Kinetic study of the effects of hydrogen blending to toluene reference fuel (TRF)/air mixtures on laminar burning velocity and flame structure

Fuel ◽  
2020 ◽  
Vol 274 ◽  
pp. 117850 ◽  
Author(s):  
Fushui Liu ◽  
Zechang Liu ◽  
Zheng Sang ◽  
Xu He ◽  
Fengshan Liu ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Burning Velocity ◽  
Flame Structure ◽  
Laminar Burning Velocity

scholarly journals Burning Rates and Surface Characteristics of Hydrogen-Enriched Turbulent Lean Premixed Methane-Air Flames

2009 ◽  
Author(s):  
Hongsheng Guo ◽  
Badri Tayebi ◽  
Cedric Galizzi ◽  
Dany Escudie´
Keyword(s):  
Surface Area ◽  
Burning Velocity ◽  
Flame Structure ◽  
Surface Characteristics ◽  
Flame Surface ◽  
Laminar Burning Velocity ◽  
Hydrogen Addition ◽  
Lean Premixed ◽  
Burning Rates ◽  
Turbulent Burning Velocity

The burning rates and surface characteristics of hydrogen-enriched turbulent lean premixed methane-air flames were experimentally studied by laser tomography visualization method using a V-shaped flame configuration. Turbulent burning velocities were measured and the variation of flame surface characteristics due to hydrogen addition was analyzed. The results show that hydrogen addition causes an increase in turbulent burning velocity for lean CH4-air mixtures when the turbulent level in the unburned mixture is not changed. The increase rate of turbulent burning velocity is higher than that of the corresponding laminar burning velocity, suggesting that the increase in turbulent velocity due to hydrogen addition is caused by not only chemical kinetics effect, but also the variation in flame structure due to turbulence. The further analysis of flame surface characteristics and brush thickness indicate that hydrogen addition slightly decreases local flame surface density, but increases total flame surface area because of the increased flame brush thickness. As a result, turbulent burning velocity is intensified by the increase in total flame surface area and the increased laminar burning velocity, when hydrogen is added.

Further development of the three-region model of a premixed turbulent flame II. Instability dominated region 1

1979 ◽  
Vol 368 (1733) ◽  
pp. 283-293 ◽  
Keyword(s):  
Energy Balance ◽  
Viscous Dissipation ◽  
Balance Equation ◽  
Large Scale ◽  
Burning Velocity ◽  
Turbulent Flame ◽  
Flame Structure ◽  
Small Scale ◽  
Laminar Burning Velocity ◽  
Premixed Turbulent Flame

An analysis of the balance equation for turbulent kinetic energy of an instability dominated region 1 is presented for a turbulent, premixed propane-air flame. The effects of intensity, scale and laminar burning velocity on the energy balance are also examined. Specifically, the nature of instability in a turbulent flame and its influence on the flame structure are highlighted. These results show that either increase in scale or reduction in intensity of approach turbulence increases the magnitude of all the terms in the balance equation. The core region of the flame is unaffected by a small scale instability, whereas, for a large scale instability, the ratio of turbulence production/viscous dissipation remains independent of scale. The dominant terms in the energy balance are found to be those of convection and advection when the structure of the flame turbulence consists mainly of a large scale fluctuating motion. Finally, increase in laminar burning velocity restores stability and causes transition to region 2, in which production and viscous dissipation predominate over convection and advection terms, respectively.

Experimental and Computational Determination of Laminar Burning Velocity of Liquefied Petroleum Gas-Air Mixtures at Elevated Temperatures

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Mohammad Akram ◽  
Sudarshan Kumar ◽  
Priyank Saxena
Keyword(s):  
Elevated Temperatures ◽  
Burning Velocity ◽  
Flame Structure ◽  
Laminar Burning Velocity ◽  
Liquefied Petroleum Gas ◽  
Diverging Channel ◽  
Rich Mixtures ◽  
Computational Predictions ◽  
Good Agreement

The laminar burning velocity of liquefied petroleum gas (LPG) air mixtures at high temperatures is extracted from the planar flames stabilized in the preheated mesoscale diverging channel. The experiments were carried out for a range of equivalence ratios and mixture temperatures. Computational predictions of the burning velocity and detailed flame structure were performed using the PREMIX code with USC mech 2.0. The present data are in very good agreement with both the recent experimental and computational results available. A peak burning velocity was observed for slightly rich mixtures, even at higher mixture temperatures. The minimum value of th temperature exponent is observed for slightly rich mixtures.

Laminar Burning Velocity of LPG-Air Mixture at Elevated Temperatures

2012 ◽  
Author(s):  
Mohammad Akram ◽  
Priyank Saxena ◽  
Sudarshan Kumar
Keyword(s):  
Elevated Temperatures ◽  
Burning Velocity ◽  
Flame Structure ◽  
Laminar Burning Velocity ◽  
Liquefied Petroleum Gas ◽  
Diverging Channel ◽  
Rich Mixtures ◽  
Meso Scale ◽  
Computational Predictions ◽  
Good Agreement

Laminar burning velocity of liquefied petroleum gas (LPG) air mixtures at high temperatures is extracted from the planar flames stabilized in the preheated meso-scale diverging channel. The experiments were carried out for a range of equivalence Computational predictions of burning velocity and detailed flame structure were performed using PREMIX code with USC mech 2.0. The present data are in very good agreement with both experimental and computational results available. Peak burning velocity was observed for slightly rich mixtures even at higher mixture temperatures. The minimum value of temperature exponent is observed for slightly rich mixtures.

Effects of CO content on laminar burning velocity of typical syngas by heat flux method and kinetic modeling

2014 ◽  
Vol 39 (17) ◽  
pp. 9534-9544 ◽  
Author(s):  
Yong He ◽  
Zhihua Wang ◽  
Wubin Weng ◽  
Yanqun Zhu ◽  
Junhu Zhou ◽  
...  
Keyword(s):  
Heat Flux ◽  
Kinetic Modeling ◽  
Burning Velocity ◽  
Laminar Burning Velocity ◽  
Flux Method

scholarly journals Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 996
Author(s):  
Venera Giurcan ◽  
Codina Movileanu ◽  
Adina Magdalena Musuc ◽  
Maria Mitu
Keyword(s):  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Burning Velocity ◽  
Internal Combustion ◽  
Electricity Production ◽  
Engine Fuel ◽  
Laminar Burning Velocity ◽  
Waste Products

Currently, the use of fossil fuels is very high and existing nature reserves are rapidly depleted. Therefore, researchers are turning their attention to find renewable fuels that have a low impact on the environment, to replace these fossil fuels. Biogas is a low-cost alternative, sustainable, renewable fuel existing worldwide. It can be produced by decomposition of vegetation or waste products of human and animal biological activity. This process is performed by microorganisms (such as methanogens and sulfate-reducing bacteria) by anaerobic digestion. Biogas can serve as a basis for heat and electricity production used for domestic heating and cooking. It can be also used to feed internal combustion engines, gas turbines, fuel cells, or cogeneration systems. In this paper, a comprehensive literature study regarding the laminar burning velocity of biogas-containing mixtures is presented. This study aims to characterize the use of biogas as IC (internal combustion) engine fuel, and to develop efficient safety recommendations and to predict and reduce the risk of fires and accidental explosions caused by biogas.

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