LES Calculations of a Four Cylinder Engine IFP Energies nouvelles

Format:

Conference/Event

Author/Creator:

Laget, Laget, author.

Contributor:

Angelberger, Christian

Habchi, Chawki

Martinez, Lionel

Reveille, Benjamin

Truffin, Karine

Conference Name:

SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

A full 3D Large Eddy Simulation (LES) of a four-stroke,four-cylinder engine, performed with the AVBP-LES code, ispresented in this paper.The drive for substantial CO₂ reductions in gasoline engines inthe light of the global energy crisis and environmental awarenesshas increased research into gasoline engines and increased fuelefficiencies. Precise prediction of aerodynamics, mixing,combustion and pollutant formation are required so that CFD mayactively contribute to the improvement/optimization of combustionchamber, intake/exhaust ducts and manifold shapes and volumes whichall contribute to the global performance and efficiency of anengine.One way to improve engine efficiency is to reduce thecycle-to-cycle variability, through an improved understanding oftheir sources and effects. The conventional RANS approach does notallow addressing non-cyclic phenomena as it aims to compute theaverage cycle. LES on the other hand is particularly well suited tostudy unsteady flow effects and grants access to the description ofcyclic variations. When considering multi-cylinder engines,cylinder-to-cylinder interactions are crucial issues. Consequently,the whole engine has to be represented for a fully realisticsimulation.The present study aims at illustrating the innovative usage ofLES to reproduce and understand unsteady flow interactions betweenthe cylinders of a four-cylinder gasoline engine. To achieve thispurpose, more than nine cycles of the full engine were computed.The computational domain covers the whole geometry, including fourcombustion chambers as well as the intake and exhaust ducts andmanifolds. Details on the methodology used - based on the AVBP LEScode - and on the results obtained are given. Cylinder-to-cylinderand cycle-to-cycle discrepancies are shown and Fourier analysis isused to understand the cylinder-to-cylinder influence

Notes:

Vendor supplied data

Publisher Number:

2011-01-0832

Access Restriction:

Restricted for use by site license