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.
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Acknowledgments
The authors acknowledge support from MAN Diesel & Turbo, the Danish Centre for Maritime Technology (DCMT), and the Danish Research Council of Independent Research (Grant 09-070608).The authors furthermore acknowledge CIMAC for granting permission to publish some of the results presented by the authors at the CIMAC 2010 Congress.
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Haider, S., Schnipper, T., Obeidat, A. et al. 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. J Mar Sci Technol 18, 133–143 (2013). https://doi.org/10.1007/s00773-012-0192-z
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DOI: https://doi.org/10.1007/s00773-012-0192-z