Reference : PIV study of the effect of piston position on the in-cylinder swirling flow during th...
Scientific journals : Article
Engineering, computing & technology : Multidisciplinary, general & others
Computational Sciences
http://hdl.handle.net/10993/29832
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
English
Haider, Sajjad []
Schnipper, T. []
Obeidat, Anas mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Meyer, K.E. []
Okulov, V. L. []
Mayer, S. []
Wlather, J.H. []
31-Mar-2013
Journal of Marine Science & Technology
Springer
18
1
133-143
Yes (verified by ORBilu)
International
0948-4280
1437-8213
[en] Swirl ; Two-stroke engine ; PIV ; Scavenging
[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.
http://hdl.handle.net/10993/29832
10.1007/s00773-012-0192-z
link.springer.com/article/10.1007/s00773-012-0192-z

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