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International Journal of Energetic Materials and Chemical Propulsion

Publicou 6 edições por ano

ISSN Imprimir: 2150-766X

ISSN On-line: 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

AEROSOL EMISSION MEASUREMENTS OF ROCKET MOTORS FROM CONTAINED OPEN BURN EVENTS

Volume 5, Edição 1-6, 2002, pp. 81-87
DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.110
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RESUMO

Aerosol concentrations were measured and samples collected from contained burn tests carried out on two types of rocket motors, the NIKE M88 and the Improved HAWK. Each rocket motor contains 750 pounds of double base type propellant, and 605 pounds of composite type propellant, respectively. The tests were carried out in a sealed underground test chamber of approximate volume 4644 m3. Aerosol emissions were sampled using an aerosol instrument outside of the burn chamber, after each rocket motor burn, by drawing aerosol-laden gas through the barrier into two parallel sampling systems. One system (impactor) collects aerosol samples from 0.1 to 10 μm in aerodynamic diameter and measures their mass concentrations and size distributions (μg/m3) in real time. The other system (streaker) collects three size fractions, > 10 μm, 2.5−10 μm, and < 2.5 μm with the latter two size fractions collected on rotating substrates thereby providing a time resolved series of samples. The streaker samples are analyzed using Proton-Induced X-ray Emission (PIXE) Spectroscopy to determine the aerosol elemental composition for elements of atomic number greater then Sodium (Z=11). The aerosol emissions from the burn tests were compared with samples, analyzed by PIXE, of background materials (shotcrete, concrete, aggregate, and tuff) taken from the chamber prior to the tests. The background materials are dominated by Calcium, Aluminum, Silicon, Potassium, Titanium, Chromium, Manganese, and Iron. In contrast, the elemental concentrations in the aerosols from the NIKE test are dominated by Sb and Pb, that are used as moderators in the propellant. Cu, probably be from the linear shaped charges used to initiate the explosive, is also present in the test samples. Aerosols were mostly near 1 μm in size. For the HAWK test, the aerosol is dominated by Al, which occurs in the propellant as metallic Al and is converted to Al2O3 upon combustion. Aerosols were initially mostly larger than 1 μm shifting to a bimodal size distribution with submicron particles and coarse particles (> 2.5 μm) predominating at the expense of small super-micron sized particles. In both tests we see a complex behavior of the aerosol size distribution with time as competing tendencies of aerosol growth by coagulation and settling out of larger particles occur.

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