B105 INFLUENCE OF LIGHT OIL ON DROPLET COMBUSTION OF HEAVY OIL : TRACING THE COMBUSTION PROCESS UNDER MICROGRAVITY(Droplet/particle combustion-1)

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概要

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• The droplet combustion of heavy oil and oil mixtures blending light oil (LO) and heavy oil residue (HOR) was traced under microgravity (10-s duration) by measuring the droplet size and temperature histories. The droplet temperature was measured using a thermocouple that was inlaid in the droplet and was made of platinum (Pt) and platinum-rhodium (Pt-Rh, 13 wt.% Rh) wires with diameters of 0.1 and 0.025 mm, respectively. VCR cameras were adopted to measure the droplet size and to observe the general combustion characteristics. For heavy oil of C glass and blended oils of LO and HOR, the whole process from ignition to extinction was identified to consist of four distinctive stages, in succession, the start-up, inner evaporation, thermal decomposition (pyrolysis) and polymerization stages. While the latter three stages are featured by obvious droplet swelling and bursting caused by the fuel evaporation and decomposition inside the droplet, the start-up stage denotes the initial transient procedure burning the LO components on the droplet surface and raising the droplet temperature rapidly. A level-off point was identified for the inner evaporation stage in the droplet temperature history, while either a level-off or inflection point was also verified for the decomposition and polymerization stages. As a consequence, three characteristic droplet temperatures were further distinguished, which were termed the evaporation-dominated, decomposition-induced and polymerization-triggering temperatures, respectively. It was found that the evaporation-dominated temperature gradually decreases with increasing the LO fraction in the oil while the other two temperatures little depend on the oil composition.

• 一般社団法人日本機械学会の論文
• 2000-10-01

著者

• Dietrich D.

  Nasa John H. Glenn Research Center

• Ikegami M.

  Hokkaido National Industrial Resaerch Institute

• Ikeda K.

  Hokkaido National Industrial Resaerch Institute

• Honma S.

  Hokkaido National Industrial Resaerch Institute

• Xu G.

  Hokkaido National Industrial Resaerch Institute

• Takeshita Y.

  Japan Space Utilization Promotion Center

関連論文

• B105 INFLUENCE OF LIGHT OIL ON DROPLET COMBUSTION OF HEAVY OIL : TRACING THE COMBUSTION PROCESS UNDER MICROGRAVITY(Droplet/particle combustion-1)

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