Laminar flame speed and Markstein length of syngas at normal and elevated pressures and temperatures

Ai, Yuhua; Zhou, Zhen; Chen, Zheng; Kong, Wenjun

doi:10.1016/j.fuel.2014.08.004

Cited by 44 publications

(17 citation statements)

References 36 publications

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“…The uncertainty in the determination of radius and that in the linear extrapolation of the stretched propagation velocity to zeros stretch make up the main uncertainty of the unstretched laminar flame speed. As discussed in our previous work [27], the overall uncertainty of unstretched laminar flame speed was within 5%.…”

Section: Experimental and Numerical Methodssupporting

confidence: 70%

“…3 shows the measured laminar flame speeds at elevated pressures (0.5 MPa and 1.0 MPa, 298 K) for H 2 /CO = 1:3 and O 2 /He = 1:6 and CO 2 dilution ratio variation from 0% to 30%. The 1:6 M ratio of O 2 /He mixture was selected to eliminate diffusional-thermal and hydrodynamic instability while maintain nearly the same flame temperature [27]. It is observed that the predicted results by three mechanisms are very close and this trend is true especially for high CO 2 dilution ratio.…”

Section: Effect Of Co 2 Dilution On Laminar Flame Speedsmentioning

confidence: 93%

“…Experiments were conducted in a dual-chambered, pressurerelease type cylindrical chamber [27], which was designed to withstand pressure up to 4 MPa. The inner diameters of two concentric cylindrical vessels are 100 mm and 300 mm, respectively.…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

“…In this study, the CO 2 dilution is the mole fraction of CO 2 in fuels (H 2 , CO and CO 2 ). The details of experimental facility and procedure can be found in our previous work [27]. All the experimental results are the average of at least three repeated experiments and up-down error bars are plotted to indicate the standard deviation.…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Laminar flame speeds of H 2 /CO with CO 2 dilution at normal and elevated pressures and temperatures

Han

Chen

et al. 2015

Fuel

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Section: Experimental and Numerical Methodssupporting

confidence: 70%

Section: Effect Of Co 2 Dilution On Laminar Flame Speedsmentioning

confidence: 93%

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Laminar flame speeds of H 2 /CO with CO 2 dilution at normal and elevated pressures and temperatures

Han

Chen

et al. 2015

Fuel

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“…Some studies on syngas fuel have been conducted to investigate the combustion characteristics [11,21,[23][24][25][26][27]. Besides, the instantaneous flame front structure of the turbulent premixed flames of syngas/ air mixtures has been measured by the authors [4,28] to investigate the turbulence-flame interaction.…”

Section: Introductionmentioning

confidence: 99%

Effects of stretch and preferential diffusion on tip opening of laminar premixed Bunsen flames of syngas/air mixtures

Wang

Wei

Shu

et al. 2015

Fuel

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Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

et al. 2019

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Summary In this study, combustion characteristics of various biogas/air mixtures with hydrogen addition at elevated temperatures were experimentally investigated using bunsen burner method. Methane, CH4, was diluted with different concentrations of carbon dioxide, CO2, 30 to 40% by volume, to prepare the biogas for testing. It is followed by the hydrogen, H2, enrichment within the range of 0 to 40% by volume and the temperature elevation of unburned gas till 440 K. Blowoff velocities were measured by lowering the jet velocity until a premixed flame could be stabilized at the nozzle exit, while laminar burning velocities were calculated by analyzing the shape of the directly captured premixed bunsen flames. The results showed that hydrogen had a positive effect on the blowoff velocity for all three fuel samples. Nonlinear growth of the blowoff velocity with hydrogen addition was associated to the dominance of methane‐inhibited hydrogen combustion process. It was also observed that the increase in the initial temperature of the unburned mixture led to a linear increase of the blowoff velocity. Moreover, specific changes in flame structure such as flame height, standoff distance, and the existence of tip opening were attributed to the change in the blowoff velocity. The effect of CO2 content in the mixture was examined with regards to laminar burning velocity for all compositions. The outcome of the experiment showed that the biogas mixture with higher content of CO2 possessed lower values of laminar burning velocity over the wide range of equivalence ratios. A reduced GRI‐Mech 3.0 was used to simulate the combustion of biogas/air mixtures with different compositions using ANSYS Fluent. The numerically simulated stable conical flames were compared with the experimental flames, in terms of flame structure, showing that the reduced GRI‐Mech 3.0 was suitable for modeling the combustion of biogas/air mixtures.

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Laminar flame speed and Markstein length of syngas at normal and elevated pressures and temperatures

Cited by 44 publications

References 36 publications

Laminar flame speeds of H 2 /CO with CO 2 dilution at normal and elevated pressures and temperatures

Laminar flame speeds of H 2 /CO with CO 2 dilution at normal and elevated pressures and temperatures

Effects of stretch and preferential diffusion on tip opening of laminar premixed Bunsen flames of syngas/air mixtures

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

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