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Atomization and Sprays
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ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2017017143
pages 407-422

DYNAMICS OF THE EMULSIFIED FUEL DROP MICROEXPLOSION

Oleksandr G. Girin
Odesa National Maritime University, Mechnikova Str. 34, Odesa, 65029, Ukraine

ABSTRACT

Dynamics of the emulsified fuel explosive dispersal is investigated. Equations of a fuel shell radial motion prior to the fragmentation are derived and studied. It is shown that the shell is affected by huge inertia forces, caused by the acceleration of 109 m/sec2 order, when 1g of fuel is affected by the inertia force of 106 N/g. This allows formulating hypothesis regarding micro-explosion mechanism, which implies the fuel shell perforation by water vapor due to Rayleigh−Taylor instability. Verification is carried out via analysis of the necessary conditions of instability at both shell surfaces. Fuel shell dynamics is studied numerically being based on the derived differential equation of motion. It is concluded that the instability performance has high feasibility at external shell surface close to the moment of the utmost expansion. Shell bursting is then modeled being based on analogy of the shell dynamics and "claviform" mode of a drop breakup. Formulae for a number and sizes of secondary droplets left by the micro-explosion are obtained. They show that the micro-explosion increases the liquid fuel surface and evaporation rates by 2 orders. Acoustic field of the totality of the spray volume micro-explosions is strong enough to affect the rates of the component mixing and chemical reactions in a jet spray.


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