen combustion is one of the most promising solution to achieve a global decarbonization in power production and transports. Pure hydrogen combustion is far from becoming a standard but, during the energy transition, hydrogen co-firing can be a feasible and economically attractive shortterm measure. The use of hydrogen blending gives rise to several issues related to flashback, NOx emissions and thermo-acoustic instabilities. To improve the understanding of the effect of hydrogen enrichment, herein a numerical analysis of lean premixed hydrogen enriched flames is performed by means of 3D unsteady CFD simulations. The numerical model has been assessed against experimental results for both cold and reacting flows in terms of velocity profile (average) and flame shape (mean OH* radical fields). The burner under investigation is the swirl stabilized PRECCINSTA studied at the Deutsches Zentrum für Luft-und Raumfahrt (DLR). The DLR’s researchers have shown the effect of hydrogen addition on the flame topology and combustion instabilities at various operating conditions in terms of thermal power, equivalence ratio and H2 volume fraction. Simulations are in good accordance with experimental data both in terms of velocity and temperature profiles. The numerical model provides a qualitative estimation of the flame shape.

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“…The function classifies the data in order to minimise the expected classification cost, according to eq. C.1: 18 shows an example of the classification between groups, where the CH * intensity is plotted versus OH * for all groups using a scatter plot. Circles corresponds to points that have been positively classified and crosses corresponds to misclassified points.…”

Section: C1 Classification Algorithmmentioning

confidence: 99%

“…The spontaneous emission from flames can be used, alone or combined with other methods to characterise a combustion mode. The chemiluminescence emitted by a hydrocarbon fuel flame, when acquired by optical devices such as spectrometers [4e8], or CCD cameras [9e16] provide valuable information regarding the combustion process, which has been experimentally related to heat release [17,18], equivalence ratio [19e21], temperature [22,23], pressure [24] and pollutant formation [25e27] in a variety of burners [28e30]. The captured information from flame images, after extracting relevant features, can be used to design predictive models aiming at combustion monitoring and control.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of hydrogen and primary air in a commercial partially-premixed atmospheric gas burner by means of optical and supervised machine learning techniques

González-Espinosa

Gil

Royo-Pascual³

et al. 2020

International Journal of Hydrogen Energy

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Analysis of CH* concentration and flame heat release rate in laminar coflow diffusion flames under microgravity and normal gravity

Cited by 53 publications

References 22 publications

Stabilization mechanisms of an ammonia/methane non-premixed jet flame up to liftoff

Stabilization mechanisms of an ammonia/methane non-premixed jet flame up to liftoff

Numerical study of the lean premixed PRECCINSTA burner with hydrogen enrichment

Effects of hydrogen and primary air in a commercial partially-premixed atmospheric gas burner by means of optical and supervised machine learning techniques

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