Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SOLUTION FOR THE DROPLET COMBUSTION IN MICROGRAVITY
Submission Author:
Mariovane Donini , RS
Co-Authors:
Cesar Cristaldo, Fernando Filho Fachini
Presenter: Mariovane Donini
doi://10.26678/ABCM.ENCIT2016.CIT2016-0580
Abstract
In the present work, combustion of an isolated fuel droplet over a wide range of environment temperatures are examined numerically in order to analyse the effect of buoyancy force on the flame. Generally, fuel droplets in combustion devices are so small that the influence of buoyancy force on vaporization and combustion of droplets is negligible. On the other hand, fuel droplets in experimental devices are affected by the buoyancy force due to their diameters around or more than 1 mm. To reduce the buoyancy effects, expensive experimental studies are performed in microgravity environment (drop-tower or out of space). It is analyzed the influence of the buoyancy force by changing the ambient atmosphere temperature. It is positive in regions of hot gases and negative in regions of cold gases compared with the ambient atmosphere gas. The hot gases move upward and cold gases downward. Playing with the positive buoyancy force of hot gases around the flame and with the negative (cold) buoyancy force of cold gases around the droplet via ambient atmosphere temperature, it is possible to modified the flame shape. If the condition of spherical flame shape is verified, this method could be used to simulate droplet combustion in microgravity condition.
Keywords
droplet combustion, microgravity, Natural Convection, droplet combustion, microgravity, Natural Convection, droplet combustion, microgravity, Natural Convection, droplet combustion, microgravity, Natural Convection
