Experimental studies of the fundamental flame speeds of syngas (H2/CO)/air mixtures

Bouvet, Nicolas; Chauveau, Christian; Gökalp, İskender; Halter, Fabien

doi:10.1016/j.proci.2010.05.088

Cited by 138 publications

(57 citation statements)

References 25 publications

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“…Figure 2 shows the measured laminar burning velocity of H 2 /CO/air mixtures compared with those of previous studies [42,[47][48][49][50][51][52]; all the data were measured with a spherically propagating flame at P u = 0.1 MPa and all data are in good agreement. This proves the correctness of the data obtained in this investigation.…”

Section: System Validation and Laminar Burning Velocitymentioning

confidence: 62%

Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

Sun

et al. 2014

Energies

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An experimental study of the intrinsic instabilities of H 2 /CO lean (φ = 0.4 to φ = 1.0) premixed flames at different hydrogen fractions ranging from 0% to 100% at elevated pressure and room temperature was performed in a constant volume vessel using a Schlieren system. The unstretched laminar burning velocities were compared with data from the previous literature and simulated results. The results indicate that excellent agreements are obtained. The cellular instabilities of syngas-air flames were discussed and critical flame radii were measured. When hydrogen fractions are above 50%, the flame tends to be more stable as the equivalence ratio increases; however, the instability increases for flames of lower hydrogen fractions. For the premixed syngas flame with hydrogen fractions greater than 50%, the decline in cellular instabilities induced by the increase in equivalence ratio can be attributed to a reduction of diffusive-thermal instabilities rather than increased hydrodynamic instabilities. For premixed syngas flames with hydrogen fractions lower than 50%, as the equivalence ratio increases, the cellular instabilities become more evident because the enhanced hydrodynamic instabilities become the dominant effect. For premixed syngas flames, the enhancement of cellular instabilities induced by the increase in hydrogen fraction is the result of both increasing diffusive-thermal and hydrodynamic instabilities.

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Section: System Validation and Laminar Burning Velocitymentioning

confidence: 62%

Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

Sun

et al. 2014

Energies

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“…A resume of literature reveals that various optical measurements methods have been proposed and used in the past in laminar flame speed measurements [9,[31][32][33]. These mainly include flame emission imaging techniques i.e.…”

Section: Experimental Facilitymentioning

confidence: 99%

Laminar flame speed of lignocellulosic biomass-derived oxygenates and blends of gasoline/oxygenates

Rossow

Modica

et al. 2017

Fuel

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“…Figure 3 presents measured and predicted laminar flame speeds versus equivalence ratio and pressure, respectively. Figure 3a from Bouvet et al (2011) shows the effect of syngas composition on the burning velocity. As expected, with the increase in H 2 fraction, the flame speed increases, flammability limits become wider, and the peak in flame speed occurs progressively at higher equivalence ratios, ϕ.…”

Section: Syngas Combustion and Emission Characteristicsmentioning

confidence: 99%

Using Petroleum and Biomass-Derived Fuels in Duel-fuel Diesel Engines

Xiao

2014

Novel Combustion Concepts for Sustainable Energy Development

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There is worldwide interest in developing renewable energy sources in a sustainable manner. Syngas and biogas offer significant potential in this context, as these fuels offer great flexibility with regard to their production and utilization. This chapter provides an overview of research dealing with the combustion and emission characteristics of these fuels, both as stand-alone fuels or by blending with petroleum fuels. Conversion methods for producing these fuels from different biomass sources are also briefly reviewed. While the syngas composition can vary widely, it generally has lower heating value, lower density, higher mass diffusivity, higher flame speeds, and wider flammability limits compared to hydrocarbon fuels. Moreover, its combustion leads to almost zero soot emission, although NO x emission may be a concern depending upon its composition and operating temperatures. Similarly, biogas has lower heating value compared to hydrocarbon fuels, and its ignition and combustion characteristics can vary noticeably depending upon its composition. While there have been few studies focusing directly on biogas combustion, there is extensive literature on methane combustion, including ignition, extinction, flammability limits, flame speeds, cellular instabilities, and emissions. Fundamental combustion aspects requiring further research include cellular instabilities, flame stabilization and blowout behavior, turbulent flames, and emission characteristics. Such efforts would lead to the development of optimized systems for producing these fuels and provide guidelines for optimizing their composition for a given set of operating conditions. The use of syngas and biogas in dual-fuel diesel engines has been a subject of numerous experimental and computational studies. A general observation is that the engine performance and emission characteristics are significantly modified by the presence of gaseous fuel. While the heat release in a diesel engine generally occurs through a hybrid combustion mode, involving rich premixed combustion and diffusion combustion, that in a dual-fuel engine also involves a lean combustion mode with a propagating flame. The dualfuel operation at high-load conditions can provide significant reduction in soot and CO soot emissions, while maintaining the engine efficiency, provided the injection characteristics including the amount of pilot fuel can be optimized. However, the NO x emission may increase, requiring a suitable strategy for lowering the temperatures. The dual-fuel strategy may be less effective at low load, resulting in lower thermal efficiency and higher UHC and CO emissions. Future work should be directed at optimizing the various parameters, such as injection timing, amount of pilot fuel injected, EGR, and multiple injections.

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Experimental studies of the fundamental flame speeds of syngas (H2/CO)/air mixtures

Cited by 138 publications

References 25 publications

Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

Laminar flame speed of lignocellulosic biomass-derived oxygenates and blends of gasoline/oxygenates

Using Petroleum and Biomass-Derived Fuels in Duel-fuel Diesel Engines

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