Large eddy simulations of the influence of piston position on the swirling flow in a model two-stroke diesel engine

Anas Hassan MohD Obeidat, Teis Schnipper, Kristian Mark Ingvorsen, Sajjad Haider, Knud Erik Meyer, Stefan Mayer, Jens Honore Walther

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Purpose – The purpose of this paper is to study the effect of piston position on the in-cylinder swirling flow in a simplified model of a large two-stroke marine diesel engine. Design/methodology/approach – Large eddy simulations with four different models for the turbulent flow are used: a one-equation model, a dynamic one-equation model, a localized dynamic one-equation model and a mixed-scale model. Simulations are carried out for two different geometries corresponding to 100 and 50 percent open scavenge ports. Findings – It is found that the mean tangential profile inside the cylinder changes qualitatively with port closure from a Lamb-Oseen vortex profile to a solid body rotation, while the axial velocity
changes from a wake-like profile to a jet-like profile. The numerical results are compared with particle image velocimetry measurements, and in general, the authors find a good agreement. Research limitations/implications – Considering the complexity of the real engine, the authors designed the engine model using the simplest configuration possible. The setup contains no moving parts, the combustion is neglected and the exhaust valve is discarded. Originality/value – Studying the flow in a simplified engine model, the setup allows studies of fundamental aspects of swirling flow in a uniform scavenged engine. Comparing the four turbulence models, the local dynamic one-equation model is found to give the best agreement with the experimental results.
Original languageEnglish
JournalInternational Journal of Numerical Methods for Heat and Fluid Flow
Volume24
Issue number2
Pages (from-to)325-341
ISSN0961-5539
DOIs
Publication statusPublished - 2014

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