Abstract This paper is devoted to the burning of an isolated n-heptane droplet in microgravity and analysis of the experimental data presented by FLEX experiment. Developing the classical analytical research methodology, proposed by Forman A. Williams, and using our obtained analytical solutions for the problem of droplet equilibrium evaporation and combustion, the analytical solutions to solve the problem of two regimes of droplet burning were found. To explain the presence of the radiative flame extinction and further droplet burning in cool flame regime, we assumed that two flame surfaces exist, but the first flame surface can be fixed with observation devices, and the second flame surface is an invisible one. According to this hypothesis, we suggested the analytical formulas for droplet and flame histories. The analytical solutions demonstrate a good coincidence with the experimental and numerical results.
Highlights The analytical solutions of an isolated n-heptane droplet combustion are presented. The analytical solutions are compared with experimental data presented by FLEX. The analytical solutions show that two flame surfaces exist. The first flame surface can be fixed, and the second flame surface is invisible.
Two regimes of a single n-heptane droplet combustion
Acta Astronautica ; 163 ; 25-32
2019-01-29
8 pages
Article (Journal)
Electronic Resource
English
Microgravity n-Heptane Droplet Combustion in Oxygen-Hellum Mixtures at Atmospheric Pressure
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