Experimental characterisation of sprays resulting from impacts of liquid-containing projectiles

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Journal Title
Journal ISSN
Volume Title
School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
Major/Subject
Mcode
Degree programme
Language
en
Pages
388-402
Series
Nuclear Engineering and Design, Volume 295
Abstract
Modelling and analysing fires following aircraft impacts requires information about the behaviour of liquid fuel. In this study, we investigated sprays resulting from the impacts of water-filled metal projectiles on a hard wall. The weights of the projectiles were in the range of 38–110 kg, with 8.6–68 kg water, and the impact speeds varied between 96 and 169 m/s. The overall spray behaviour was observed with high-speed video cameras. Ultra-high-speed cameras were used in backlight configuration for measuring the droplet size and velocity distributions. The results indicate that the liquid leaves the impact position as a thin sheet of spray in a direction perpendicular to the projectile velocity. The initial spray speeds were 1.5–2.5 times the impact speed, and the Sauter mean diameters were in the 147–344 μm range. This data can be used as boundary conditions in CFD fire analyses, considering the two-phase fuel flow. The overall spray observations, including the spray deceleration rate, can be used for validating the model.
Description
Keywords
aircraft impact, spray, fuel, nuclear power
Other note
Citation
Hostikka, Simo & Silde, Ari & Sikanen, Topi & Vepsä, Ari & Paajanen, Antti & Honkanen, Markus. 2015. Experimental characterisation of sprays resulting from impacts of liquid-containing projectiles. Nuclear Engineering and Design. Volume 295. 388-402. ISSN 0029-5493 (printed). DOI: 10.1016/j.nucengdes.2015.09.008.