Experimental and Numerical Investigation of the Idle Operating Engine Condition for a GDI Engine Univ. of Modena and Reggio Emilia

Format:

Conference/Event

Author/Creator:

Malaguti, Malaguti, author.

Contributor:

Cantore, Giuseppe

Catapano, Francesco

D'Adamo, Alessandro

Sementa, Paolo

Vaglieco, Bianca Maria

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The increased limitations to both NOx and sootemissions have pushed engine researchers to rediscover gasolineengines. Among the many technologies and strategies, gasolinedirect injection plays a key-role for improving fuel economy andengine performance. The paper aims to investigate an extremelycomplex task such as the idle operating engine condition when theengine runs at very low engine speeds and low engine loads andduring the warm-up. Due to the low injection pressure and to thenull contribution of the turbocharger, the engine condition is farfrom the standard points of investigation. Taking into account thewarm-up engine condition, the analyses are performed with atemperature of the coolant of 50°C.The paper reports part of a combined numerical and experimentalsynergic activity aiming at the understanding of the physics ofspray/wall interaction within the combustion chamber and particularcare is used for air/fuel mixing and the combustion processanalyses. In order to properly describe the engine condition,different injection strategies are investigated. Late and earlyinjection strategies are deeply analyzed and compared in terms ofcombustion stability and pollutant emissions.UV-visible imaging and spectral measurements are carried out inreal engine with wide optical accesses... Measurements areperformed in the optically accessible combustion chamber realizedby modifying a real engine. The cylinder head was modified in orderto allow in the fourth cylinder the visualization of the fuelinjection and the combustion process with high spatial and temporalresolution.The 3D-CFD engine simulations are reproduced by means of thecommercial code Star-CD. Due to the warm-up condition and the manyphysical sub-models a numerical methodology is implemented andparticular care is used to boundaries conditions analyses. CFDanalysis is used to find a possible explanation of the highcycle-to-cycle variability. The experimental and numericalcomparisons, in terms fuel mixing and front flame propagation, givean explanation of the idle condition

Notes:

Vendor supplied data

Publisher Number:

2012-01-1144

Access Restriction:

Restricted for use by site license