摘要:

Abstrad–This paper deals with an effective method for the prediction of kinetic parameters of H-abstraction reactions from hydrocarbon species. The prediction of the reactivity of complex molecules is obtained starting from a large set of well defined experimental rate values for small radicals and molecules as a basis. making use of proper analogy rules and a limited number of reference kinetic parameters.

ISSN:0010-2202    

DOI:10.1080/00102209408935325

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–A one-dimensional model describing a self-sustaining reaction wave moving through a unidirectional periodic flow field is proposed and studied numerically. In the case of zero diffusivity of the deficient reactant the reaction wave undergoes partial extinction, as a result of which a considerable portion of the original premixture remains unconsumed. For long-wavelength fields within a certain range of the flow intensities the system exhibits a peculiar nonuniqueness of possible propagation regimes. The transition from one regime to another occurs in a manner of hysteresis.

ISSN:0010-2202    

DOI:10.1080/00102209408935326

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract– The results of a detailed study of the combustion of several binary silicon/oxidant pyrotechnic systems are reported in this and three immediately following papers. The overall aim of the study was to investigate the role of different oxidants in binary combination with silicon as the common fuel.

ISSN:0010-2202    

DOI:10.1080/00102209408935327

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–Studies of binary Si/oxidant pyrotechnic systems have been extended by examination of the temperature profiles of Si/Sb2O3and Si/KNO3compositions.

ISSN:0010-2202    

DOI:10.1080/00102209408935328

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–studies of tbe combustion of several binary silicon/oxidant pyrotechnic systems (Si/Fe2o3, Si/SnO2, Si/Sb2O3and Si/KNO3) have been extended to examine the behaviour of ternary systems with silicon as fuel and binary combinations of the above oxidants. The effects of substituting ferrosilicon, FeSi7, or calcium silicide, CaSi2, for some or all of the Si in the above systems have also been examined.

ISSN:0010-2202    

DOI:10.1080/00102209408935329

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–Kinetic parameters for the processes occurring during controlled heating and during combustion of the binary silicon-fuelled pyrotechnic systems. Si/Fe2O3, Si/SnO2. Si/Sb203 and SilKN03 have been estimated,where possible, from the results of both thermal analysis and temperature profile measurements. The values obtained from the two very different techniques are compared and discussed, and the role of the oxidant, in a series of binary combinations of silicon as the common fuel with different oxidants, is discussed in terms of the detailed results reported in this and the immediately preceding three papers.

ISSN:0010-2202    

DOI:10.1080/00102209408935330

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–Post-combustion of carbon black and diesel soot collected on particulate traps has been studied at a laboratory scale. The role of parameters such as entering gas temperature, catalytic formulations, additives has been investigated.

ISSN:0010-2202    

DOI:10.1080/00102209408935331

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Counter·intuitively, moist CO oxidation is experimentally shown to be inhibited by the addition of oxygen to stoichiometric mixtures at 1000 K and atmospheric pressure. At these conditions, oxygen essentially reduces the ratio of [H]/[OH] such that the consumption of HO2occurs through chain-terminating rather than chain propagating reactions, Although multiple sets of reactions are active in this transition, the principal effect results from a transition from HO2+ H - OH + OH to HO2+ OH - H2O+O2and H02+0-0H+02as oxygen concentration is increased, As temperature is increased these reactions have a lesser influence on the 0, Hand OH radical pool due to the reduced production of HO2, Near 1040 K, the inhibition effects cease to be observed and the reaction rate is essentially independent of oxygen concentration. At higher temperatures still, previous experiments have shown that oxygen addition increases the rate of CO consumption. These experimental trends are qualitatively predicted by a comprehensive mechanism for CO/H2/02oxidation developed previously. Quantitative predictions can be obtained by updating the rate of H02+ OH - H20 + 02to the values given by recently published reviews of low temperature data and to new high temperature experimental data.

ISSN:0010-2202    

DOI:10.1080/00102209408935332

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–The present study reports that radiation absorption in gas-phase and natural convection play significant roles in gas-phase ignition of porous solid fuels exposed to an external radiation heating. While gas-phase radiation absorption shortens ignition delay times, natural convection delays gas-phase ignition. A theoretical model for a transient one-dimensional analysis includes radiation absorption and scattering by the fibrous structure of the fuel, radiation absorption in gas-phase, natural convection, and internal convection due to the porous structure. Predicted ignition delay times are found to be in excellent agreement with experimental results. A parametric study shows that ignitions under unfavorable conditions to attain a thermal runaway are induced mainly by radiation absorption in gas-phase.

ISSN:0010-2202    

DOI:10.1080/00102209408935333

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Abstract–A new approach to modeling the mean effects of stretch on laminar flamelelS in a premixed turbulent flame is explored which uses statistical results of direct numerical simulation of the distributions of strain and curvature on a propagating surface. These statistics are combined to estimate the distribution of stretch rates experienced by the flame and hence the mean rate at which the turbulent flame converts reactants to products per unit of flame surface area. The results are presented as a function of the Karlovitz number ranging from zero to unity.

ISSN:0010-2202    

DOI:10.1080/00102209408935334

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor