Showing papers in "Combustion and Flame in 1965"

TL;DR: In this paper, an important requirement of any mechanism for low temperature oxidation of alkanes at 300° to 400°C is shown to be inclusion of processes for the conversion of HO2 to OH radicals.

TL;DR: In this paper, a simple acoustic theory for the development of spontaneous transverse waves in detonations is presented, where the authors show that any high frequency sound source located in the reaction zone of a detonation will yield an acoustic ray which asymptotically approaches a plane parallel to the shock and then travels parallel to it for long distances.

TL;DR: In this article, the authors compared the approximate theories for the critical conditions for a thermally explosive spherical hot spot with each other and with numerical solutions obtained by Merzhanov et al. They showed that the initial adiabatic self-heating of the center of the hot spot is an important feature of its behaviour and Zinn's simple treatment allows for this and gives no worse a result for the spherical hot spots than some of the more elaborate approximate models.

TL;DR: In this paper, the yields of carbon black obtained from a variety of aromatic hydrocarbons are compared under the condition of equimolar flow rates, and it is believed that the range in the yields obtained enables deductions to be made regarding the primary chemical processes involved in carbon formation.

TL;DR: In this paper, the authors used a mass spectrometer and a refined micro-collection and analysis procedure to develop profiles for sulphur monoxide, sulphur dioxide and sulphur trioxide formation.

TL;DR: In this article, the visible and u.v. radiation from flat flames burning premixed carbon monoxide-air and methane-air at various mixture ratios was examined over a range of burning velocities.

TL;DR: In this article, an analysis of the behavior of excess radical concentrations, H, OH and O as a function of height above the reaction zone in premixed acetylene-air flames at 2 −200° to 2400°K and 1 atmosphere pressure was given.

TL;DR: In this paper, a detailed study of the variation of the formaldehyde concentration was carried out and it was confirmed that this intermediate is the intermediate mainly responsible for degenerate branching and that the maximum formaldehyde concentrations are proportional to fuel and oxygen pressures under the conditions studied.

TL;DR: In this paper, the combustion of cyclohexane-oxygen mixtures between 230° and 350°C has been studied using a static system and different reaction vessel surfaces.

TL;DR: The pre-flame and ignition behaviours of a number of straight-chain, branched-chain and unsaturated aldehydes have been studied under identical conditions.

TL;DR: In this article, the authors provide an evaluation of the spherical constant volume vessel method with particular reference to its use over the full range of the combustion process and derive basic equations, as well as a variety of corroborative relations applicable throughout the process.

TL;DR: In this article, the authors used gas chromatographic analysis of cyclohexane and showed that the later part of the induction period is characterized by the fact that the concentration of the products and the temperature increase rise according to e t with approximately the same net branching factor.

TL;DR: In the preflame reactions of dilute mixtures of n -heptane and oxygen in argon at temperatures just above 1 000°K, the predominant feature is cracking as discussed by the authors.

TL;DR: In this paper, the combustion of n -heptane and propane mixtures between 200° and 350°C was studied using a static system and different reaction vessel surfaces, the oxidation being followed by measuring pressure and temperature changes and by analysis.

TL;DR: In this article, the effect of chromic oxide and n-type titanium dioxide on the initiation of the explosion of ammonium perchlorate has been studied and the critical temperature for the explosion has been determined, in the presence of both substances, as well as the activation energy of the process which leads to the explosion.

TL;DR: In this paper, a systematic investigation of the extinction of flames by fine powders propagating in a tube, carried out on various propagation regimes ranging from uniform, flames to detonations, has shown that each flame is best inhibited by a substance of optimum particle diameter, variable with the flame parameters.

TL;DR: In this paper, the effect upon flame speed of variation in mixture composition over the whole range of flammability was investigated, and the contours of equal flame speed, if displayed on a triangular diagram, reflected the form of the limits.

TL;DR: In this paper, it was shown that what previously has been believed to be the onset of retonation is also the beginning of detonation, based on the use of two completely independent techniques.

TL;DR: In this paper, a subsonic front, originating near the region where the confined burning occurs, proceeds through the explosive at a constant velocity which is unaffected by passage through the inert plug.

TL;DR: In this article, the preflame and ignition characteristics of aromatic hydrocarbons have provided interesting relationships between molecular structure and combustion properties and Mechanisms responsible for the relationships have been proposed.

TL;DR: In this paper, the slow combustion of toluene has been investigated over the range 450° to 515°C, and the reaction appears to be autocatalytic and the induction period may be climinated by the addition of a few millimetres of formaldehyde; the lifetime of the degenerate branching intermediate is 5·5 min at 490°C.

TL;DR: In this article, a comparison of the combustion of diethyl ether, pentane and acetaldehyde has been carried out over all the oxidation stages that lead to ignition, showing that the relative reactivities of the reaction products are different from those reported by previous workers.

TL;DR: In this paper, an analysis of peroxide and carbonyl intermediates in the combustion of five isomeric hexanes at all pre-flame stages below the minimum ignition point and also at higher temperatures up to 800°C.

TL;DR: The lead compounds formed during the combustion in glass apparatus of hydrocarbons containing tetraethyl lead (TEL) are mainly orthorhombic and tetragonal polymorphs of lead monoxide.

TL;DR: In this article, it was shown that the length of a planar laminar jet diffusion flame can be divided into two parts: L∗=li∗+ls∗, where li∗ is the length length of the part of the flame in the initial region immediately downstream of the burner exit where the boundary layer similar solutions are not applicable, and ls∗ are the lengths of the parts of the flames in the far downstream region where the same solution is applicable.