Predictive analysis of combined burner parameter effects on oxy-fuel flames

Boushaki, Toufik; Guessasma, Sofiane; Sautet, Jean-Charles

doi:10.1016/j.applthermaleng.2010.08.034

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…In general, previous investigations were concerned mainly with the differences of soot formation characteristics, �ame temperature, and �ame appearance between NDFs and IDFs. ere have been very few investigations on �ame chemiluminescence characteristic, which is a common approach for characterizing the �ame reaction zones, �ame structures, and process parameters, such as fuel type, equivalence ratio, and strain rate [9][10][11]. e interest of this paper is mainly focused on the chemiluminescence distribution characteristics of excited radicals (OH * and CH * ) along the axis of NDFs and IDFs with different equivalence O/C ratios.…”

Section: Introductionmentioning

confidence: 99%

The Chemiluminescence and Structure Properties of Normal/Inverse Diffusion Flames

Zhang

Guo

Song

et al. 2013

Journal of Spectroscopy

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The flame emission spectrometry was applied to detect the distribution of excited radicals in two types CH4/O2 coflow jet diffusion flames (normal and inverse diffusion flames). Combining the image analysis along with the spectrometry, the chemiluminescence and structure characteristics of these diffusion flames were investigated. The results show that the inverse diffusion flame (IDF) with relatively high inlet oxygen velocity is composed of two regions: a bright base and a tower on top of the base, which is quite different from the normal diffusion flame (NDF). The flame is divided into two regions along the flame axis based on maximum OH* position (Region I: initial reaction zone; Region II: further oxidation zone). The degree of the further oxidization taking place in Region II is obvious in accordance with OH* distribution, which is the main difference in reaction zone between fuel-rich condition and fuel-lean condition for NDFs. For IDFs, the change of OH* distribution with increasing equivalence O/C ratio ([O/C]e) in Region II is not conspicuous. More OH* and CH* are generated in IDFs, due to the inner high-speed O2 flow promoting the mixing of fuel and oxygen to a certain extent.

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Section: Introductionmentioning

confidence: 99%

The Chemiluminescence and Structure Properties of Normal/Inverse Diffusion Flames

Zhang

Guo

Song

et al. 2013

Journal of Spectroscopy

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“…Boushaki et al (2011) studied the Oxy-fuel jets in parallel configuration experimentally. They confirmed that the flame stability is a strong function of the jet centerline velocity and jet spacing [28]. Subsequently, Hidouri et al (2016) performed a finite volume computations on three inline jets with ventilation using second-order Reynolds stress model.…”

Section: Introductionmentioning

confidence: 91%

Aerodynamic Studies on Non-Premixed Oxy-Methane Flames and Separated Oxy-Methane Cold Jets

et al. 2020

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Both cold and flame jets find numerous applications in different fields, ranging from domestic applications to aerospace and space technology. Indeed, the applications of isothermal and non-isothermal jets in the flame heating industry fascinated the researchers to gain an in-depth understanding. Nevertheless, these benefits are not standalone, rather, they are associated with major disadvantages such as improper jet mixing and flame instabilities that require careful remedies. In the present investigation, three-inline jets, having methane jet at the center and two oxygen jets at the periphery, are studied computationally in a three-dimensional domain, with and without considering the effects of combustion. To study the mixing characteristics of cold jets, the radial velocity distributions at different streamwise locations have been analyzed at the jet inlet velocity of 27 m/s. However, for oxygen and methane flame jets, inlet velocities are varied as 27 m/s and 54 m/s. Moreover, to investigate the effects of temperature variation on mixing characteristics at a particular jet velocity, the inlet temperatures of reactants are varied as 300 K, 500 K, and 700 K, at the jet inlet velocity of 27 m/s. Combustion is found to have a profound impact on the mixing characteristics. At the inlet temperature of 300 K, a higher centerline velocity decay is observed for non-reactive jets as compared to reactive flame jets. Moreover, the turbulent kinetic energy distribution is relatively higher in the case of non-reactive jets, which is the direct evidence of an augmented mixing. As is obvious, the turbulent kinetic energy at the jet shear layer is maximum due to the formation of large-scale coherent eddies. The decay in centerline velocity is found to be increasing with an increase of inlet temperature. Additionally, with an increase of jet velocity, the radial velocity profiles become more asymmetrical, consequently yielding an unstable flame.

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“…An impinging flow field, formed from the mutual impingement of multi-jets, has attracted interest in the investigation of the mixing characteristics of fuel and oxidizer in many fuel-injection systems [18][19][20][21][22][23][24][25][26][27]. Jet-impinging configurations have been extensively used and investigated in gas turbines, internal-combustion engines, and jet-propulsion systems because of their simple geometry and thorough mixing of fuel and oxidizer [20,[24][25][26][27][28][29][30][31]. In a non-reactive flow, the total pressure and the mixing section of the impinging flow in the vertical direction increase with the increasing angle of inclination of the jets [19,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…The blow-off limit of the impinging flame hence had a range greater than for a single jet flame [24]. Furthermore, the flame lift-off position, flame stability, and NO x emission were controlled with a triple-jet impinging burner through the modulation of the angle of inclination and the distance separating the oxygen jets [25,26]. In our previous work, an impinging flame was generated with a V-shaped burner [27]; the impingement of the two flames enhanced the mixing and the pre-heating of fuel because the interaction between flame and flow improved within the impinging area.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Fuel Mixing and Reaction in a CH4/Syngas/Air Premixed Impinging Flame with Varied H2/CO Proportion

et al. 2017

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For industrial applications, we propose a concept of clean and efficient combustion through burning syngas on an impinging burner. We performed experimental measurements of particle image velocimetry, OH radical (OH*) chemiluminescence, flame temperature, and CO emission to examine the fuel mixing and reaction of premixed impinging flames of CH 4 /syngas/air with H 2 /CO in varied proportions. The velocity distribution of the combustion flow field showed that a deceleration area in the main flow formed through the mutual impingement of two jet flows, which enhanced the mixing of fuel and air because of an increased momentum transfer. The deceleration area expanded with an increased CO proportion, which indicated that the mixing of fuel and air also increased with the increased CO proportion. Our examination of the OH* chemiluminescence demonstrated that its intensity increased with increased CO proportion, which showed that the reaction between fuel and air accordingly increased. CO provided in the syngas hence participated readily in the reaction of the CH 4 /syngas/air premixed impinging flames when the syngas contained CO in a large proportion. Although the volume flow rate of the provided CO quadrupled, the CO emission increased by only 12% to 15%. The results of this work are useful to improve the feasibility of fuel-injection systems using syngas as an alternative fuel.

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Predictive analysis of combined burner parameter effects on oxy-fuel flames

Cited by 13 publications

References 23 publications

The Chemiluminescence and Structure Properties of Normal/Inverse Diffusion Flames

The Chemiluminescence and Structure Properties of Normal/Inverse Diffusion Flames

Aerodynamic Studies on Non-Premixed Oxy-Methane Flames and Separated Oxy-Methane Cold Jets

An Investigation of Fuel Mixing and Reaction in a CH4/Syngas/Air Premixed Impinging Flame with Varied H2/CO Proportion

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