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Showing papers in "Combustion and Flame in 1981"


Journal ArticleDOI
TL;DR: In this paper, a simple method of calculating the elemental stoichiometric coefficient, φe has been developed, which can easily be applied to multicomponent fuel-oxidizer compositions.

1,062 citations


Journal ArticleDOI
TL;DR: In this article, the authors present a mechanism for soot formation in a premixed laminar flame, where chemiions are assumed to be the precursor on which the free radicals, polyacetylenes, and polycyclic aromatic hydrocarbons repeatedly add in fast ion-molecule reactions.

351 citations


Journal ArticleDOI
TL;DR: In this article, the effects of different methods of approximating multispecies transport phenomena in models of premixed, laminar, steady-state flames have been studied.

272 citations


Journal ArticleDOI
TL;DR: In this article, a comprehensive survey of the refractive indices and dispersions of gases that are found in practical or laboratory combustion experiments is reported; a critical evaluation was used to obtain recommended values where experimental data are available; where they are not, sums of atomic and bond refractivities were used.

230 citations


Journal ArticleDOI
TL;DR: In this paper, a laminar flame quenching at the cold wall of a combustion chamber has been studied, using a numerical model to describe the reactive flow, combining an unsteady treatment of fluid mechanics and a detailed chemical reaction mechanism.

190 citations


Journal ArticleDOI
TL;DR: In this paper, a chemical kinetic model has been developed which explains the important features of the reaction between ammonia and nitric oxide in the presence of oxygen, and the role of excess oxygen and the effect of adding hydrogen are also explained by the model.

188 citations


Journal ArticleDOI
TL;DR: In this paper, a simple model of the ceiling flow induced by fire centrally located at the floor between two long unobstructed ceiling beams of such depth that no fire gases are able to leak to adjacent beam channels is presented.

179 citations


Journal ArticleDOI
TL;DR: In this paper, a model for the structure of a wind-blown, turbulent flame from a line fire in which buoyancy is the principal source of vertical momentum is developed, with rate proportional to the strain rate of the mean streamlines of the flame fluid flow.

147 citations


Journal ArticleDOI
TL;DR: In this paper, an earlier theoretical study of the dynamic behavior of a single carbon particle in a hot ambient is extended to include the effects of water vapor and hydrogen, and three heterogeneous reactions involving the consumption of carbon by oxygen, carbon dioxide, and water are included for both frozen and equilibrium chemistry in the gas phase.

128 citations


Journal ArticleDOI
TL;DR: In this article, the linear stability of two-reactant flames corresponding to cellular structure is considered within the framework of the thermal-diffusive flame model and the effect of both the deficient component and the abundant component is investigated assuming large activation energy of the overall reaction rate.

124 citations


Journal ArticleDOI
TL;DR: In this paper, the feasibility of the use of a plasma jet was investigated for the improvement of flame stabilization and the promotion of combustion of a fuel jet injected into supersonic air streams.

Journal ArticleDOI
TL;DR: In this paper, an experimental and modeling study of the oxidation of H2S was reported, which entailed induction time measurements in reflected shock waves, in 4 to 22% H 2S in air, some of which contained from 1.6 to 13% H2O.

Journal ArticleDOI
TL;DR: In this paper, a correlation for the blowoff velocity of premixed turbulent flames stabilized by bluff bodies is developed using a simple model for coherent structures in turbulent flows, showing the correct trends for variations in equivalence ratio, free stream pressure and temperature, flameholder characteristic size, and turbulent Reynolds number.

Journal ArticleDOI
TL;DR: In this paper, the effects of interaction of two burning identical droplets are investigated using the formulation of Shvab-Zeldovich, one can calculate the burning rate and the form of flame surface in two droplets case.


Journal ArticleDOI
TL;DR: The results of a theoretical study of the homogeneous nucleation of submicron inorganic particles in gases formed by the combustion of coal are reported in this paper, where the conditions for which supersaturation of the combustion gases by an inorganic vapor species above the critical level for homogeneous nuclear fusion of a condensed phase may occur when the gases contain a large number of preexisting particles are considered.

Journal ArticleDOI
TL;DR: In this article, the authors measured the rates of elutriated carbon from a fluidized bed coal combustor 160 mm ID under different operating conditions and determined the content and size distribution of coal particles in the bed.

Journal ArticleDOI
TL;DR: In this article, the statistical properties of turbulence such as turbulence intensities, probability density function, autocorrelation, length scales, and power spectrum are carried out by laser Doppler velocimeter, along with the measurements of gas temperature and gas species concentration in turbulent jet flows with and without flame.

Journal ArticleDOI
TL;DR: In this paper, an asymptotic analysis for the limit of large activation energy is presented to study the thermal inhibition effect on premixed flames by chemically inert dust or spray.

Journal ArticleDOI
TL;DR: In this article, the authors studied the thermal oxidation of methanol-oxygen mixtures, highly diluted with argon, by following infrared emission of various species during the course of the reaction, and obtained the profiles of some species from the numerical integration of 57 reactions and were compared with the measured results.

Journal ArticleDOI
TL;DR: In this article, temperature and composition profiles of fuel, O2, CO, H 2, CO2, H2O, and OH are reported for both atmospheric pressure, premixed, laminar, methane-air, and propane-air flames.

Journal ArticleDOI
TL;DR: In this article, the authors investigated the kinetics of CH4-O2-Ar ignition sensitized by NO2 behind reflected waves in a shock tube and measured the induction times.

Journal ArticleDOI
TL;DR: In this paper, the transient process of laminar flame quenching at a cold wall is studied, where a plane flame is assumed that travels perpendicularly toward the wall and a kinetic model A + B → 2B and 2B → C consists of a chain branching and a chain breaking step.


Journal ArticleDOI
TL;DR: In this article, two-dimensional partial differential equations were numerically integrated to model a laminar flame system, freely propagating between cool parallel plates at constant pressure, and the solution yielded the flame speed and structure at any distance separating the plates.

Journal ArticleDOI
TL;DR: In this paper, the collisional lifetimes of OH (2 Σ +, ν′ = 0) radicals excited by tunable laser pulses have been measured in three different low pressure C 3 H 8  O 2.

Journal ArticleDOI
TL;DR: In this article, a premixed, laminar methane-air flame was excited by a speaker-driver unit, and the gain and the phase of pyro-acoustic amplification were measured with microphones located both upstream and downstream of the flame for parameters of burner port radius, flow velocity, and mixture strength.

Journal ArticleDOI
TL;DR: In this paper, fuel mixture fraction profiles and species concentration profiles (O 2, N 2, CH 4, CO, CO 2, H 2 O, and tracer Ar) were made of turbulent natural gas diffusion flames.

Journal ArticleDOI
TL;DR: In this article, the authors analyzed the interaction between two burning fuel droplets that differ in size using the quasi-steady hypothesis, and solved the problem exactly by use of bispherical coordinates within the framework of the Shvab-Zeldovich formulation.

Journal ArticleDOI
TL;DR: In this paper, a simple idealization of the steady-state deflagration of uncatalyzed, homogeneous solid propellants is examined to determine its adequacy in describing gross combustion features such as burn rate as a function of pressure and initial temperature.