Zero-dimensional analysis of diluted oxidation of methane in rich conditions

Joannon, M. de; Saponaro, Alessandro; Cavaliere, Antonio

doi:10.1016/s0082-0784(00)80562-7

Cited by 87 publications

(67 citation statements)

References 7 publications

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“…Again, the negative F I CO and F I H 2 do not correspond to a diffusion flame here, but to a local generation of CO and H 2 . Supporting this observation, the high concentration of CO and H 2 have also been found in the furnace or well-stirred reactor (WSR) under MILD combustion conditions by other experimental [56] and numerical [12] studies. In the DSHC experimental results, the inner flame is only detectable at axial locations from 30 mm onward, because the heat release from this inner flame front, has been partially compensated by the heat loss due to droplet evaporation.…”

Section: Flame Structuresupporting

confidence: 57%

Transported PDF Modeling of Ethanol Spray in Hot-Diluted Coflow Flame

Naud

Roekaerts

2015

Flow Turbulence Combust

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This paper presents a numerical modeling study of one ethanol spray flame from the Delft Spray-in-Hot-Coflow (DSHC) database, which has been used to study Moderate or Intense Low-oxygen Dilution (MILD) combustion of liquid fuels (Correia Rodrigues et al. Combust. Flame 162, 759-773, 2015). A "Lagrangian-Lagrangian" approach is adopted where both the joint velocity-scalar Probability Density Function (PDF) for the continuous phase and the joint PDF of droplet properties are modeled and solved. The evolution of the gas phase composition is described by a Flamelet Generated Manifold (FGM) and the interaction by exchange with the mean (IEM) micro-mixing model. Effects of finite conductivity on droplet heating and evaporation are accounted for. The inlet boundary conditions starting in the dilute spray region are obtained from the available experimental data together with the results of a calculation of the spray including the dense region using ANSYS Fluent 15. A method is developed to determine a good estimation for the initial droplet temperature. The inclusion of the "1/3" rule for droplet evaporation and dispersion models is shown to be very important. The current modeling approach is capable of accurately predicting main properties, including mean velocity, droplet mean diameter and number density. The gas temperature is under-predicted in the region where the enthalpy loss due to droplet evaporation is important. The flame structure analysis reveals the existence of two heat release regions, respectively having the characteristics of a premixed and a diffusion flame. The experimental and modeled temperature PDFs are compared, highlighting the capabilities and limitations of the proposed model.

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Section: Flame Structuresupporting

confidence: 57%

Transported PDF Modeling of Ethanol Spray in Hot-Diluted Coflow Flame

Naud

Roekaerts

2015

Flow Turbulence Combust

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“…Katsuki and Hasegawa [5] studied MILD combustion in a heat recirculating semi industrial furnace to find this technique as highly energy efficient and with significantly low NOx emissions. De Joannon et al [6] studied the applicability of existing reaction mechanisms to study MILD combustion technique.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

Frassoldati

Sharma

Cuoci

et al. 2010

Applied Thermal Engineering

132

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“…They found that there is a dramatic effect on the combustion composition, depending on the composition of the diluent. Also the effect of the residence time on the reaction was of no significance for the majority of the temperature range 500 -2000 K. However as identified in their work, De Joannon et al (2000), acknowledge that a wellstirred reactor is unfeasible for a practical combustor.…”

Section: Mild Combustion Studiesmentioning

confidence: 95%

“…MILD combustion is frequently described as appearing weak, with diffuse and distributed reactions zones (Katsuki & Hasegawa, 1998). The visible emission from MILD combustion is measured to be two orders of magnitude lower than from conventional flames (De Joannon et al, 2000). In the case of methane, the predominate sources of colour in typical flames is due to C2 and CH, both of which are formed at relatively high temperatures, which are avoided in MILD conditions, therefore the lack of colour (Cavaliere & De Joannon, 2004).…”

Section: Characteristics Of Mild Combustionmentioning

confidence: 99%