A high pressure experimental and numerical study of methane ignition

Merhubi, Hilal El; Kéromnès, Alan; Catalano, Gianni; Lefort, Benoîte; Moyne, Luis Le

doi:10.1016/j.fuel.2016.03.016

Cited by 65 publications

(33 citation statements)

References 45 publications

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“…Bushe [19], Kim et al [20], Huang et al [21] and Merhubi et al [22]. The Mech_56.54 mechanism tends to capture the overall trend of i variations better than those of the GRI Mech3.0 model, particularly at the lower temperatures.…”

Section: Reduced Global Schemementioning

confidence: 97%

Computation of methane/air ignition delay and excitation times, using comprehensive and reduced chemical mechanisms and their relevance in engine autoignition

Bates

Bradley

Gorbatenko

et al. 2017

Combustion and Flame

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Ignition delay time, i, and excitation time, e, for CH4/air mixtures are mathematically modelled, using a comprehensive chemical kinetic scheme and a reduced global model. A principal objective is to obtain relevant data for this important engine fuel, to assess its propensity to knocking combustion in comparison with that of other fuels. Severe knock is associated with an intense heat release rate during the excitation time, e, short enough for it to feed into, and strengthen, the pressure wave arising from the rate of change of the heat release rate at a hot spot. This assessment is quantified by loci of possible hot spot autoignitions, relative to the detonation peninsula on a / diagram based on i and e. A second objective is to assess the accuracy and practical usage of the reduced global model. Appropriate selection of the controlling parameters for the seven equation global model gave predictions of i close to those of both the complete kinetic scheme and experimental data in the literature. Much smaller time increments are required for the modelling of e, but even with separately selected rate parameterisations for the prediction of i, and e values, the global model predictions of e were only within an order of magnitude of those from the comprehensive kinetic scheme. However, computational times were about ten times faster with the global model, rendering it suitable for the computation of i within 3D reactive transport simulations. Stoichiometric CH4/air displayed very good antiknock properties in comparison with other fuels under turbocharged engine running conditions. Data on i and e from several sources are combined with a tentative hot spot structure, to assess the proximity of the deflagrative and autoignitive regimes, and the bounds of the transition regime.

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Section: Reduced Global Schemementioning

confidence: 97%

Computation of methane/air ignition delay and excitation times, using comprehensive and reduced chemical mechanisms and their relevance in engine autoignition

Bates

Bradley

Gorbatenko

et al. 2017

Combustion and Flame

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“…The experiments were performed with mixtures of mhx3d (1 %) + O2 diluted in argon at equivalence ratios of  = 0.6, 1.2 and 2.4. The experimental facility represents a stainless-steel tube with an inner diameter of 50 mm and separated by a double stainless-steel diaphragm into two parts, the driver section (4 m in length) and the driven section (5 m in length) [29]. The facility is shown schematically in Supplementary Material 2 Fig.…”

Section: Ignition Delay Times Measurements In a Shock Tubementioning

confidence: 99%

Methyl-3-hexenoate combustion chemistry: Experimental study and numerical kinetic simulation

Gerasimov

Knyazkov

Bolshova

et al. 2020

Combustion and Flame

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Due to the lack of experimental data in the literature for the previously-mentioned conditions and mixture compositions, an indirect approach is applied in order to validate the computations. In total, 31 experimental datasets from the literature [58,[61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78] are used, as depicted in Table 3, in order to validate the chosen mechanisms (Table 2) at atmospheric conditions, as well as at elevated temperatures (up to 2085 K) and pressures (up to 5.1 MPa). The validation results are shown in Figure 4.…”

Section: Comparison Of Fundamental Combustion Propertiesmentioning

confidence: 99%

A Study on Electrofuels in Aviation

et al. 2018

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Abstract:With the growth of aviation traffic and the demand for emission reduction, alternative fuels like the so-called electrofuels could comprise a sustainable solution. Electrofuels are understood as those that use renewable energy for fuel synthesis and that are carbon-neutral with respect to greenhouse gas emission. In this study, five potential electrofuels are discussed with respect to the potential application as aviation fuels, being n-octane, methanol, methane, hydrogen and ammonia, and compared to conventional Jet A-1 fuel. Three important aspects are illuminated. Firstly, the synthesis process of the electrofuel is described with its technological paths, its energy efficiency and the maturity or research need of the production. Secondly, the physico-chemical properties are compared with respect to specific energy, energy density, as well as those properties relevant to the combustion of the fuels, i.e., autoignition delay time, adiabatic flame temperature, laminar flame speed and extinction strain rate. Results show that the physical and combustion properties significantly differ from jet fuel, except for n-octane. The results describe how the different electrofuels perform with respect to important aspects such as fuel and air mass flow rates. In addition, the results help determine mixture properties of the exhaust gas for each electrofuel. Thirdly, a turbine configuration is investigated at a constant operating point to further analyze the drop-in potential of electrofuels in aircraft engines. It is found that electrofuels can generally substitute conventional kerosene-based fuels, but have some downsides in the form of higher structural loads and potentially lower efficiencies. Finally, a preliminary comparative evaluation matrix is developed. It contains specifically those fields for the different proposed electrofuels where special challenges and problematic points are seen that need more research for potential application. Synthetically-produced n-octane is seen as a potential candidate for a future electrofuel where even a drop-in capability is given. For the other fuels, more issues need further research to allow the application as electrofuels in aviation. Specifically interesting could be the combination of hydrogen with ammonia in the far future; however, the research is just at the beginning stage.

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A high pressure experimental and numerical study of methane ignition

Cited by 65 publications

References 45 publications

Computation of methane/air ignition delay and excitation times, using comprehensive and reduced chemical mechanisms and their relevance in engine autoignition

Computation of methane/air ignition delay and excitation times, using comprehensive and reduced chemical mechanisms and their relevance in engine autoignition

Methyl-3-hexenoate combustion chemistry: Experimental study and numerical kinetic simulation

A Study on Electrofuels in Aviation

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