Showing papers in "Combustion and Flame in 2009"

TL;DR: In this article, detailed chemical reaction mechanisms have been developed to describe the pyrolysis and oxidation of nine n-alkanes larger than n-heptane, including n-octane (n-C8H18), n-nonane, n-decane, and n-hexadecane.

TL;DR: In this paper, a detailed reaction mechanism for small hydrocarbons combustion with possibly full implementation of available kinetic data related to the prompt NO route via NCN was presented, which can accurately predict the NO formation in lean and rich flames of methane, ethylene, ethane and propane.

TL;DR: In this article, various factors affecting the determination of laminar flames speeds from outwardly propagating spherical flames in a constant-pressure combustion chamber were considered, with emphasis on the nonlinear variation of the stretched flame speed to the flame stretch rate, and the associated need to nonlinearly extrapolate the stretched flames speed to yield an accurate determination of the Laminar flame speed and Markstein length.

TL;DR: In this paper, a chemical mechanism for the high temperature combustion of a wide range of hydrocarbon fuels ranging from methane to iso-octane was presented and validated against a series of experimental data sets including laminar burning velocities and ignition delay times.

TL;DR: In this article, the effect of nonzero burned gas velocities on the measured flame speed in cylindrical chambers is investigated experimentally and theoretically, and a methodology is applied to correct the flame speed for nonzero gas speeds, in order to extend the range of flame radii useful for flame speed measurements.

TL;DR: In this article, the effects of particle size, equivalence ratio, and chemical kinetics on the burning characteristics and flame structures of aluminum-particle/air mixtures were investigated.

TL;DR: An experimental and modeling study of 11 premixed NH 3 /CH 4 /O 2 /Ar flames at low pressure (4.0 ) with the same equivalence ratio of 1.0 is reported in this article.

TL;DR: In this article, the effect of high CO 2 concentration on ammonia conversion was investigated in a flow-robot flow reactor and the results have been interpreted in terms of an updated detailed chemical kinetic model.

TL;DR: In this article, the authors used the constant volume bomb method to determine laminar burning velocities and Markstein lengths under engine-relevant conditions by using spherical flames of n -heptane, iso-octane, PRF 87 and gasoline/air mixtures.

TL;DR: In this paper, the authors presented new experimental data for n-butanol in three experimental configurations, including an improved detailed chemical kinetic mechanism (878 reactions involving 118 species) derived from a previously proposed scheme in the literature.

TL;DR: In this paper, large-Eddy simulation (LES) has been used to analyze the occurrence and the causes of cycle-to-cycle combustion variations in a spark ignited four-valve single cylinder engine fueled with a homogeneous propane-air mixture.

TL;DR: In this paper, a relatively short kinetic mechanism (93 species and 729 reactions) was developed to predict the formation of poly-aromatic hydrocarbons and their growth of up to five aromatic rings in methane and ethane-fueled flames.

TL;DR: In this article, a series of experiments were conducted on a single-cylinder research engine investigating the influence of molecular structure on the combustion behavior of fatty acid alcohol ester (biodiesel) molecules under diesel engine conditions.

TL;DR: In this paper, a numerical model capable of representing the spatial distribution of vegetation in a tree crown is presented and evaluated against tree burning experiments in the Large Fire Laboratory of the National Institute of Standards of Technology.

TL;DR: In this article, the effects of flow strain rate and equivalence ratio on the chemiluminescent intensities of electronically excited OH (A{sup 2 sigma}, denoted as OH{sup *}) and CH (A {sup 2 ndelta}, referred as CH{sup*}) species in laminar premixed and non-premixed counterflow methane-air flames, at atmospheric pressure, are studied.

TL;DR: The Hybrid Method of Moments (HMOM) as discussed by the authors combines the advantages of MOMIC and DQMOM to capture bimodal NDF while retaining ease of implementation and numerical robustness.

TL;DR: In this paper, a model of burning of two widely-used charring and intumescing polymers, bisphenol A polycarbonate and polyvinyl chloride, was developed and validated.

TL;DR: In this paper, a chemical looping combustion process for coal using interconnected fluidized beds with inherent separation of CO 2 is proposed, where the configuration comprises a high velocity fluidized bed as an air reactor, a cyclone, and a spout-fluid bed as a fuel reactor.

TL;DR: In this article, the performance and stability characteristics of a parallel jet MILD (Moderate or Intense Low-oxygen Dilution) combustion burner system in a laboratory-scale furnace are described.

TL;DR: In this paper, the principal burning characteristics of a laminar flame comprise the fuel vapour pressure, the burning velocity, ignition delay times, Markstein numbers for strain rate and curvature, the stretch rates for the onset of flame instabilities and of flame extinction for different mixtures.

TL;DR: In this article, an experimental investigation of the combustion characteristics of boron nanoparticles in the post flame region of a flat flame burner has been conducted, and the measured burning times were between 1.5 ms and 3.0 ms depending on both the temperature and oxygen mole fraction.

TL;DR: In the present study of a variety of premixtures, with different functional relationships, such gradients comprise fixed initial temperature gradients, the smaller the ratio of the acoustic speed through the mixture to the localised velocity of the autoignitive front, the greater are the amplitude and frequency of the induced pressure wave.

TL;DR: In this article, three different methodologies used for the extraction of laminar information are compared and discussed, and the new methodology has proven to be the most robust and provides the most accurate results, while the polynomial methodology induces some errors due to the differentiation process.

TL;DR: The effect of blockage ratio on the early phase of the flame acceleration process in an obstructed square cross-section channel was investigated in this paper, and it was determined that flame acceleration is more pronounced for higher blockage obstacles during the initial stage of flame acceleration up to a flame velocity below the speed of sound of the reactants.

TL;DR: In this article, the requirements for sustained propagation of spark-ignited hydrogen-air and butane-air flames at atmospheric and elevated pressures were investigated, and it was shown that sustained propagation is always possible for mixtures whose Lewis number is less than unity, as long as a flame can be initially established.

TL;DR: A burner-stabilized, stagnation flame technique is introduced in this paper, where a previously developed sampling probe is combined with a water-cooled circular plate such that the combination simultaneously acts as a flow stagnation surface and soot sample probe for mobility particle sizing.

TL;DR: In this article, nano-aluminium particles of ∼50nm size, produced at this laboratory, are added to composite solid propellants based on ammonium perchlorate and hydroxyl-terminated poly-butadiene binder that exhibit plateau burning rate trends and those including burning rate catalysts.

TL;DR: In this article, a general flamelet transformation that holds in the limits of both premixed and non-premixed combustion is developed, which makes use of two statistically independent variables: a mixture fraction and a reaction progress parameter.

TL;DR: In this paper, a new species reduction method called the Simulation Error Minimization Connectivity Method (SEM-CM) was developed, where a mechanism building procedure is started from the important species.

TL;DR: In this article, both the Chemical Percolation Devolatilization (CPD) model and the char combustion intrinsic reactivity model have been adapted to Guasare coal combusted.