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Proceedings Paper

Soot formation rate in premixed combustion at high pressures
Author(s): Myung-Whan Bae; Takeyuki Kamimoto
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Paper Abstract

The soot formation rate at high pressures has been studied with a premixed propane-oxygen-inert gas combustion in a specially designed disk-type constant-volume combustion chamber. Premixtures are simultaneously ignited by eight spark plugs located on the circumference of chamber at 45 degree intervals in order to observe the soot formation rate under high pressure. The eight flames being converged compress the end gases to a high pressure. The laser schlieren and direct flame photographs for observation field with 10 mm in diameter are taken to investigate the effects of curvature for the optical path in the flame front and gas flow in the measured position on soot formation rate. The soot formation rate in the chamber center during the final stage of combustion at the highest pressure is measured by the in situ laser extinction technique at the following conditions; 0.4 to 5.0 MPa for pressure, 1600 to 1900 K for temperature and 2.0 to 2.2 for equivalence ratio. The burnt gas temperature is measured by the two-color pyrometry method. The pressure and temperature during soot formation are changed by varying the initial charge pressure and the volume fraction of inert gas in the premixture, respectively. In the present study, it is found that the soot formation rate can be expressed by an empirical pseudo- first-order kinetics for surface growth even at high pressures, and that the rate constant of soot formation is only dependent of the temperature.

Paper Details

Date Published: 30 May 1995
PDF: 9 pages
Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); doi: 10.1117/12.209633
Show Author Affiliations
Myung-Whan Bae, Korea Institute of Technology and Education (South Korea)
Takeyuki Kamimoto, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 2513:
21st International Congress on: High-Speed Photography and Photonics
Ung Kim; Joon-Sung Chang; Seung-Han Park, Editor(s)

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