Large eddy simulations of the influence of piston position on the swirling flow in a model two-stroke diesel engine. Issue 2 (25th February 2014)

• Record Type: Journal Article
• Authors: Obeidat, Anas; Schnipper, Teis; M. Ingvorsen, Kristian; Haider, Sajjad; Erik Meyer, Knud; Mayer, Stefan; H. Walther, Jens
• Is Part Of: International journal of numerical methods for heat & fluid flow. Volume 24:Issue 2(2014)
• Page Start: 325
• Page End: 341
• Publication Date: 2014-02-25
• Subjects: Large eddy simulation -- Diesel engine -- Particle image velocimetry -- Scavenging flow -- Swirling flow; Heat -- Transmission -- Mathematics -- Periodicals; Fluid dynamics -- Mathematics -- Periodicals; 536.2
• DOI: 10.1108/HFF-09-2011-0189
• Languages: English
• ISSNs: 0961-5539

Abstract

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.