Combustion of Miscible Binary-Fuel Droplets at High Pressure Under Microgravity
Titel:
Combustion of Miscible Binary-Fuel Droplets at High Pressure Under Microgravity
Auteur:
Mikami, M. Kono, M. Sato, J. Dietrich, D. L. Williams, F. A.
Verschenen in:
Combustion science and technology
Paginering:
Jaargang 90 (1993) nr. 1-4 pagina's 111-123
Jaar:
1993-04-01
Inhoud:
The objective of this research is to study near-critical and super-critical combustion of droplets consisting of binary fuel mixtures. Experimental results are reported on the burning of fiber-supported droplets of mixtures of n-heptane and n-hexadecane, initially about 1 mm in diameter, under free-fall microgravity conditions. The ambient pressures range up to 3.0 MPa, extending above the critical pressure of both fuels, in room-temperature nitrogen-oxygen atmospheres having oxygen mole fractions of 0.12 and 0.13. Three-stage burning of the binary fuel droplets is observed, and the onset lime of the second stage is compared with the predictions of an existing theory. Experimental evidence of thermo-capillary and/or diffuso-capillary convection during the droplet burning is obtained. The results contribute to improving understanding of binary-fuel droplet-combustion processes at high pressures.