摘要:

This work is aimed at experimentally exploring the effects of minor compositional variables upon the combustion behavior of composite solid propellants. More specifically, it is intended to determine the influence, if any, of ingredients that improve the mechanical properties upon the oscillatory combustion characteristics. Tests are carried out in the familiar Crawford bomb, a low-pressure L*burner, and a high-pressure T-burner. Two families of propellants are investigated; each family consists of two propellants with a minor compositional variation between them. In the family that shows a decreasing (steady state) pressure index (n) with increasing pressures, all of the combustion characteristics are found to be very similar although the mechanical properties are widely different. In the other family, which shows an increasing n with increasing pressures, unmistakable differences are found between the two propellants in the low-pressure L*instability behavior (along with the differences in the mechanical properties), while the other combustion characteristics are almost identical. The results are interpreted to be consistent with a theory that highlights the importance of condensed phase heat-transfer effects.

ISSN:0010-2202    

DOI:10.1080/00102207308946638

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The apparent discrepancies of nitric oxide formation rates in fuel-rich flames are reviewed in the light of recently published work. The Zeldovich mechanism alone appears to be insufficient to account for observed behaviour under conditions in which hydrocarbon species are present, and a mechanism involving such species seems plausible. Experimental results in support of this conclusion are presented in a form suitable for kinetic analysis.

ISSN:0010-2202    

DOI:10.1080/00102207308946639

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Qualitative observations of flame spreading over textiles indicate different governing mechanisms for cellulosic fabrics, for nylon fabrics, and for fuzzy cellulosic materials.

ISSN:0010-2202    

DOI:10.1080/00102207308946640

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The objectives of this paper are twofold. The first objective is to better define the theoretical burning rate augmentation of solid propellants in the acceleration by using the presented fundamental concept on the pitting of the combustion surface and the agglomeration of metal at the bottom of a pit, particularly the dependence upon the aluminum content and its distribution is investigated.

ISSN:0010-2202    

DOI:10.1080/00102207308946641

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The paper reports on the measurements of maximum exothermic power pulses attainable from a given chemical system. Experimental tests involved the use of a shock tube technique whereby the exothermic process of combustion was controlled by reflected shock, so that it occurred under virtually inviscid flow conditions, while the measurements were performed at a resolution commensurate with the actual rate of chemical reaction. Experimental observations were made by means of a novel method of laser shear interferometry—a cross-breed between holography and the conventional means for measuring refractive index fields, in that, on one hand, it was based on the exploitation of the phase coherence of the laser light beam, recording first a diffraction image of the wave fronts which, for the desired final result, had to be optically reconstructed, and, on the other, it yielded eventually either two-dimensional interferograms or schlieren photographs of the observed phenomena. Chemical systems treated in this manner comprised primarily of stoichiometric hydrogen-oxygen mixtures with 80 and 90 per cent argon, the experiments covered the full permissible range of initial thermodynamic conditions, with the scope being bounded on the lower side by the density limit resulting in illegibly small fringe shifts, and on the upper side by the onset of unstable detonation phenomena.

ISSN:0010-2202    

DOI:10.1080/00102207308946642

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

ISSN:0010-2202    

DOI:10.1080/00102207308946643

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor