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Combustion of liquid-fuel droplets in supercritical conditionsA comprehensive analysis of liquid-fuel droplet combustion in both subcritical and supercritical environments has been conducted. The formulation is based on the complete conservation equations for both gas and liquid phases, and accommodates variable thermophysical properties, finite-rate chemical kinetics, and a full treatment of liquid-vapor phase equilibrium at the drop surface. The governing equations and associated interfacial boundary conditions are solved numerically using a fully coupled, implicit scheme with the dual time-stepping integration technique. The model is capable of treating the entire droplet history, including the transition from the subcritical to supercritical state. As a specific example, the combustion of n-pentane fuel droplets in air is studied for pressures in the range of 5-140 atm. Results indicate that the ambient gas pressure exerts significant control of droplet gasification and burning processes through its influence on fluid transport, gas-liquid interfacial thermodynamics, and chemical reactions. The droplet gasification rate increases progressively with pressure. However, the data for the overall burnout time exhibit a considerable change in the combustion mechanism at the critical pressure, mainly as a result of reduced mass diffusivity and latent heat of vaporization with increased pressure.
Document ID
19920061154
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shuen, J. S.
(NASA Lewis Research Center; Sverdrup Technology, Inc. Cleveland, OH, United States)
Yang, Vigor
(NASA Lewis Research Center Cleveland, OH, United States)
Hsaio, C. C.
(Pennsylvania State University University Park, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Combustion and Flame
Volume: 89
Issue: 3-4,
ISSN: 0010-2180
Subject Category
Inorganic And Physical Chemistry
Accession Number
92A43778
Distribution Limits
Public
Copyright
Other

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