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International Journal of Energetic Materials and Chemical Propulsion

Erscheint 6 Ausgaben pro Jahr

ISSN Druckformat: 2150-766X

ISSN Online: 2150-7678

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.7 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00016 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.18 SJR: 0.313 SNIP: 0.6 CiteScore™:: 1.6 H-Index: 16

Indexed in

EFFECTS OF FLUORINE-CONTAINING SPECIES ON THE IGNITION AND COMBUSTION OF BORON PARTICLES: EXPERIMENT AND THEORY

Volumen 5, Ausgabe 1-6, 2002, pp. 453-463
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.480
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ABSTRAKT

The ignition and combustion of isolated boron particles in fluorine-containing environments were investigated both experimentally and theoretically. Boron particles (l-μm amorphous and 3-μm crystalline) were ignited and burned completely in the post-flame region of a multi-diffusion flat-flame burner, which provided a uniform zone of combustion products of CH4/NF3/O2 mixtures. In fluorinated environments, no clear distinction was observed to define a two-stage combustion process, a characteristic feature of boron oxidation without fluorine. At 1,780 K, boron ignition required a higher oxidizer concentration in non-fluorinated environments than in fluorinated environments. HF was found to increase the total burning times (tb) of boron particles; whereas F significantly reduced tb. A theoretical model was developed for simulating the combustion of an isolated boron particle in fluorine-containing environments. The oxide layer removal process was modeled using a reaction mechanism, which considers vaporization process of B2O3/(BO)n mixture and four global surface reactions of oxide layer with O2, H2O, F, and HF. The major products during the oxide removal process were found to be OBF, FBOH, HBO2, and BO2. The "clean" boron combustion model includes four global surface reactions of O2, H2O, F, and HF with boron. BF3, OBF, HBO2, and B2O2 are the major products during the "clean" boron combustion stage. Predicted tb are in good agreement with the measured data in the current study and other published experimental data in the literature. The calculated results show that both oxide layer removal and "clean" boron burning rates increase significantly in the presence of atomic fluorine.

REFERENZIERT VON
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