Investigation of in-cylinder flow patterns in 4 valve S. I. engine by using single-frame particle tracking velocimetry

Citation
Cs. Lee et al., Investigation of in-cylinder flow patterns in 4 valve S. I. engine by using single-frame particle tracking velocimetry, KSME INT J, 15(1), 2001, pp. 108-116
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
KSME INTERNATIONAL JOURNAL
ISSN journal
1226-4865 → ACNP
Volume
15
Issue
1
Year of publication
2001
Pages
108 - 116
Database
ISI
SICI code
1226-4865(200101)15:1<108:IOIFPI>2.0.ZU;2-X
Abstract
The in-cylinder flow field of gasoline engine comprises unsteady compressib le turbulent flows caused by the intake port, combustion chamber geometry. Thus, the quantitative analysis of the in-cylinder flow characteristics pla ys an important role in the improvement of engine performances and the redu ction of exhaust emission. In order to obtain the quantitative analysis of the in-cylinder gas flows for a gasoline engine, the single-frame particle tracking velocimetry was developed, which is designed to measure 2-dimensio nal gas flow field. In this paper, influences of the swirl and tumble inten sifying valves on the in-cylinder flow characteristics under the various in take flow conditions were investigated by using this P-TV method. Based on the results of experiment, the generation process of swirl and tumble flow in a cylinder during intake stroke was clarified. Its effect on the tumble ratio at the end of compression stroke was also investigated.