Experimental and Numerical Investigation on the Laminar Flame Speed of CH4/O2 Mixtures Diluted With CO2 and H2O

Mazas, Antoine; Lacoste, Déanna A.; Schuller, Thierry

doi:10.1115/gt2010-22512

Cited by 50 publications

(37 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laminar flame speeds and ignition delays are very fundamental combustion properties of interest to validate kinetic mechanisms and assess the operability of burners. However, few fundamental experimental studies on wet combustion are available in the literature [4] and there still exists a need for more and well-documented experiments, involving different fuels and a wider range of operating conditions. In the literature, previous studies on wet combustion are usually motivated by other contexts and do not provide a lot of fundamental experimental data at lean and ultra-wet conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This yields an increase in cycle efficiency at low N O x emissions [1]. Such large amount of steam significantly decreases burning velocity [10,4] and may make the stabilization of the flame difficult. Laminar flame speeds and ignition delays are very fundamental combustion properties of interest to validate kinetic mechanisms and assess the operability of burners.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of burning velocities of ultra-wet methane–air–steam mixtures

Albin

Nawroth

Göke

et al. 2013

Fuel Processing Technology

View full text Add to dashboard Cite

Global burning velocities of methane-air-steam mixtures are measured on prismatic laminar Bunsen flames and lifted turbulent V-flames for various preheating temperatures, equivalence ratios and steam mixture fractions at atmospheric pressure. Experiments are conducted on a new rectangular slot-burner. Experimental burning velocities are compared to computed flame speeds of one dimensional adiabatic premixed flames using detailed mechanisms (Konnov 0.5 and GRI Mech 3.0). Mean profiles of radicals OH * are also extracted from these flames and compared to simulation results.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of burning velocities of ultra-wet methane–air–steam mixtures

Albin

Nawroth

Göke

et al. 2013

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…Firstly, steam addition reduces the flame temperature and, hence, restrains the thermal NO x formation pathway. Secondly, the steam addition decreases the concentrations of the active radicals which, therefore, affects the reaction kinetics for NO x formation [5]. As for the steam influence on the CO emission, however, people's conclusions are divergent.…”

Section: Introductionmentioning

confidence: 91%

“…One impact is that the flame temperature and chemical reaction rate are decreased due to the heat capacity of added steam and the diluted mole fraction of important chain branching radicals (e.g., O, CH, OH, etc.) [5,6]. This impact results in a lower burning velocity [7][8][9][10], which brings a higher LBO risk for burning fuels with low reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure

Tong

Thern

et al. 2017

Energies

View full text Add to dashboard Cite

Steam-diluted combustion in gas turbine systems is an effective approach to control pollutant emissions and improve the gas turbine efficiency. The primary purpose of the present research is to analyze the influence of steam dilution on the combustion stability, flame structures, and CO emissions of a swirl-stabilized gas turbine model combustor under atmospheric pressure conditions. The premixed methane/air/steam flame was investigated with three preheating temperatures (384 K/434 K/484 K) and the equivalence ratio was varied from stoichiometric conditions to the flammability limits where the flame was physically blown out from the combustor. In order to represent the steam dilution intensity, the steam fraction Ω defined as the steam to air mass flow rate ratio was used in this work. Exhaust gases were sampled with a water-cooled emission probe which was mounted at the combustor exit. A 120 mm length quartz liner was used which enabled the flame visualization and optical measurement. Time-averaged CH chemiluminescence imaging was conducted to characterize the flame location and it was further analyzed with the inverse Abel transform method. Chemical kinetics calculation was conducted to support and analyze the experimental results. It was found that the LBO (lean blowout) limits were increased with steam fraction. CH chemiluminescence imaging showed that with a high steam fraction, the flame length was elongated, but the flame structure was not altered. CO emissions were mapped as a function of the steam fraction, inlet air temperature, and equivalence ratios. Stable combustion with low CO emission can be achieved with an appropriate steam fraction operation range.

show abstract

“…However, thermal loss through exhaust gases increases signi cantly due to the vapor content of these gases. In addition, water reduces the ame speed, which necessitates a change in ignition timing to optimal combustion phasing and maximum BTE [45,46]. Since the ignition timing was xed at each rpm in this work, the combustion phasing was not optimum for the case of water injection.…”

Section: Optimizationmentioning

confidence: 99%

Performance and emissions optimization of an ethanol-gasoline fueled SI engine with oxygen enrichment using artificial bee colony algorithm

2017

View full text Add to dashboard Cite

Abstract. The use of arti cial neural network in conjunction with arti cial bee colony algorithm is proposed as a method for performance and emissions optimization of an SI engine. The case study here involves the oxygen enriched combustion of an SI engine fueled with hydrous ethanol and gasoline. In this study, the engine was considered as a black box and its performance and emissions were extracted experimentally at di erent intake air oxygen concentrations, hydrous ethanol injection rates, and ethanol concentration in the hydrous ethanol mixture. Then, the simultaneous injection of hydrous ethanol and oxygen enriched combustion was investigated to maximize the fuel conversion e ciency and minimize the CO and NOx emissions. Therefore, an objective function consisting of both the emission and performance parameters was optimized using the Arti cial Bee Colony algorithm. The engine model used in this optimization process was obtained from an Arti cial Neural Network trained with experimental engine data. For operating speed of 3000 rpm, the optimization results indicated 1.21% improvement in fuel conversion e ciency and 31.11% and 13.94% reduction in CO and NOx emissions, respectively. At the speed of 2000 rpm, fuel conversion e ciency improved by 4.11% and CO emission decreased by 18.73%, while NOx concentration increased by 28.35%.

show abstract

Experimental and Numerical Investigation on the Laminar Flame Speed of CH4/O2 Mixtures Diluted With CO2 and H2O

Cited by 50 publications

References 51 publications

Experimental investigation of burning velocities of ultra-wet methane–air–steam mixtures

Experimental investigation of burning velocities of ultra-wet methane–air–steam mixtures

Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure

Performance and emissions optimization of an ethanol-gasoline fueled SI engine with oxygen enrichment using artificial bee colony algorithm

Contact Info

Product

Resources

About