摘要:

A model of ignition that culminates in self-sustained burning is presented. It assumes total ignition time to consist of the time for initiation of the adiabatic surface reaction plus the time to subsequently establish self-sustained (steady) burning. An approximate expression for the non-steady burning time is developed, and theories of the surface reaction time are available. It is demonstrated that under appropriate conditions either or both time terms may contribute to or control the total ignition time. The theory is illustrated for M2 propellant, and it is shown that the effects of pressure and igniter heat flux on the computed characteristics of ignition time and ignition energy are consistent with those obtained by Beyer and Fishman. It is also shown that the developed model agrees in form with the ignition energy expression determined experimentally by Jones, and explains the semi-empirical expression developed by Lewis and von Elbe to describe the minimum ignition energy of gases.

ISSN:0010-2202    

DOI:10.1080/00102207208952506

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A ethod for stabilizing diffusion flames of liquid fuels has been described. Results are presented for the thermal structure of such a flame (of ethyl alcohol) as determined by an interferometric study.

ISSN:0010-2202    

DOI:10.1080/00102207208952507

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

ISSN:0010-2202    

DOI:10.1080/00102207208952508

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A mathematical model developed for computer solution of heat transfer problems involving change of phase heat effects was applied to the prediction of transient temperature distributions and volatile product evolution rates in decomposing wood specimens. The required data input for the model was obtained directly from differential scanning calorimetric and thermal gravimetric measurements along with measured values of thermal conductivity

ISSN:0010-2202    

DOI:10.1080/00102207208952509

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A theoretical analysis of the gasdynamic structure of a counter-flow diffusion flame established in the forward stagnation region of a porous cylinder is made on the basis of the flame surface and the boundary layer approximations. The numerical calculation is performed to obtain the gasdynamic flame structure for the methane-air system and the obtained profiles of temperature, density and velocity are found to correlate satisfactory with those of experiment.

ISSN:0010-2202    

DOI:10.1080/00102207208952510

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A test program was performed with the objective of experimentally investigating the boron reaction characteristics in a ducted rocket by systematically varying the primary chamber conditions.

ISSN:0010-2202    

DOI:10.1080/00102207208952511

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

It is shown that by using Internal Reflectance Spectroscopy the infrared spectra of solid propellants can be obtained with the expenditure of a minimum effort in sample preparation. Applications of this technique as a quality control technique and a method of studying surface charring are discussed.

ISSN:0010-2202    

DOI:10.1080/00102207208952512

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The infrared spectra of the surfaces of ammonium perchlorate crystals while being heated up to 250°C have been obtained using Internal Reflectance Spectroscopy. The crystal transformation, from rhombic to cubic, is apparently observed.

ISSN:0010-2202    

DOI:10.1080/00102207208952513

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

In the design of reliable fire hazard ratings and effective fire detection/protection systems, a clear understanding of the interaction between the fire and fuel is greatly desirable. While the fuel supplies combustible vapors to the flames, the flames feed heat back to the fuel for more vapors to be generated. Assuming that (a) the temperature profiles in the interior of a wood-like solid heated externally are linear, (b) the solid pyrolyzes abruptly at a critical temperature, (c) the pyrolysis products are removed out of the solid instantaneously upon their release and (d) the thermal properties of char and wood depend only on the solid density but not on temperature, a simple energy balance is made to deduce the influence of surface heat flux, specimen thickness, pyrolysis endothermicity, internal convection and thermal properties (of the virgin solid and char) on the rate of mass loss of an infinite slab and a cylinder in a fire. The predictions are in good agreement with the available experimental data. Precise measurement of the surface heat flux condition and inclusion of the resistance to the vapor flow in the char is expected to bring the predictions even closer to the measurements.

ISSN:0010-2202    

DOI:10.1080/00102207208952514

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

NO formation around single droplets may be an important phenomenon with respect to total NO formation in the diesel engine. A model is presented to predict the NO formed by a fuel droplet burning above the critical pressure of the fuel. The model is applied to the diesel engine in an attempt to predict measured exhaust gas NO concentrations. The results indicate individual droplet burning is important for low fuel/air ratios.

ISSN:0010-2202    

DOI:10.1080/00102207208952515

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor