Showing papers in "Combustion and Flame in 1966"

TL;DR: In this article, a free jet of methane emerging from a conventional circular burner into an unconfined atmosphere is studied, and it appears that the base of a lifted diffusion flame anchors in a region where a stoichiometric composition is attained.

TL;DR: In this article, the effects of antimony trioxide plus sufficient chlorine were compared in polyethylene, and it was shown that the maximum effect requires about 0·01 antimony atoms per C2 group in the polyethylenes and develops just as well when chlorine/antimony is six as when it is twenty.

TL;DR: In this article, the transient state of a simplified model of a one-dimensional diffusion flame is considered and the governing equations which take into account diffusion, heat conduction, heat losses and finite-rate chemical kinetics are treated numerically to obtain steady-state solutions.

TL;DR: In this article, the results on the numerical calculation of critical hot spot thermal explosion conditions for plane slab, cylindrical and spherical symmetry are reported in the form of a functional relation between the well-known Frank-Kamentsky's criterion δ and the dimensionless temperature of the hot spot θ 0.

TL;DR: In this paper, it was shown that burning polymethyl methacrylate and polyoxymethylene do not react chemically with the gas around them, but merely vaporize in the heat of the surrounding diffusion flames.

TL;DR: In this paper, Schlieren photographs were taken through transparent side walls at turbulence levels ranging from 2 to 14 per cent and at velocities up to 250 ft/sec.

TL;DR: In this article, the Frank-Kamenestky critical ignition parameter was increased by nine percent for wood sawdust in an external concentration of oxygen as low as four per cent v/v.

TL;DR: In this paper, a diffusion-controlled model was used to predict the combustion zone shape of puffed cigarettes and to determine the calorific value of tobacco and tobacco/air stoichiometry, making possible to calculate the smouldering zone temperature.

TL;DR: In this article, a spontaneous explosion of rich mixtures of methane and air has been studied in the pressure range of 58 to 110 atmospheres and at temperatures down to 350°C. The activation energies for both the ignition delay and the rate of slow reaction preceding explosion lay in the range 49 to 45 kcal/mole.

TL;DR: In this paper, the authors studied the structure of self-sustaining gaseous detonations in oxy-acetylene mixtures at initial pressures from 0·03 to 0·2 atm.

TL;DR: The limits of flammability of ethylene in oxygen, air and air-nitrogen mixtures were measured at elevated temperatures and pressures in a three litre spherical bomb as discussed by the authors.

TL;DR: In this article, a simple, highly idealized solid propellant for which collisions of a gas phase constituent with the surface may result in a surface gasification reaction is presented, which leads to reasonable agreement with currently available experimental data for both steady state and acoustic response properties of JPN propellant.

TL;DR: In this article, the drag coefficients and Reynolds numbers of single freely falling drops of pentane, heptane and benzene burning in cold atmospheres of varying oxygen concentration were calculated and compared with values expected for steady motion of non-evaporating spheres.

TL;DR: In this paper, the authors studied the quenching of premixed fuel-oxidizer flames by volatile additives; the change in quench diameter with inhibitor concentration was used to measure inhibitor effectiveness.

TL;DR: In this paper, an experimental and theoretical investigation has been carried out on the effects of air velocity and temperature, and stabilizer size and blockage, on the amount of fresh mixture entrained in the recirculation zone of a stabilized flame.

TL;DR: In this article, the isothermal kinetics and self-heating in binary mixtures of magnesium and sodium nitrate have been studied as a function of temperature and reactant composition.

TL;DR: In this article, the pre-flame and ignition behaviors of several closely related oxygen derivatives of hydrocarbons were investigated, and mechanisms were proposed to explain the observed differences in behaviour.

TL;DR: In this article, the decomposition of liquid hydrazines in the form of small spheres is reported and a theoretical decomposition model is proposed and examined, showing that the mass burning rate is proportional to the radius only for very low reaction rates or in the evaporative limit.

TL;DR: In this article, the authors evaluate the error in the values of overall reaction rates deduced from the characteristics of a stirred reactor which would result if it were assumed that the gases in the reactor were a homogeneous mixture reacting at the mean measured temperature of the reactor; this error has been expressed as a function of the flow rate, the composition of the input gases, the recirculation ratio and the activation energy of reaction.

TL;DR: In this paper, a vertical tube reactor flow technique has been used to examine two-stage ignition phenomena produced during the oxidation of acetaldehyde and propionaldehyde, and the effect of the addition of ethylene and of methyl chloride has been investigated.

TL;DR: In this article, the role of the ballistic modifier in the combustion of a nitrocellulose propellant is evaluated using the heat of explosion test, and it is shown that differences in heat-of-explosion caused by the modifier reflect differences in burning rate.

TL;DR: In this article, the products of the reaction between n-butane and nitrogen trifluoride were analyzed with a mass spectrometer and it was shown that no C F bonds are produced until there is more than enough flourine to react with hydrogen.

TL;DR: In this article, the roles of single and multi-stage ignition phenomena in both high and low temperature reaction mechanisms and their relations to the knock properties of engine fuels were investigated. But the results were limited to a single-stage reaction mechanism.

TL;DR: In this paper, a porous flat flame burner with heat extraction on hydrogen-oxygen and hydrogen-air flames was used to determine the temperatures of these flames experimentally and compared with those calculated from the thermodynamic data and the measured heat loss to the burner.

TL;DR: In this article, a new method is described, by which certain ballistic properties of solid propellants such as burning rate and pressure exponent can be obtained by using the closed impulse bomb, which consists of obtaining a pressure versus time trace by burning an end-burning grain in the closed bomb.