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Atomization and Sprays

Publication de 12  numéros par an

ISSN Imprimer: 1044-5110

ISSN En ligne: 1936-2684

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: 1.2 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: 1.8 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: 0.3 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: 0.00095 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: 0.28 SJR: 0.341 SNIP: 0.536 CiteScore™:: 1.9 H-Index: 57

Indexed in

FLASHING BEHAVIOR OF ROCKET ENGINE PROPELLANTS

Volume 25, Numéro 10, 2015, pp. 837-856
DOI: 10.1615/AtomizSpr.2015010398
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RÉSUMÉ

This paper investigates the morphology of a flash-atomizing jet at conditions representative for rocket engine operations. Due to its relevance for the aerospace industry, both storable and cryogenic rocket engine propellants are considered, namely ethanol [as inert equivalent of monomethyl hydrazine (MMH)] and liquid oxygen (LOx). A comparison between the flashing behavior of these two fluids is conducted. Despite the differences in their physical properties, a close similarity in the spray characteristics is found in terms of spray shape, spreading angles, and evolution of the flashing regimes as a function of the initial superheat. Based on this similarity, the applicability of a novel, nucleation-based onset criterion (χ parameter) for the fully flashing regime is verified for cryogenic propellants, showing a satisfactory agreement. This result has important implications. First, it corroborates that jet disintegration at highly superheated conditions is mainly controlled by the kinetics of phase transitions (i.e., the nucleation rate). Second, it explains the differences in the degree of superheat (Rp) at onset of the fully flashing regime between ethanol and LOx sprays, respectively. The low operating temperatures in cryogenic systems result in a significant increase of the energy barrier to nucleation. Consequently, the inception of nucleate boiling can occur either at significantly higher Rp values (homogeneous process) or may be triggered by heterogeneous effects. The associated increase of the χ parameter at the onset provides a good indication of the transition to heterogeneous nucleate boiling.

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  20. Rees Andreas, Oschwald Michael, Experimental Investigation of Transient Injection Phenomena in Rocket Combusters at Vacuum with Cryogenic Flash Boiling, in Droplet Dynamics Under Extreme Ambient Conditions, 124, 2022. Crossref

  21. Gärtner Jan Wilhelm, Loureiro Daniel D., Kronenburg Andreas, Modelling and Simulation of Flash Evaporation of Cryogenic Liquids, in Droplet Dynamics Under Extreme Ambient Conditions, 124, 2022. Crossref

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