摘要:

A technique for determining the energy release rate of unconfined vapor cloud explosions is outlined. The technique is based on the finite amplitude isentropic acoustics of a centered spherical wave and involves the reduction of data from three pressure gauges which are instrumenting the explosion. The method of characteristics is used to back calculate to an effective spherical piston which replaces the explosion to allow energy release rates at the explosion site to be calculated.

ISSN:0010-2202    

DOI:10.1080/00102207308952332

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A new criterion is proposed for predicting the length of gaseous turbulent diffusion flames at high Reynolds numbers. The flame tip is identified with the point on the axis of maximum fuel concentrations where the fuel has been diluted to the lean flammability limit. A direct test using data in the literature shows good agreement. Flame-length equations are derived using the new criterion, together with data from the literature on entrainment of air into flames, transverse concentration profiles in turbulent jets, and flammability limits. With no arbitrary constants, these equations are in reasonable agreement with data and published equations for a turbulent diffusion flame in still air. With presently available data, the new criterion appears to be useful for predicting flame shapes and lengths in flows for which cold-flow concentration data are available from model studies. New experiments on turbulent diffusion flames at high Reynolds numbers are required for a definitive assessment of the proposed concepts.

ISSN:0010-2202    

DOI:10.1080/00102207308952333

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Experiments have been performed to develop test methods for the purpose of assessing fabric ignition characteristics with respect to the fabric burn injury potential. Thermophysical fabric properties relevant to the description of the ignition process are presented. Fabric ignition or melting times have been measured and are presented in non-dimensional form for radiative heating of desiccated fabrics.

ISSN:0010-2202    

DOI:10.1080/00102207308952334

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Based on a previously proposed “sideways sandwich model”, L*instability of a heterogeneous propellant is investigated. It is shown that strictly speaking the stability limit for a heterogeneous propellant is the same as that of a homogeneous propellant whose properties are the space-average of those of the heterogeneous propellant. In addition it is found that under suitable conditions heterogeneity can falsify the stability limit and produce a stabilization effect. When the heterogeneity frequency of the propellant coincides with the characteristic frequency calculated from the homogeneous theory, the analysis predicts linearly growing L*oscillations at the homogeneous L*stability limit, with a consequent intensification of the instability. The theoretical predictions offer some explanations for dual-frequency phenomena in L*burners.

ISSN:0010-2202    

DOI:10.1080/00102207308952335

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor