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Proceedings Paper

Analysis of combustion flame in a DI diesel engine
Author(s): Hiroshi Nakajima; Tadakazu Shiozaki; Akira Miyashita; Hitoshi Suzuki
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Paper Abstract

Diesel engines are useful for commercial vehicles because of low fuel consumption and CO2 emissions that cause the greenhouse effect. However, it is necessary for environmental conservation to develop clean combustion. For thirty years, the combustion phenomena of diesel engines using combustion chamber visualization techniques have been widely studied by many researchers. Since in-cylinder flame temperature affects directly on NOx characteristics in engines, this phenomena has been studied in detail in multi-cylinder diesel engines using a new method to measure the in-cylinder temperature distribution by a two color method. Typical two color methods for two dimensional temperature distribution have used negative color films as recording media. So it took several days to analyze the flame temperature. However since the new system consists of a CCD camera and computer, the analyzing time is reduced to about 10 minutes. Parametric studies on injection timings, engine loads, intake valve layouts, and EGR rates using multi-cylinder commercial engines were carried out to investigate the effect of the flame temperature on NOx concentration. Each parameter study showed that the maximum temperature which occurred in a local stoichiometric combustion area of flame is correlative with NOx emissions rather than mean temperature.

Paper Details

Date Published: 12 December 1997
PDF: 11 pages
Proc. SPIE 3173, Ultrahigh- and High-Speed Photography and Image-based Motion Measurement, (12 December 1997); doi: 10.1117/12.294554
Show Author Affiliations
Hiroshi Nakajima, Hino Motors, Ltd. (Japan)
Tadakazu Shiozaki, Hino Motors, Ltd. (Japan)
Akira Miyashita, Hino Motors, Ltd. (Japan)
Hitoshi Suzuki, Hamamatsu Photonics KK (Japan)

Published in SPIE Proceedings Vol. 3173:
Ultrahigh- and High-Speed Photography and Image-based Motion Measurement
C. Bruce Johnson; Andrew Davidhazy; James S. Walton; Takeharu Goji Etoh; C. Bruce Johnson; Donald R. Snyder; James S. Walton, Editor(s)

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