Showing papers in "Combustion and Flame in 1998"

TL;DR: In this article, a detailed chemical kinetic mechanism has been developed and used to study the oxidation of n-heptane in flow reactors, shock tubes, and rapid compression machines, where the initial pressure ranged from 1-42 atm, the temperature from 550-1700 K, the equivalence ratio from 0.3-1.5, and nitrogen-argon dilution from 70-99%.

TL;DR: In this article, the effects of the initial mixture temperature and pressure on these parameters also have been examined and data have been obtained for iso-octane-air mixtures at initial temperatures between 358 K and 450 K, at pressures between 1 and 10 bar, and equivalence ratios, φ, of 0.8 and 1.0.

TL;DR: In this paper, an experimental and detailed chemical kinetic modeling work has been performed to investigate aromatic and polycyclic aromatic hydrocarbons (PAH) formation pathways in a premixed, rich, sooting, n-butane-oxygen-argon burner stabilized flame.

TL;DR: In this paper, the authors investigated the utility of several experimental observables as measurements of local burning and heat release rates for a premixed stoichiometric N2-diluted methane-air flame in two-dimensional unsteady vortical flow.

TL;DR: In this paper, the reduction of nitric oxide by reaction with C1 and C2 hydrocarbons under reducing conditions in a flow reactor has been analyzed in terms of a detailed chemical kinetic model.

TL;DR: In this article, a new mixing model is proposed, which is local in composition space and which seeks to address problems encountered in flows with simultaneous mixing and reaction, where the change in particle composition is determined by particle interactions along the edges of a Euclidean minimum spanning tree (EMST).

TL;DR: In this article, a flamelet formulation for non-premixed combustion that allows an exact description of differential diffusion has been developed, where the main difference is the definition of a mixture fraction variable, which is not related directly to any combination of the reactive scalars, but defined from the solution of a conservation equation with an arbitrary diffusion coefficient.

TL;DR: The Carbon Burnout Kinetic Model (CBK) as mentioned in this paper is a coal-general kinetics package that is specifically designed to predict the total extent of carbon burnout and ultimate fly ash carbon content for prescribed temperature/oxygen histories typical of pulverized coal combustion systems.

TL;DR: In this article, the A-states of CH, OH, and NO in a number of low-pressure, premixed, laminar flow methane flames were determined as a function of height above the burner.

TL;DR: In this article, the chemical evolution of soot precursor particles on the centerline of the laminar ethene diffusion flame has been analyzed using laser microprobe mass spectrometry (LMMS) as they undergo the transition to carbonaceous aggregates.

TL;DR: In this paper, two-dimensional computations of the propagation of a detonation in a low-pressure, argon-diluted mixture of hydrogen and oxygen were performed using a detailed chemical reaction mechanism.

TL;DR: In this paper, the effects of positive flame stretch on the laminar burning velocities of methane/air flames were studied both experimentally and computationally, considering freely (outwardly) propagating spherical Laminar premixed flames.

TL;DR: In this article, the method of moments was extended to include a more complete description of particle coagulation, namely, the transition and continuum regimes as well as the formation and growth of fractal aggregates.

TL;DR: In this article, the Damkohler number effects on gas emissions, localized extinction (LE) in the neck zone, and the structure of the recirculation zone dependency on the flow field were investigated.

TL;DR: In this paper, a simple thermodynamic model based on the piston displacement history was formulated, incorporating the predicted heat transfer to the walls and mass transfer to crevices, and the model predictions agree very well with experimental pressure history under a range of initial pressures and types of different gases.

TL;DR: In this article, the authors describe a system that permits the computer-aided formulation of comprehensive primary mechanisms and simplified secondary mechanisms, coupled with the relevant thermochemical and kinetic data in the case of the gas-phase oxidation of alkanes and ethers.

TL;DR: A lifted laminar axisymmetric diffusion flame is stabilized in the downstream region of a diluted methane jet that is surrounded by a lean methane-air coflow and an outer co-flow of air as discussed by the authors.

TL;DR: In this paper, the laminar-burning velocity of a mixture of carbon dioxide and nitrogen was derived from pressure time measurements made in near zero-gravity conditions in a spherical constant volume chamber.

TL;DR: In this paper, a sequence of PIV images shows the time history of both the vorticity field and the velocity field as vortices of different strength convect through a premixed flame.

TL;DR: In this paper, a new method of coupling reactions and mixing processes based on manifold points with detailed chemistry is developed for efficient computational implementation of combustion chemistry, for use in PDF methods and other applications.

TL;DR: In this paper, the structure and propagation of a methanol (CH3OH)-air triple flame were studied using direct numerical simulations (DNS) and a mixture fraction-temperature phase plane description of the triple flame structure was proposed to highlight some interesting features in partially premixed combustion.

TL;DR: In this article, a streak camera was used to investigate and record the initial stages of kernel formation in a four-stroke single-cylinder typical high-pressure combustion chamber, where the piston was cycled in the cylinder by using an electric motor driven hydraulic ram.

TL;DR: In this article, a new subgrid-scale chemistry model was proposed for non-premixed, turbulent, reacting flows, which predicts filtered chemical species concentrations and filtered reaction rates in a turbulent flow.

TL;DR: The present work introduces a way of embedding a combustion chemical system in a neural network, in such a way that it can be used, with considerable CPU time and RAM memory savings, in fluid-flow-simulation codes.

TL;DR: In this paper, the effects of positive flame stretch on the laminar burning velocities of H2/O 2/O2 flames at normal temperatures and various pressures and nitrogen dilutions were studied both experimentally and computationally.

TL;DR: In this article, the features of the multiwavelength emission technique for the measurement of soot volume fraction and temperature in an ethylene diffusion flame have been investigated, and good agreement was found between the two techniques.

TL;DR: In this article, the extinction of counterflow diffusion flames of air and methane diluted with nitrogen was studied by drop tower experiments and numerical calculation using detailed chemistry and transport properties, and the mechanism of extinction at low stretch rates was radiative heat loss from the flame zone.

TL;DR: In this paper, uncertainty analysis is applied to a supercritical water hydrogen oxidation mechanism to determine the effect of uncertainties in reaction rate constants and species thermochemistry on predicted species concentrations, with all other model parameters and inputs treated as deterministic quantities.

TL;DR: In this paper, the authors used MBMS to map the structure of a fuel-rich C 2 H 4 /O 2 flame and infer new C 2H 4 and C 2 h 3 kinetics.

TL;DR: In this article, a numerical study of the inhibition efficiency of halogenated compounds was carried out for C 1 -2 hydrocarbon-air laminar premixed flames using additive group method.