Showing papers in "Combustion and Flame in 1968"

TL;DR: In this paper, a review of recent work on gas phase detonations is presented, focusing on the newer quantitative approach to the study of the detonation structure, in which concepts from the field of reactive gas dynamics are extensively applied to all phases of detonation research.

TL;DR: In this paper, the decomposition of ammonium perchlorate and copper chromite mixtures has been studied in the temperature range from 250°C to 325°C and the products of decomposition were identified and the yield of each was established.

TL;DR: In this paper, the effect of diluent flow on soot production in laminar ethylene diffusion flames has been studied by measurement of smoke points and of the rates at which soot leaves a smoking flame.

TL;DR: In this paper, the development of pressure, the emission spectrum and the nature of moderately stable products formed during the spontaneous ignition of stoichiometric mixtures of 2-methylpentane with air have been compared with those during the spark-induced ignition of similar mixtures.

TL;DR: In this paper, a scaling law for the conditions under which individual flames will merge, independent of the number of fires involved, and in which the height of the flames and the size and separation of the individual fuel beds scale geometrically.

TL;DR: In this article, the stability of hydrogen-air diffusion flames has been studied at ambient temperature and pressure, with hydrogen injector diameter and lip thickness as primary geometric variables, and regions of stable flame were found for large variations in hydrogen and air flow.

TL;DR: In this article, the effects of increasing additions of oxygen to the fuel have been investigated and the amounts of chloroform-soluble material, polycyclic aromatic hydrocarbons (PCAH), and carbonaceous residue in the dry soot recovered from ethylene-air and ethane-air diffusion flames respectively have been determined.

TL;DR: In this article, the authors studied the chemiluminescence accompanying the high-temperature oxidation of methane in a shock tube and found that the time behaviour and maximum intensity of the emission of OH, CH, C 2 and CO and of the absorption of OH were determined as functions of temperature and stoichiometry.

TL;DR: In this article, the effects of changes in the oxygen index (i.e., the mole fraction of oxygen in the mixture) of oxygen-nitrogen and oxygen-argon mixtures supplied to the flame have been investigated.

TL;DR: In this paper, electron concentrations produced by calcium, strontium and barium in atmospheric-pressure hydrogen-nitrogen oxygen flames have been measured by the microwave cavity resonance method, and enthalpy changes and equilibrium constants obtained as follows: Download : Download full-size image Discrepancies between Second Law and Third Law values of ΔH00 are interpreted as indicating kinetic limitations in the ionization reactions.

TL;DR: In this article, a new model for the combustion of composite solid propellants is developed, where the flame is represented as burning at the interfacial region between streams of fuel and oxidant which are generated by vaporization of each solid component.

TL;DR: In this paper, an experimental investigation has been made of a flame impinging at an angle of 20° on the hearth of a furnace, and measured velocity and temperature profiles in the flame were found to have the same reduced form as profiles obtained for a plane heated impinging jet, by Mathieu.

TL;DR: In this article, lower explosion limits in hydrogen-oxygen and deuterium-oxoxygen mixtures have been measured in the diffusion regime and rate constants for the reactions H+O2 →OH+O and D+O 2 →OD+O between 800° and 1 000°K.

TL;DR: In this article, the authors used an opposed jet burner to stabilize an annular turbulent premixed flames by means of an experimental relation between the turbulent burning velocity, the laminar burning velocity and the intensity of turbulence.

TL;DR: In this article, the effects of hydrogen bromide, hydrogen iodide and hydrogen chloride on the limits of flammability of hydrogen-air mixtures have been studied over a wide range of mixture composition and final flame temperature by varying the oxygen content of the air.

TL;DR: The Vector Polar Method (VPM) as discussed by the authors is a graphical technique for the solution of wave interaction problems that are concerned with overall results, rather than with the progress of the process.

TL;DR: In this paper, the influence of initial diameter on the combustion of single drops in the size range 150 to 2 000μ has been measured and the results indicate that the burning rate of drops in sprays will be about 25 per cent less than the values predicted from studies of large single drops.

TL;DR: In this article, a series of experiments have been carried out on the burning of arrangements of wooden dowel in atmospheres of reduced oxygen concentration, and the effect of reducing the oxygen concentration is more marked when the process of flame spread depends on radiant heat transfer than when it depends on convective heat transfer.

TL;DR: In this article, a model for the burning of polymers in a candle-like manner in a slowly rising gaseous atmosphere and the limiting ratio of oxygen to inert gas in the atmosphere required to sustain steady burning has been determined.

TL;DR: In this article, a statistical review of all the current data available on the homogeneous oxidation of ammonia indicates that the activation energy is more precisely 37·7 ± 2·6 kcal mole−1.

TL;DR: Ortho-xylene has been shown to possess a much greater degree of reactivity towards oxygen than its isomers meta- and para xylene as mentioned in this paper, and it exhibited a maximum reaction rate of the order of ten times that observed for the less reactive isomers.

TL;DR: In this paper, it was shown that the combustion of simple ketones occurs mainly by propagation reactions which fall into three categories: the radical RCOCHR' formed by removal of a hydrogen atom from the ketone first adds on oxygen, then at least three different reactions take place:

TL;DR: The maximum total energy of the augmented flame at a boost ratio of unity was 15 kW and the heat transfer coefficients were correlated by the general relation ( Nu ) = 0·615 (Re) 0.466 indicating that the Lewis number could be taken as unity as mentioned in this paper.

TL;DR: In this paper, the line reversal technique of temperature measurement is shown to be in error if used with certain common flame conditions, and methods of correction outlined for flames with cool boundary layers, and for flames containing solid particles.

TL;DR: In this article, an experimental study of the combustion of ammonium perchlorate spheres and square cross-section rods in a combustible medium was carried out to pressure levels as high as 80 atmospheres.

TL;DR: In this paper, the autocatalytic nature of the reaction is attributed to the formation of formaldehyde, which behaves as a degenerate branching intermediate, and a mechanism is presented which satisfactorily explains the observed combustion characteristics of meta- and para-xylene.

TL;DR: In this article, the authors delineated important heat transfer mechanisms and determined the dependence of heat transfer on fuel vapour properties, and showed that fuel consumption rates, for the diameter range of interest, are determined primarily by nonradiative rather than radiative heat transfer.

TL;DR: The effects of additives, inert or otherwise, on the burning velocity of a propane-air mixture have been studied experimentally, by a schlieren technique, with flames stabilized on a tube burner.