Effect of methane-dimethyl ether fuel blends on flame stability, laminar flame speed, and Markstein length

This study investigates the increase in methane and biogas flame reactivity enabled by the addition of syngas produced through fuel reforming. To isolate thermodynamic and chemical effects on the reactivity of the mixture, the burner simulations are performed with a constant adiabatic flame temperature of 1800 K. Compositions and temperatures are calculated with the chemical equilibrium solver of CANTERA® and the reactivity of the mixture is quantified using the adiabatic, freely-propagating premixed flame, and perfectly-stirred reactors of the CHEMKIN-Pro® software package. The results show that the produced syngas has a content of up to 30 % H2 with a temperature up to 950 K. When added to the fuel, it increases the laminar flame speed while maintaining a burning temperature of 1800 K. Even when cooled to 300 K, the laminar flame speed increases up to 30 % from the baseline of pure biogas. Hence, a system can be developed that controls and improves biogas flame stability under low reactivity conditions by varying the fraction of added syngas to the mixture. This motivates future experimental work on reforming technologies coupled with gas turbine exhausts to validate this numerical work.

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Laminar flame speed measurements of dimethyl ether in air at pressures up to 10atm

Fuel ◽

10.1016/j.fuel.2010.07.040 ◽

2011 ◽

Vol 90 (1) ◽

pp. 331-338 ◽

Cited By ~ 60

Author(s):

Jaap de Vries ◽

William B. Lowry ◽

Zeynep Serinyel ◽

Henry J. Curran ◽

Eric L. Petersen

Keyword(s):

Dimethyl Ether ◽

Laminar Flame ◽

Flame Speed ◽

Laminar Flame Speed

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Ignition delay time and laminar flame speed measurements of ammonia blended with dimethyl ether: A promising low carbon fuel blend

Renewable Energy ◽

10.1016/j.renene.2021.09.117 ◽

2021 ◽

Author(s):

Gani Issayev ◽

Binod Raj Giri ◽

Ayman M. Elbaz ◽

Krishna P. Shrestha ◽

Fabian Mauss ◽

...

Keyword(s):

Dimethyl Ether ◽

Ignition Delay ◽

Delay Time ◽

Ignition Delay Time ◽

Laminar Flame ◽

Flame Speed ◽

Laminar Flame Speed ◽

Low Carbon ◽

Fuel Blend

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A model for the laminar flame speed of binary fuel blends and its application to methane/hydrogen mixtures

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2012.04.015 ◽

2012 ◽

Vol 37 (13) ◽

pp. 10390-10396 ◽

Cited By ~ 39

Author(s):

Zheng Chen ◽

Peng Dai ◽

Shiyi Chen

Keyword(s):

Laminar Flame ◽

Flame Speed ◽

Laminar Flame Speed ◽

Fuel Blends ◽

Hydrogen Mixtures

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Laminar flame speed, Markstein length, and cellular instability for spherically propagating methane/ethylene–air premixed flames

Combustion and Flame ◽

10.1016/j.combustflame.2020.01.011 ◽

2020 ◽

Vol 214 ◽

pp. 464-474 ◽

Cited By ~ 1

Author(s):

Hee J. Kim ◽

Kyuho Van ◽

Dae K. Lee ◽

Chun S. Yoo ◽

Jeong Park ◽

...

Keyword(s):

Laminar Flame ◽

Premixed Flames ◽

Flame Speed ◽

Laminar Flame Speed ◽

Markstein Length

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Experimental Study on Laminar Flame Speeds and Markstein Length of Methane-Air Mixtures at Atmospheric Conditions

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.699.714 ◽

2014 ◽

Vol 699 ◽

pp. 714-719

Author(s):

Alaeldeen Altag Yousif ◽

Shaharin Anwar Sulaiman

Keyword(s):

High Speed ◽

Equivalence Ratio ◽

Laminar Flame ◽

Burning Velocity ◽

Ambient Pressure ◽

Flame Speed ◽

Laminar Flame Speed ◽

Atmospheric Conditions ◽

Laminar Burning Velocity ◽

Markstein Length

Accurate value of laminar flame speed is an important parameter of combustible mixtures. In this respect, experimental data are very useful for modeling improvement and validating chemical kinetic mechanisms. To achieve this, an experimental characterization on spherically expanding flames propagation of methane-air mixtures were carried out. Tests were conducted in constant volume cylindrical combustion chamber to measure stretched, unstretched laminar flame speed, laminar burning velocity, and flame stretch effect as quantified by the associated Markstein lengths. The mixtures of methane-air were ignited at extensive ranges of lean-to-rich equivalence ratios, under ambient pressure and temperature. This is achieved by high speed schlieren cine-photography for flames observation in the vessel. The results showed that the unstretched laminar burning velocity increased and the peak value of the unstretched laminar burning velocity shifted to the richer mixture side with the increase of equivalence ratio. The flame propagation speed showed different trends at different equivalence ratio for tested mixtures. It was found that the Markstein length was increased with the increase of equivalence ratio.

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