Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel

The flammable hydrogen-blended methane–air and natural gas–air mixtures raise specific safety and environmental issues in the industry and transportation; therefore, their explosion characteristics such as the explosion limits, explosion pressures, and rates of pressure rise have significant importa...

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Autores principales:	Maria Mitu, Domnina Razus, Volkmar Schroeder
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hydrogen methane natural gas laminar burning velocity (LBV) closed vessel combustion Technology T
Acceso en línea:	https://doaj.org/article/d119038ed9f4433da9a5ce35fc531820
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spelling	oai:doaj.org-article:d119038ed9f4433da9a5ce35fc5318202021-11-25T17:26:38ZLaminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel10.3390/en142275561996-1073https://doaj.org/article/d119038ed9f4433da9a5ce35fc5318202021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7556https://doaj.org/toc/1996-1073The flammable hydrogen-blended methane–air and natural gas–air mixtures raise specific safety and environmental issues in the industry and transportation; therefore, their explosion characteristics such as the explosion limits, explosion pressures, and rates of pressure rise have significant importance from a safety point of view. At the same time, the laminar burning velocities are the most useful parameters for practical applications and in basic studies for the validation of reaction mechanisms and modeling turbulent combustion. In the present study, an experimental and numerical study of the effect of hydrogen addition on the laminar burning velocity (LBV) of methane–air and natural gas–air mixtures was conducted, using mixtures with equivalence ratios within 0.90 and 1.30 and various hydrogen fractions <i>r<sub>H</sub></i> within 0.0 and 0.5. The experiments were performed in a 14 L spherical vessel with central ignition at ambient initial conditions. The LBVs were calculated from <i>p</i>(<i>t</i>) data, determined in accordance with EN 15967, by using only the early stage of flame propagation. The results show that hydrogen addition determines an increase in LBV for all examined binary flammable mixtures. The LBV variation versus the fraction of added hydrogen, <i>r<sub>H</sub></i>, follows a linear trend only at moderate hydrogen fractions. The further increase in <i>r<sub>H</sub></i> results in a stronger variation in LBV, as shown by both experimental and computed LBVs. Hydrogen addition significantly changes the thermal diffusivity of flammable CH<sub>4</sub>–air or NG–air mixtures, the rate of heat release, and the concentration of active radical species in the flame front and contribute, thus, to LBV variation.Maria MituDomnina RazusVolkmar SchroederMDPI AGarticlehydrogenmethanenatural gaslaminar burning velocity (LBV)closed vessel combustionTechnologyTENEnergies, Vol 14, Iss 7556, p 7556 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrogen methane natural gas laminar burning velocity (LBV) closed vessel combustion Technology T
spellingShingle	hydrogen methane natural gas laminar burning velocity (LBV) closed vessel combustion Technology T Maria Mitu Domnina Razus Volkmar Schroeder Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel
description	The flammable hydrogen-blended methane–air and natural gas–air mixtures raise specific safety and environmental issues in the industry and transportation; therefore, their explosion characteristics such as the explosion limits, explosion pressures, and rates of pressure rise have significant importance from a safety point of view. At the same time, the laminar burning velocities are the most useful parameters for practical applications and in basic studies for the validation of reaction mechanisms and modeling turbulent combustion. In the present study, an experimental and numerical study of the effect of hydrogen addition on the laminar burning velocity (LBV) of methane–air and natural gas–air mixtures was conducted, using mixtures with equivalence ratios within 0.90 and 1.30 and various hydrogen fractions <i>r<sub>H</sub></i> within 0.0 and 0.5. The experiments were performed in a 14 L spherical vessel with central ignition at ambient initial conditions. The LBVs were calculated from <i>p</i>(<i>t</i>) data, determined in accordance with EN 15967, by using only the early stage of flame propagation. The results show that hydrogen addition determines an increase in LBV for all examined binary flammable mixtures. The LBV variation versus the fraction of added hydrogen, <i>r<sub>H</sub></i>, follows a linear trend only at moderate hydrogen fractions. The further increase in <i>r<sub>H</sub></i> results in a stronger variation in LBV, as shown by both experimental and computed LBVs. Hydrogen addition significantly changes the thermal diffusivity of flammable CH<sub>4</sub>–air or NG–air mixtures, the rate of heat release, and the concentration of active radical species in the flame front and contribute, thus, to LBV variation.
format	article
author	Maria Mitu Domnina Razus Volkmar Schroeder
author_facet	Maria Mitu Domnina Razus Volkmar Schroeder
author_sort	Maria Mitu
title	Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel
title_short	Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel
title_full	Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel
title_fullStr	Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel
title_full_unstemmed	Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel
title_sort	laminar burning velocities of hydrogen-blended methane–air and natural gas–air mixtures, calculated from the early stage of <i>p</i>(<i>t</i>) records in a spherical vessel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d119038ed9f4433da9a5ce35fc531820
work_keys_str_mv	AT mariamitu laminarburningvelocitiesofhydrogenblendedmethaneairandnaturalgasairmixturescalculatedfromtheearlystageofipiitirecordsinasphericalvessel AT domninarazus laminarburningvelocitiesofhydrogenblendedmethaneairandnaturalgasairmixturescalculatedfromtheearlystageofipiitirecordsinasphericalvessel AT volkmarschroeder laminarburningvelocitiesofhydrogenblendedmethaneairandnaturalgasairmixturescalculatedfromtheearlystageofipiitirecordsinasphericalvessel
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Laminar Burning Velocities of Hydrogen-Blended Methane–Air and Natural Gas–Air Mixtures, Calculated from the Early Stage of <i>p</i>(<i>t</i>) Records in a Spherical Vessel

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