Showing papers in "Combustion and Flame in 1970"

TL;DR: In this article, the authors discuss the factors affecting the pyrolysis process of wood and its constituent substances, including composition effects, catalysis and autocatalysis, effects due to the physical structure of wood, and changes in experimental conditions.

TL;DR: In this article, the authors studied the oxidation of methane behind reflected shock waves in the temperature range of 1350° to 1900°K, using a thirteen-step reaction mechanism, and calculated the time rate of change of concentrations and thermodynamic properties by numerically integrating the system of reaction kinetic and state equations.

TL;DR: In this article, the surface reaction rate of coal chars was measured for a range of eleven coals, high rank and low rank, swelling and nonswelling, using a luminar flow furnace technique described in an earlier paper.

TL;DR: The validity of light-scatter measurements as a basis for determining soot particle size and concentration from point to point within a flame has been examined in relation to measurements on a special propane burner as discussed by the authors.

TL;DR: Gas dynamic processes insufficiency for triggering transition to detonation obtained from laser schlieren records of nonsteady flow field ahead of accelerating turbulent flame as mentioned in this paper, which is obtained from a laser scanner.

TL;DR: In this article, it has been shown that the high efficiency of the alkali oxalates is due to their ready decomposition in a flame, with the generation of submicron particles of alkali carbonate.

TL;DR: In this article, Schlieren photographs, together with velocity and turbulence measurements in an isothermal model, show that mixing and entrainment are considerably reduced and that turbulence is damped over the major portion of the flame length.

TL;DR: The experimental results confirming the proton-transfer mechanism of the ammonium perchlorate (AP) thermal decomposition over a wide temperature range are presented in this paper, where it is shown by use of a time-of-flight mass spectrometer that the primary products of the thermal degradation of AP are ammonia and perchloric acid.

TL;DR: In this paper, the problem of laboratory assessment of the relative effectiveness of gaseous and powdered agents in chemically inhibiting real fires is approached by use of the recently developed counterflow diffusion flame.

TL;DR: In this paper, the relative rates of consumption of CH4 and H2 in slowly reacting mixtures of H2 + O2 + N2 at 500°C have been measured over a wide range of mixture composition and at several pressures.

TL;DR: In this paper, a burning rate law for wood spheres with forced convection was obtained by utilizing a constant drag coefficient model for a firebrand, and trajectories were obtained for firebrands in two fluid flow fields of interest in forest fire research.

TL;DR: In this paper, a detailed analysis of the results gives k15/k31 = 21 ± 2, k41/k101 2 = (5.8 ± 1.5) × 10−4 (mm Hg)−1,2 sec−1 2 = 0.012 (liter mole−1sec−12 at 440 °C).

TL;DR: In this paper, a previous study of nitric oxide formation in fuel-lean mixtures using the NO + O continuum technique has been extended to fuel-rich mixtures and the results of the experiment show that the bulk of NO production occurs in the burned gas and that the contribution of the flame zone is negligible over the range of equivalence ratios 0.85 ≤ φ ≤ 1.1.

TL;DR: In this paper, a laminar boundary layer over a flat pool of liquid fuel is calculated for a single-stage liquid pool of fuel at a super-flash temperature subjected to a cross wind, and the boundary is bounded by the lean mixture limit or the blowoff limit of the local fuel-air mixture.

TL;DR: A detailed kinetic and analytical study has been made at 540°C, and the results compared with more limited study of 440°C as discussed by the authors, showing that CH4 is a major product and significant yields of C2H6, H2, and CH3O2.

TL;DR: In this article, the thermal decomposition of copper chromate and chromite has been examined by simultaneous thermogravimetric analysis and differential thermal analysis and it has been shown that both ultimately yield cuprous chromite and cuprous oxide.

TL;DR: The time to the appearance of detonation in three experiments with shocks of nominal initial pressures of 65.62 and 60 kilobars was approximately 10, 16, and 20 μsec, respectively.

TL;DR: In this paper, two flat plates inserted in a 5-in. spherical cavity were used to measure quenching distances for five propane-air mixtures as a function of pressure from 3 to 90 atm.

TL;DR: In this article, a new analysis of radical recombination rates in hydrogen-oxygen flames was presented, which takes into account the rates of the reverse reactions and utilizes an improved technique for obtaining individual rate constants from the overall rates.

TL;DR: The extent of decomposition of particles of alumina injected into a thermal induction plasma of either pure argon or of argon containing 4% or 8% nitrogen has been determined as a function of the distance traveled by the particles within the plasma.

TL;DR: In this article, a 1-in-diameter water-cooled porous metal flat-flame burner was used to determine burning velocities for a wide range of methane-air mixtures, including lean mixtures for which reliable data were not previously available.

TL;DR: In this article, the authors investigated the effect of back-mixing on the amount of soot generated by rich premixed hydrocarbon flames by comparing the yields of a flat flame burner and a spherical reactor.

TL;DR: In this paper, it was suggested that twin-slit inverted flame burners with extremely thin stabilization plates should permit the accurate determination of critical values of Karlovitz flame stretch factor.

TL;DR: In this paper, the authors used the concept of flame stretch in the stabilization zone of inverted flames and cylindrical burner rims to test the flame stretch theory of blowoff.

TL;DR: In this article, the homogeneous decomposition of H2O2 vapor is a non-chain process, and a chain reaction occurs in the presence of H 2, as a result of the reaction OH + H2 = H 2O + H (1), followed by H + H 2 O2 + M = HO 2 + M (2) and OH + O (3).

TL;DR: In this article, it was shown that carbon formation in ethanol-air diffusion flames occurs preferentially from the non-hydroxylated carbon atom of the ethanol molecule, which is based on previous experimental observations and theoretical considerations.

TL;DR: In this article, the authors present data for a wide variety of simple fuel gases with and without inert diluents, and show that at high fuel supply rates the data tend to correlate independently of the air requirement of the fuel; at low supply rates, the data tends to correlate independent of volumetric supply rate.