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Your search keyword '"Stable flames"' showing total 3 results
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3 results on '"Stable flames"'

1. Experimental and numerical studies of the diluent influence (N2, Ar, He, Xe) on stable premixed methane flames in micro-combustion.

Author

Chouraqui, Hugo, Dayma, Guillaume, Ribert, Guillaume, Halter, Fabien, Chauveau, Christian, and Dagaut, Philippe

Abstract

This work focuses on the diluent influence on stable methane flames in a fused silica micro flow reactor (MFR). Experimental and numerical investigations are performed. The first part presents the method of performing experiments and extracting data from an MFR in order to increase the reliability of the experimental results necessary for subsequent numerical simulations. Those methods are applied to premixed stoichiometric methane flames diluted by nitrogen, argon, helium and xenon. Methods to point out the influence of mixture thermodynamic and transport properties influence is presented. A numerical study of the influence of diluent on stable flames is also undertaken to support the experimental observations difficult to realize in such micro-devices. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Experimental and numerical studies of the diluent influence (N2, Ar, He, Xe) on stable premixed methane flames in micro-combustion

Author

Christian Chauveau, Hugo Chouraqui, Guillaume Dayma, Fabien Halter, Guillaume Ribert, Philippe Dagaut, Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Ministry of Research in Higher Education (MESRI), ANR-11-LABX-0006,CAPRYSSES,Cinétique chimique et Aérothermodynamique pour des Propulsions et des Systèmes Energétiques Propres(2011), and Combustion Institute

Subjects
Work (thermodynamics), Materials science, Diluents, 020209 energy, General Chemical Engineering, Combustion, chemistry.chemical_element, Thermodynamics, FREI, 02 engineering and technology, Micro-combustion, 01 natural sciences, Diluent, Methane, 010305 fluids & plasmas, chemistry.chemical_compound, Xenon, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Physical and Theoretical Chemistry, ComputingMilieux_MISCELLANEOUS, Helium, Argon, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Mechanical Engineering, chemistry, Stable flames
Abstract

International audience; This work focuses on the diluent influence on stable methane flames in a fused silica micro flow reactor (MFR). Experimental and numerical investigations are performed. The first part presents the method of performing experiments and extracting data from an MFR in order to increase the reliability of the experimental results necessary for subsequent numerical simulations. Those methods are applied to premixed stoichiometric methane flames diluted by nitrogen, argon, helium and xenon. Methods to point out the influence of mixture thermodynamic and transport properties influence is presented. A numerical study of the influence of diluent on stable flames is also undertaken to support the experimental observations difficult to realize in such micro-devices.

Published
2021

3. Computational Analysis of the Stability Limits of Premixed Methane-air Combustion in Micro-channels

Author

Kutkut, Almoutazbellah Adnan

Subjects
Microscale combustion, premixed combustion, lean and rich flames, stable flames, FREI, flame span, computational fluid dynamics (CFD), numerical simulations., Energy Systems, Heat Transfer, Combustion
Abstract

Technological progress in the last decades facilitated the development of integrated microsystem devices, including electrical and mechanical components for micro-electro-mechanical systems (MEMS). Such systems necessitate an external power supply, but typical batteries yet have some unavoidable limitations. To address this problem, numerous studies have been conducted to develop alternatives powered by micro combustion – in order to effectively utilize the high-density energy of hydrocarbon fuels. Such a global need has resulted in much more attention devoted to the combustion-based micro-power generation systems. However, to better understand the typical combustion characteristics in such microscale systems, design and performance restrictions need to be further examined. A notable research step in this direction is undertaken within the frame of the present thesis, where the behavior of a premixed methane-air flame in a quartz microreactor of diameter 2.3 mm, with a wall temperature externally controlled by a McKenna-style flat-flame burner fueled by a hydrogen-air mixture, is computationally studied. A premixed methane-air mixture is supplied to this microreactor at various inlet velocities in the range from 0.1 m/s to 0.6 m/s. In addition, various equivalence ratios in the range 0.6 ≤ �� ≤ 1.4 are considered and further investigated at two inlet velocities of 0.2 m/s and 0.4 m/s. Such a combination of equivalence ratios and inlet velocities provides insights into the impact of the equivalence ratio on both the stable and unstable flames. The present simulation results are validated by the prior experimental data as well as by other similar studies in the literature, with good agreement observed. The present work provides in-depth insights into a variety of phenomena such as ignition, flame propagation, flames with repetitive extinctions and ignitions (FREI) and flame stabilization. In particular, the ignition time and location, the flame span, and the FREI-related characteristics are scrutinized. The present work also provides a solid basis to predict the flame behavior under various conditions and aid in acquiring knowledge of the combustion dynamics for many practical combustors.

Published
2022

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