Microgravity droplet combustion in high pressures near critical pressures of fuels

Conference · Mon Jan 01 04:00:00 EST 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6517291

Sato, Jun'ichi ^[1]; Tsue, Mitsuhiro; Niwa, Mario; Kono, Michikata ^[2]

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1. Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. Toyosu, Koto-Ku, Tokyo 135 (Japan)
2. Department of Aeronautics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo (Japan)

Burning behavior of a fuel droplet in a quiescent high-pressure atmosphere has been studied experimentally to explore the effects of the ambient pressure just around the critical pressure of fuel. Since the natural convection changes the transport field around the burning droplet, microgravity field made by a falling apparatus were used to suppress the natural convection generated by the droplet burning. Experiments showed that spherical flames were obtained for ambient pressures both below and above the critical pressure of fuel. As the ambient pressure is increased, the burning life time decreases and reaches the minimum at the critical pressure of fuel, beyond which the burning life time increase. Flame diameter increases during the burning time to a maximum and then decreases to burnout. This behavior is the same both below and above the critical pressure of the fuel. The maximum flame diameter attained during burning is a function of pressure and decreases with ambient pressure throughout the range investigated. There is no change in slope or minimum at the critical pressure.

• OSTI ID: 6517291
• Report Number(s): CONF-8809192--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 197:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
CHEMICAL REACTIONS
COMBUSTION
CRITICAL PRESSURE
DROPLETS
FUEL PARTICLES
HEPTANE
HYDROCARBONS
OCTANE
ORGANIC COMPOUNDS
OXIDATION
PARTICLES
PHYSICAL PROPERTIES
SPRAYS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES