Showing papers in "Combustion and Flame in 2003"

TL;DR: In this paper, the effects of fuel structure and additives on the homogeneous charge compression ignition (HCCI) of pure hydrocarbon fuels and mixtures under well-determined conditions were studied.

TL;DR: In this paper, the dependence of the soot oxidation rate upon the length and curvature of the graphene segments, which depicts the nanostructure, is shown, and different soot nanostructures are readily produced by using different fuels and pyrolysis conditions.

TL;DR: In this paper, convective effects of the flow modulations propagating upstream of a premixed laminar flame are considered and a unified model is derived analytically, based on a linearization of the G-equation for an inclined flame.

TL;DR: In this article, a reduced chemical kinetic model that included 32 species and 55 reactions was used and the affect of wall heat transfer on the temperature of the adiabatic core gas was taken into account by adding the displacement volume of the laminar boundary layer to the cylinder volume.

TL;DR: In this article, a simple first-principles model of counter current heat-recirculating combustors is developed, including the effects of heat transfer from the product gas stream to the reactant stream, heat loss to ambient, and heat conduction in the streamwise direction through the dividing wall (and heat transfer surface).

TL;DR: In this paper, a spectral formalism has been developed for the non-intrusive analysis of parametric uncertainty in reacting-flow systems, which quantifies the extent, dependence and propagation of uncertainty through the model system and allows the correlation of uncertainties in specific parameters to the resulting uncertainty in detailed flame structure.

TL;DR: In this paper, the results of computations with detailed chemical kinetic schemes for the autoignition of stoichiometric H2CO-air and H2-air mixtures at high pressure and high temperature are reported, with and without a single hot spot.

TL;DR: In this paper, the authors investigated the chemical effects of CO2 replacement of N2 in air on the burning velocity of lean to stoichiometric CH4/O2/N2/ CO2 and H2/O 2/N 2/CO2 mixtures at 1 atm.

TL;DR: In this article, the soot particle size distribution function (PSDF) was measured in a laminar premixed ethylene-argon-oxygen flame (φ = 2.07) using a scanning mobility particle sizer.

TL;DR: In this paper, an analysis of the ignition of H2− and CH4− containing mixtures at high temperatures under the action of a nanosecond highvoltage discharge has been performed both numerically and experimentally for a wide range of parameters.

TL;DR: In this article, a general and detailed chemical kinetic model has been developed and tested to investigate the interaction between NO and hydrocarbons during the oxidation of a hydrocarbon at low temperatures.

TL;DR: The heat flux method for determining the adiabatic burning velocity of gaseous mixtures of fuel and oxidizer and also producing well-defined reference flames is described in detail as mentioned in this paper.

TL;DR: In this article, a detailed analysis of the hydrocarbon adsorption-desorption and oxidation behavior of diesel particulate emitted by a modern diesel engine and collected on a SiC diesel filter is performed by use of thermogravimetric and differential scanning calorimetry analysis (TGA-DSC) non-isothermal tests were performed with samples collected directly from a ceramic filter connected to the exhaust system of the diesel engine running under low and medium speed and load operating conditions with and without fuel additive.

TL;DR: In this article, the authors investigate the role of radical build-up in high-temperature, fuel-lean mixtures and show that the relative roles of reaction and diffusion are investigated by tracking the evolution of four representative ignition kernels.

TL;DR: In this paper, an efficient stochastic approach to solve the population balance equation that describes the formation and oxidation of soot particles in a laminar premixed flame is introduced.

TL;DR: In this paper, the authors evaluated the spontaneous combustion characteristics of Askale lignite from Turkey using Crossing Point Methods adapted to our laboratories conditions, and determined the three predominant oxygen functional groups (carboxyl, hydroxyl and carbonyl) in untreated and moist coal samples with wet chemical methods.

TL;DR: In this paper, an experimental study of premixed, turbulent, gaseous explosion flames in a fan-stirred bomb is reported, and various definitions are scrutinized and different flame radii presented, along with the associated turbulent burning velocities.

TL;DR: In this article, a combined experimental and numerical investigation on the effects of H2 addition to lean-premixed CH4 flames in highly strained counterflow fields using preheated flows indicate significant enhancement of lean flammability limits and extinction strain rates for relatively small amounts of H 2 addition.

TL;DR: In this article, an optimization-based approach to kinetic model reduction is presented, where the reaction-elimination problem is formulated as a linear integer program which can be solved to guaranteed global optimality.

TL;DR: In this article, a method was developed to determine the stability map of laminar premixed flames using the response of both the burner and the flame to forced oscillations of the flow.

TL;DR: In this article, the results from a one-dimensional computational study on flame stabilization in a two-section porous burner are predicted for a range of equivalence ratios and are compared to experimental values.

TL;DR: The mechanism of coal oxidation at low temperatures, i.e., below 100°C, was examined using measurements of the gases emitted from a bed of coal in an isothermal flow reactor as discussed by the authors.

TL;DR: In this article, the authors investigated the minimum energy necessary to ignite a laminar premixed methane air mixture experimentally using a Q-switched Nd:YAG laser with an anti-reflection-coated lens.

TL;DR: In this article, a non-luminous turbulent jet diffusion flame is numerically simulated using a Reynolds stress second-order closure, the steady laminar flamelet model, and different approaches for radiative transfer.

TL;DR: In this article, a detailed chemical kinetic scheme was developed and validated to investigate the interactions between NO and simple hydrocarbons during thermal oxidation and reburning, which describes accurately the influence of NO in a wide temperature range, for different fuels and stoichiometry conditions.

TL;DR: In this paper, a detailed kinetic model consisting of 107 reactions and 30 species was proposed, which includes the oxidation and chlorination of key flue-gas components, as well as six mercury reactions involving HgO with new reaction rate constants calculated neither from experimental data nor by estimated, but directly from transition state theory.

TL;DR: In this paper, the authors studied the properties of forward combustion fronts propagating at a constant velocity in the presence of heat losses and derived expressions for temperature and concentration profiles and the velocity of the combustion front, under both adiabatic and non-adiabatic conditions.

TL;DR: In this article, the initial stages of soot oxidation were studied experimentally in laminar hydrocarbon/air diffusion flames at atmospheric pressure, and the following properties were measured as a function of distance above the burner exit: soot concentrations by deconvoluted laser extinction, soot temperatures by de-voluted multiline emission and soot structure by thermophoretic sampling and analysis using Transmission Electron Microscopy (TEM), concentrations of stable major gas species (N2, H2O, H 2O, O2, CO, CO2