摘要:

A detailed chemical kinetic mechanism describing the high temperature oxidation of C2HCI3 is presented. The mechanism involves the participation of 34 species in 73 reversible elementary reactions. The mechanism accounts for the experimental ignition delay times in shock tubes as well as species profiles for reactants, stable intermediates, and products in premixed flames.

ISSN:0010-2202    

DOI:10.1080/00102208608923906

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Previous investigations in this laboratory on the structure of diffusion flames formed over a liquid fuel surface with a parallel oxidizer flow have been completed with the identification of the soot field. To this purpose the standard laser light scattering-extinction technique used by a number of authors has been adopted. Measurements of fluorescence and UV absorption are also reported.

ISSN:0010-2202    

DOI:10.1080/00102208608923907

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Previous theories modelling unsteady one-dimensional flames are extended so that the effect of upstream and downstream noise interference is included. Using the fact that the Mach number M is a small number, the principles of matched asymptotic expansions are used to link long wavelength acoustic disturbances at large distances [0(\f~l) on a diffusion length scale] from an anchored flame to small perturbations in velocity within the combustion zone. This matching process yields a frequency condition governing the flame vibration and a number of cases are illustrated in the paper.

ISSN:0010-2202    

DOI:10.1080/00102208608923908

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The ignition process of liquid fuel droplets has been studied. A laboratory flame maintained by a vertical, monosized liquid fuel droplet array surrounded by a laminar flow of a mixture of helium and oxygen represents the system investigated. A system of partial differential equations describing the ignition of a single droplet was formulated. By specifying the droplet surface position with the rfa-law, the system of partial differential equations could be solved numerically. The effects of convection and interference between the droplets in the array were lumped in the evaporation rate constant in the rfMaw. The ignition model could interpret the experimental results on the ignition of droplet arrays of pure fuel, and by extension, of residual fuel oil.

ISSN:0010-2202    

DOI:10.1080/00102208608923909

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The distortion of a two-dimensional fuel strip that arises due to interaction with a vortex pair structure is examined analytically, with emphasis placed on the evolving flame structure and the consumption of reactants due to straining of the flame. Two different theoretical situations are considered: one in which the diffusion flames bounding an infinitely long fuel strip interact with a counter-rotating vortex pair, and another in which the corners of the flame bounding a semi-infinite fuel strip coincide with the vortex pair. The second case is particularly relevant as a 2D analog of the vortical flame structure formed at a circular orifice or nozzle.

ISSN:0010-2202    

DOI:10.1080/00102208608923910

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Three 1,fC-!abeled fuels were burned as premixed flames: (a) 72 percent methanol in toluene; (b) 62 percent acetone in toluene; (c) 54 percent cyclohexane in toluene. These compositions correspond to 1:1 cofuel carbon:toluene carbon ratios. Soot, sampled from the yellow flame zone and collected on a glass-fiber filter, was assayed for 1,(C-activity. Results were analysed in terms of R, the relative probability of toluene carbon xofuel carbon conversion. R values of 2 and 50 were determined for cyclohexane and methanol respectively. Studies were carried out at 4:1 Na:02 composition and fuel:oxygen equivalence ratios of 1.6, 1.8 and 2.0. Fuel:oxygen equivalence ratio had minor impact on relative fuel-to-soot conversion.

ISSN:0010-2202    

DOI:10.1080/00102208608923911

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Experimental burning times of particles were obtained for a sample of a Type A lignite, screened between 88 and 105 im, in a laboratory furnace with essentially cold walls at a constant gas temperature of U50±20 K. The mass fraction of oxygen in the furnace, X,, ranged from about 0.20, below which no combustion was observed, to 0.46. Over most of this range, the combustion of particles was essentially complete. The measured burning times were short (30 to 50 msec) and are shown to be inversely proportional to the gas phase mass transfer rates, suggesting diffusion-controlled kinetics. There is only a narrow range, 0.20 < Xg< 0.23, in which the burning times were clearly higher, indicating an intermediate regime. It was also observed that, in this narrow range, the particles tended to extinguish before complete combustion. Thus, it appears that, as X, was progressively decreased, there was unusually rapid transition from the diffusion-controlled regime to extinction at relatively high values of X". It is reasonable to ascribe this behavior to unusually high heat losses in these low-temperature experiments.

ISSN:0010-2202    

DOI:10.1080/00102208608923912

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor