Laminar Burning Velocity of Methane/Air Mixtures and Flame Propagation Speed Close to the Chamber Wall

Pizzuti, Loreto; Martins, Cristiane Aparecida; Santos, Leila Ribeiro dos; Guerra, Danielle R S

doi:10.1016/j.egypro.2017.07.145

Cited by 27 publications

(17 citation statements)

References 17 publications

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“…Even for simple fuels such as methane and for standard atmospheric conditions, there are non-negligible differences in global quantities, such as the laminar unstretched flame speed S L obtained from different chemical mechanisms, reaching differences of up to 10%. A similar order of magnitude is reported for the uncertainty in experimental measurements of S L [7]. It becomes clear from the foregoing discussion that it is impossible to choose the one, correct physical system that can be represented by a combustion DNS.…”

Section: Introductionsupporting

confidence: 68%

“…Equation (7) indicates that ∇ • → u and a T are (for a N ≈ const) expected to correlate positively, and because of the negative correlation between ∇ • → u and κ m , a negative correlation between a T and κ m is obtained as a result of streamline divergence or convergence in front of curved regions in premixed flames [52]. A negative (positive) correlation between κ m and a general quantity Q in general implies a positive (negative) correlation between a T and Q due to the negative correlation between a T and κ m .…”

Section: Resultsmentioning

confidence: 99%

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Comparison of Flame Propagation Statistics Extracted from Direct Numerical Simulation Based on Simple and Detailed Chemistry—Part 1: Fundamental Flame Turbulence Interaction

et al. 2021

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In the present study, flame propagation statistics from turbulent statistically planar premixed flames obtained from simple and detailed chemistry, three-dimensional Direct Numerical Simulations, were evaluated and compared to each other. To this end, a new database was established encompassing five different conditions on the turbulent premixed combustion regime diagram, using nearly identical numerical methods and the same initial and boundary conditions. A detailed discussion of the advantages and limitations of both approaches is provided, including the difference in carbon footprint for establishing the database. It is shown that displacement speed statistics and their interrelation with curvature and tangential strain rate are in very good qualitative and reasonably good quantitative agreement between simple and detailed chemistry Direct Numerical Simulations. Hence, it is concluded that simple chemistry simulations should retain their importance for future combustion research, and the environmental impact of high-performance computing methods should be carefully chosen in relation to the goals to be achieved.

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Section: Introductionsupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Comparison of Flame Propagation Statistics Extracted from Direct Numerical Simulation Based on Simple and Detailed Chemistry—Part 1: Fundamental Flame Turbulence Interaction

et al. 2021

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“…At fixed spark timing, both the combustion phasing and combustion duration ( Figures 5c and 5d, respectively) progressively increase. This is due to the lower flame speed of methane [23]. The knock intensity (Figure 6b) falls below the borderline knock threshold when the PFI (methane) injection duration exceeds approximately 4 milliseconds (corresponding to a methane fuel fraction of approximately 25%).…”

Section: Duel-fuel Mixture Sweeps At Wot With Fixed Spark Timingmentioning

confidence: 96%

Dual-fuel operation of gasoline and natural gas in a turbocharged engine

Singh

Morganti

Dibble

2019

Fuel

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Natural gas is a high-octane fuel that produces lower CO 2 emissions per kilowatt hour than liquid transport fuels, with essentially zero sulfur emissions. Historically, natural gas has mostly been used in power generation and industrial applications. However, there has been a recent shift towards employing natural gas in the transport sector. In many developing countries, existing vehicles are retrofitted with compressed natural gas (CNG) systems, enabling operation on both gasoline and natural gas (and theoretical mixtures thereof). This work examines the effect of leveraging the secondary natural gas fuel system on the performance, efficiency and broader environmental impact of a high specific output gasoline engine. Firstly, mixture sweeps are presented for varying gasoline/natural gas ratios (100% gasoline to 100% natural gas) at wide open throttle (WOT) with both fixed and variable spark timing. This baseline information is then used to optimize the engine calibration for varying gasoline/natural gas ratios over a wider range of operating conditions. Finally, the CO 2-equivalent emissions are computed to elucidate the broader environmental impact of an optimized gasoline/natural gas vehicle. This study suggests that more advanced control systems which enable vehicles to use both gasoline and natural gas simultaneously may provide a range of social, economic and environmental benefits.

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“…The image analysis is done in two stages, the first responsible for determining the flame front radius time evolution and the second being responsible for determining L b and S u 0 by linear extrapolation. The experimental setup and post-processing tools have been validated using CH 4 /air mixtures at 1 bar and ambient temperature (Pizzuti et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

Experimental determination of laminar burning velocity of biogas at pressures up to 5 Bar

Pizzuti

Martins

Santos

2017

Procceedings of the 24th ABCM International Congress of Mechanicl Engineering

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This paper presents a very detailed description of a new cylindrical constant volume combustion chamber designed for laminar burning velocity determination of gaseous mixtures at ambient temperature and initial pressure up to 6 bar. The experimental setup, the experimental procedure and the determination of the range of flame radius for laminar burning determination are all described in details. The laminar burning velocity of twelve synthetic biogas mixtures has been studied. Initial pressure varying between 1 and 5 bar, equivalence ratios,  between 0.7 and 1.1 and percentage dilution, with a mixture of CO 2 and N 2 , between 35 and 55% have been considered. Five experiments were run for each mixture providing a maximum percentage standard deviation of 8.11%. However, for two third of the mixtures this value is lower than 3.55%. A comparison with simulation using PREMIX for both GRI-Mech 3.0 and San Diego mechanisms has provided closer agreement for mixtures with equivalence ratio closer to stoichiometry whereas for  = 0.7 the deviation is larger than 15% for all pressures. Mixtures with lower equivalence ratio, higher dilution percentage and higher initial pressure presents the lower values of laminar burning velocity.

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Laminar Burning Velocity of Methane/Air Mixtures and Flame Propagation Speed Close to the Chamber Wall

Cited by 27 publications

References 17 publications

Comparison of Flame Propagation Statistics Extracted from Direct Numerical Simulation Based on Simple and Detailed Chemistry—Part 1: Fundamental Flame Turbulence Interaction

Comparison of Flame Propagation Statistics Extracted from Direct Numerical Simulation Based on Simple and Detailed Chemistry—Part 1: Fundamental Flame Turbulence Interaction

Dual-fuel operation of gasoline and natural gas in a turbocharged engine

Experimental determination of laminar burning velocity of biogas at pressures up to 5 Bar

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