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Reduced Gravity Combustion of Propanol Droplets in Oxygen-Inert Environments

Published on Nov 30, 2009in Combustion Science and Technology1.564
· DOI :10.1080/00102200903190851
J. B. Wei4
Estimated H-index: 4
(UC Davis: University of California, Davis),
Benjamin D. Shaw12
Estimated H-index: 12
(UC Davis: University of California, Davis)
Abstract
Reduced gravity combustion experiments were performed with individual fiber-supported propanol droplets that were initially about 1 mm in diameter. The environment was composed of an oxygen-inert mixture. Helium, argon, xenon, nitrogen, and carbon dioxide were used as inerts, the oxygen mole fraction was 0.21, and the pressure was 0.03, 0.1, or 0.3 MPa. Use of helium caused extinction at 0.03 MPa and 0.1 MPa, but extinction was not observed in other oxygen-inert experiments within the 2.2 s reduced-gravity time available. Burning rates and sooting behaviors varied appreciably with the inert gas and the ambient pressure. Flame standoff ratios were generally quasisteady, and experimental flame standoff ratio data are compared with simplified theoretical predictions.
  • References (17)
  • Citations (4)
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References17
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Spherically symmetric ethanol droplet combustion experiments were performed to investigate the influence of initial droplet diameter, ambient pressure and inert substitution on the burning and sooting behaviors of ethanol droplet flames. Experiments were performed using the 2.2 sec reduced-gravity droptower facilities at the NASA Glenn Research Center. Noting the importance of transport characteristics of heat and species and their attendant effects on flame temperature and residence time on the...
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#1Benjamin D. Shaw (UC Davis: University of California, Davis)H-Index: 12
#2J. B. Wei (UC Davis: University of California, Davis)H-Index: 4
Abstract Reduced gravity and normal gravity combustion experiments were performed with individual fiber-supported propanol droplets with initial diameters that were typically in the 1.2 to 1.3 mm range. The environment was composed of an air-inert mixture at 0.1 MPa and about 298 K, where helium, carbon dioxide and xenon were separately used as inerts. In the experiments, the amount of inert gas in the environment was progressively increased until droplets could no longer be ignited. Droplet ign...
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#2C.T. Avedisian (Cornell University)H-Index: 24
In this paper, we study the influence of inert concentration and initial droplet diameter on nonane (C9H20) droplet combustion in an environment that promotes spherical droplet flames. The oxygen concentration is fixed while the inert is varied between nitrogen and helium. A range of initial droplet diameters (Do) are examined in each ambient gas: 0.4 mm < Do < 0.8 mm; and an oxidizing ambiance consisting of 30% oxygen (fixed) and 70% inert (fixed), with the inert in turn composed of mixtures of...
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