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Proceedings Paper

Correlation between cycle-resolved 2D velocity measurements and early combustion in a spark ignition engine
Author(s): Bengt Johansson
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Paper Abstract

The objective of this paper is to investigate how the low and high frequency parts of the flow at different locations close to the spark plug influence the early combustion at individual cycles in a SI-engine. 2-components cycle-resolved laser doppler velocimetry (LDV) measurements have been done both inside the spark gap, and around the spark tip to extract velocity information. The pressure in the cylinder was measured with a piezo-electric transducer connected to an A/D-card in a standard PC. The velocity information was filtered to get 'mean velocity' and 'turbulence'. The pressure signal was used in an one-zone heat-release model to get different levels of mass fraction burned etc. The results show a significant correlation between the velocity and the early combustion when the velocity was measured close to the spark plug tip. The correlation decreased when the velocity was measured at some distance from the electrodes for both a pancake and a high squish combustion chamber. The correlation between the velocity close to the spark plug and the early flame development showed no dependence on the air-fuel ratio.

Paper Details

Date Published: 6 August 1993
PDF: 8 pages
Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); doi: 10.1117/12.150567
Show Author Affiliations
Bengt Johansson, Lund Univ. (Sweden)

Published in SPIE Proceedings Vol. 2052:
Fifth International Conference on Laser Anemometry: Advances and Applications
J. M. Bessem; R. Booij; H. W. H. E. Godefroy; P. J. de Groot; K. Krishna Prasad; F. F. M. de Mul; E. J. Nijhof, Editor(s)

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