摘要:

The profile of temperature, reagents, main reaction products, hydrocarbons and polycyclic aromatic hydrocarbons have been determined at different heights along a vertical flow reactor on which cool, blue and yellow flames of a n-heptane/oxygen/nitrogen mixture were stabilized at atmospheric pressure

ISSN:0010-2202    

DOI:10.1080/00102207208952526

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

In this paper the preliminary results obtained by feeding boron trichloride in a nitrogen plasma jet downstream the anode are given.

ISSN:0010-2202    

DOI:10.1080/00102207208952527

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The paper reviews the state of the art of additives used in burner fuels primarily to control combustionrelated problems. These problems, specifically, are:(l) Smoke emission(2) High temperature corrosion due to metal impurities in fuels, and(3) Low temperature corrosion and acid laden smut due to sulphur in fuels.

ISSN:0010-2202    

DOI:10.1080/00102207208952528

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The luminous emissivity is caused by soot formed from partial combustion and so depends knowingly on the relative rates of the processes of heating and oxygen admixture with the fuel. To predict luminous radiation we therefore need to know the relation between emissivity and soot concentration and the rise and fall of soot concentration along the flame. A reasonable approximation for the emissivity is:

ISSN:0010-2202    

DOI:10.1080/00102207208952529

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A literature survey is presented on the effect of pressure on soot formation in flames For continuous flames the main effect is an increase in soot formed proportional to pnwhere 1 < n < 3. However the reverse is true for gaseous explosions, as the soot yield decreases with pressure, presumably because the combustion products have a greater chance to approach equilibrium. Diffusion flames show a low pressure limit below which soot does not occur, while for premixed flames the critical fuel/air ratio for soot formation is found to be essentially independent of pressure, although the proportion of tarry materials may vary.

ISSN:0010-2202    

DOI:10.1080/00102207208952530

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The Lorentz-Mie theory of the extinction and scattering of light by small spherical particles is applied to soot particles in flames. Extinction and scattering coefficients and angular scattering patterns are calculated, in the visible range, for different values of the complex refractive index of soot. Theoretical results for the emissivity and dispersion of the extinction coefficients are presented for monodisperse and polydisperse systems.

ISSN:0010-2202    

DOI:10.1080/00102207208952531

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

This paper describes the results of a systematic quantitative study of the combustion of single laser-ignited beryllium droplets burning in mixtures of oxygen/nitrogen. Nitrogen is shown here to raise the ignition limit and retard the combustion relative to oxygen/argon. Nitrogen-induced fragmentation of beryllium droplets is demonstrated for the first time. The results of these studies are compared with earlier quantitative data on beryllium droplets burning in oxygen/argon and it is shown that the rates, mechanisms and nature of the debris from burning are all affected by environmental species. The significant contribution of condensed phase processes occurring at the droplet surface to the overall combustion reveal clearly the inadequacy of a vapor phase combustion model for beryllium.

ISSN:0010-2202    

DOI:10.1080/00102207208952532

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The total burning time of boron carbide powder has been measured in premixed laminar boron carbide-propane-oxygen-nitrogen flames at atmospheric pressure. Burning times were several times longer than for elemental boron of the same particle size and were even longer than predicted by extrapolation from larger single-boron carbide particle burning experiments. Several possible explanations for this discrepancy are discussed.

ISSN:0010-2202    

DOI:10.1080/00102207208952533

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

An experimental investigation of stable laminar ethylene and propylene diffusion flames burning on a nozzle in weightlessness was performed at the NASA-Lewis 2.2 Second Drop Tower. For a range of low flow conditions, visual evidence indicated that the flames reaction zone was burning over a wide range of combustion rates; however, for the purposes of correlating flame length the stoichiometric burning rate appeared adequate. It was found that if Re is the ambient pure fuel Reynolds number based on nozzle radius, Sc is the ambient pure fuel Schmidt number, and c, is the mole fraction of fuel burning stoichiometrically in air, the ratio of flame length to nozzle radius was predicted and experimentally verified to be proportional to Sc1/2Re ln1/2(1/(1−c8)).

ISSN:0010-2202    

DOI:10.1080/00102207208952534

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A noninterfering diagnostic technique that employs monomeric hydrogen fluoride, HF, as a passive tracer gas has been developed. Infrared absorption by HF is used to infer turbulent mixing rates in inert and combusting flows. Data are presented on the turbulent diffusion of HF seeded streams of air, heated air, H2, and CO2into an outer coaxial air stream. Combustion of C2H2and air in a free jet configuration has also been investigated with the H F tracer. In most of these flow situations, the HF exhibited apparent rotational nonequilibrium. Development of the experimental technique and methods for data acquisition and analysis are discussed.

ISSN:0010-2202    

DOI:10.1080/00102207208952535

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor