Article (Scientific journals)
PIV study of the effect of piston position on the in-cylinder swirling flow during the scavenging process in large two-stroke marine diesel engines
Haider, Sajjad; Schnipper, T.; Obeidat, Anas et al.
2013In Journal of Marine Science and Technology, 18 (1), p. 133-143
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Keywords :
Swirl; Two-stroke engine; PIV; Scavenging
Abstract :
[en] A simplified model of a low speed large two- stroke marine diesel engine cylinder is developed. The effect of piston position on the in-cylinder swirling flow during the scavenging process is studied using the stereo- scopic particle image velocimetry technique. The mea- surements are conducted at different cross-sectional planes along the cylinder length and at piston positions covering the air intake port by 0, 25, 50 and 75 %. When the intake port is fully open, the tangential velocity profile is similar to a Burgers vortex, whereas the axial velocity has a wake- like profile. Due to internal wall friction, the swirl decays downstream, and the size of the vortex core increases. For increasing port closures, the tangential velocity profile changes from a Burgers vortex to a forced vortex, and the axial velocity changes correspondingly from a wake-like profile to a jet-like profile. For piston position with 75 % intake port closure, the jet-like axial velocity profile at a cross-sectional plane close to the intake port changes back to a wake-like profile at the adjacent downstream cross-sectional plane. This is characteristic of a vortex breakdown. The non-dimensional velocity profiles show no significant variation with the variation in Reynolds number.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Haider, Sajjad
Schnipper, T.
Obeidat, Anas  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Meyer, K.E.
Okulov, V. L.
Mayer, S.
Wlather, J.H.
External co-authors :
yes
Language :
English
Title :
PIV study of the effect of piston position on the in-cylinder swirling flow during the scavenging process in large two-stroke marine diesel engines
Publication date :
31 March 2013
Journal title :
Journal of Marine Science and Technology
ISSN :
1437-8213
Publisher :
Springer
Volume :
18
Issue :
1
Pages :
133-143
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Computational Sciences
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