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

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.

Citation

Obeidat, A., Schnipper, T., M. Ingvorsen, K., Haider, S., Erik Meyer, K., Mayer, S. and H. Walther, J. (2014), "Large eddy simulations of the influence of piston position on the swirling flow in a model two-stroke diesel engine", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 24 No. 2, pp. 325-341. https://doi.org/10.1108/HFF-09-2011-0189