A comparison of the thermal and emission characteristics of co and counter swirl inverse diffusion flames

Kotb, Ashraf; Saad, Hany

doi:10.1016/j.ijthermalsci.2016.06.015

Cited by 23 publications

(7 citation statements)

References 19 publications

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“…It is observed that the internal recirculation zone in the flame which stabilizes and shortens the flame. Kotb and Saad [11] experimented with the swirl burners to examine the thermal and pollutants of an IDF. An effect of swirl vane angle and a number of swirl vanes on thermal and emission characteristics of an IDF have been investigated by Patel and Shah [12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer characteristics of an inverse diffusion flame in a coaxial tube burner for with and without swirl

Badiger¹,

Katti²,

Anil³

2022

Journal of Thermal Engineering

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Heat transfer by flame jet impingement is widely used in many of the industrial and domestic applications like heating metal bars, scrap melting, shaping the glass, metal slab cutting, domestic cooking and others. Aim of the present experimental work is to study an effect of swirl on a local heat flux distribution of an inverse diffusion flame (IDF) jet impinging on a flat target surface in a coaxial tube burner. The twisted tape of twist ratio 3 (corresponding to the swirl number, S = 0.52) is used to create a swirl in the central air jet of the burner. The flame shapes and heat flux distributions are compared for the with and without swirling IDF under the different air jet Reynolds number (Re a ) of 1000 to 2500, equivalence ratio (ϕ) of 0.4 to 1.3 and a burner-to-impingement plate distance (H) of 10 to 100mm. The distributions of heat fluxes are studied within a radius of 75 mm from the point of stagnation on an impingement plate. Results show that the swirling IDF helps in clean combustion of the fuel with much shorter flame height. Swirling in the flame jet enhances the peak heat flux for the higher air jet Reynolds number for slightly fuel rich conditions of ϕ = 1.1 at the optimal burner-to-target plate distance of 40 mm.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer characteristics of an inverse diffusion flame in a coaxial tube burner for with and without swirl

Badiger¹,

Katti²,

Anil³

2022

Journal of Thermal Engineering

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“…Thermal and heat transfer characteristics of both swirling and non-swirling IDFs have been carried out by Zhen et al [22], and the wall static pressure and heat flux in the radial locations of the target plate found to be the M-shaped profile. Kotb and Saad [23] conducted experiments to compare the thermal and pollutant emissions of co-and counter swirl inversion diffusion flames. The co-swirl IDF showed a higher-temperature, CO 2 and NO x emissions.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer characteristics of an inverse diffusion flame with induced swirl

Badiger¹,

Anil²,

Hindasageri³

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The flame shapes and heat transfer characteristics of methane swirling inverse diffusion flame jet are studied experimentally in an inverse diffusion flame burner. The twisted tape of 15 mm pitch (corresponding to the twist ratio of 2.5 and swirl number of 0.62) is used to create the swirl in the flame jet. The influence of twisted tape at an air jet Reynolds number varying from 1500 to 3000, equivalence ratio varying from 0.4 to 1.4 and burner surface to impingement plate distance of 10-100 mm, is studied. The heat transfer characteristics from an IDF burner are studied through an evaluation of the average heat flux distribution and its coefficient of variance for the four distinct areas on an impingement plate. Results show that the swirl augments the heat flux distribution by up to 480% for slightly richer than stoichiometric flames. Furthermore, the impact of swirling is observed to boost the uniformity of heat flux distribution.

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“… 8 , 9 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, 10 − 13 and thus it has been paid growing interests in the past few years. Additionally, the IDF existed in various engineering sceneries of power generation and fire safety.…”

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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A comparison of the thermal and emission characteristics of co and counter swirl inverse diffusion flames

Cited by 23 publications

References 19 publications

Experimental investigation of heat transfer characteristics of an inverse diffusion flame in a coaxial tube burner for with and without swirl

Experimental investigation of heat transfer characteristics of an inverse diffusion flame in a coaxial tube burner for with and without swirl

Heat transfer characteristics of an inverse diffusion flame with induced swirl

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

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