Properties of inverse nonpremixed pure O 2 /CH 4 coflow flames in a model combustor

Choi, Seok Keun; Kim, Tae Young; Kim, Hee Kyung; Koo, Jaye; Kim, Jeong Soo; Kwon, Oh Chae

doi:10.1016/j.energy.2015.09.110

Cited by 29 publications

(3 citation statements)

References 30 publications

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“…The ignition point depends on the burner structure and fuel type and is only available for a detached flame. For an attached flame where the fuel is ignited inside the burner outlet, the ignition point is not visible [29].…”

Section: ) Geometric Parametersmentioning

confidence: 99%

Quantitative Assessment of Burner Flame Stability Through Digital Image Processing

Yan

Bai

2022

IEEE Trans. Instrum. Meas.

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Section: ) Geometric Parametersmentioning

confidence: 99%

Quantitative Assessment of Burner Flame Stability Through Digital Image Processing

Yan

Bai

2022

IEEE Trans. Instrum. Meas.

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“…Apart from the NDF, the “inverse diffusion flame (IDF)” is another distinct kind of diffusion flame mode with an inner high-speed air jet being surrounded by annular, one or more, low-speed fuel jets in either confined or unconfined conditions. , It was extensively proved by experiments and simulations that the superior advantages of premixed and nonpremixed flames can be integrated in the IDF configuration. The IDFs showed no flashback, less soot loading versus the NDFs, low emissions, and an extended range of flame flammability, − and thus it has been paid growing interests in the past few years.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Dimethyl Ether Combustion Characteristics in Normal and Inverse Diffusion Spherical Flame Geometries

et al. 2020

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This paper makes a comparative study on the normal diffusion flame (NDF) and inverse diffusion flame (IDF) characteristics of dimethyl ether (DME) in microgravitational spherical diffusion flame geometry by simulations with detailed fuel chemistry and a transport model. It is found that there always existed two combustion modes (i.e., hot flame and cool flame) in either NDF or IDF condition. The combustion progress of hot flames was controlled by diffusive mixing, while that of cool flames was controlled by low-temperature competing kinetics. The cool-flame structure dynamics were far away from the chemical equilibrium. The low-temperature branching rate of DME was positively dependent on the oxygen level, while its termination rate was enhanced with the increasing temperature. Being rather distinct from the NDF counterpart, DME IDFs had the oxygen-enriched combustion feature in either hot- or cool-flame condition. Furthermore, DME hot-flame extinction was induced by thermal radiative loss, while the cool-flame extinction was induced especially by the decrease of the low-temperature branching rate. Compared with hot NDFs, it would be of less effectiveness to control the hot IDF combustion process by positive measures. However, combustion in the latter configuration was much more stable than the former. In either NDF or IDF geometry, the cool-flame chemistry could help to extend the fuel flammability range considerably, and the two-reaction-zone structure of cool flame was responsible for cool-flame stability. In addition, the IDFs had much better ignition performance than the NDF counterpart.

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“…Hence, there is a growing interest in the inverse non-premixed coflow flames [16], even if inverse CH 4 /air coflow flames present reduced stability limits with respect to normal non-premixed CH 4 /air coflow flames [16,17].…”

Section: Introductionmentioning

confidence: 99%

Flame Structure and Chemiluminescence Emissions of Inverse Diffusion Flames under Sinusoidally Driven Plasma Discharges

et al. 2017

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Reduction of nitric oxides (NO x ) in aircraft engines and in gas turbines by lean combustion is of great interest in the design of novel combustion systems. However, the stabilization of the flame under lean conditions is a main issue. In this context, the present work investigates the effects of sinusoidal dielectric barrier discharge (DBD) on a lean inverse diffusive methane/air flame in a Bunsen-type burner under different actuation conditions. The flame appearance was investigated with fixed methane loading (mass flux), but with varying inner airflow rate. High-speed flame imaging was done by using an intensified (charge-coupled device) CCD camera equipped with different optical filters in order to selectively record signals from the chemiluminescent species OH*, CH*, or CO 2 * to evaluate the flame behavior in presence of plasma actuation. The electrical power consumption was less than 33 W. It was evident that the plasma flame enhancement was significantly influenced by the plasma discharges, particularly at high inner airflow rates. The flame structure changes drastically when the dissipated plasma power increases. The flame area decreases due to the enhancement of mixing and chemical reactions that lead to a more anchored flame on the quartz exit with a reduction of the flame length.

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Properties of inverse nonpremixed pure O 2 /CH 4 coflow flames in a model combustor

Cited by 29 publications

References 30 publications

Quantitative Assessment of Burner Flame Stability Through Digital Image Processing

Quantitative Assessment of Burner Flame Stability Through Digital Image Processing

Comparative Study on the Dimethyl Ether Combustion Characteristics in Normal and Inverse Diffusion Spherical Flame Geometries

Flame Structure and Chemiluminescence Emissions of Inverse Diffusion Flames under Sinusoidally Driven Plasma Discharges

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