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- 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.
- Authors
Haider, S.; Schnipper, T.; Obeidat, A.; Meyer, K.; Okulov, V.; Mayer, S.; Walther, J.
- Abstract
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 stereoscopic particle image velocimetry technique. The measurements 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.
- Subjects
MARINE diesel motors -- Cylinders; TWO-stroke cycle engines; DIESEL motor cylinders; SPEED; VELOCIMETRY
- Publication
Journal of Marine Science & Technology, 2013, Vol 18, Issue 1, p133
- ISSN
0948-4280
- Publication type
Article
- DOI
10.1007/s00773-012-0192-z