An Investigation of Different Ported Fuel Injection Strategies and Thermal Stratification in HCCI Engines Using Chemiluminescence Imaging Tianjin Univ

Format:

Conference/Event

Author/Creator:

Liu, Liu, author.

Contributor:

Wang, Yifeng

Yao, Mingfa

Zheng, Zunqing

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The purpose of this study was to gain a better understanding ofthe effects of port fuel injection strategies and thermalstratification on the HCCI combustion processes. Experiments wereconducted in a single-cylinder HCCI engine modified with windows inthe combustion chamber for optical access. Two-dimensional imagesof the chemiluminescence were captured using an intensified CCDcamera in order to understand the spatial distribution of thecombustion. N-heptane was used as the test fuel.The experimental data consisting of the in-cylinder pressure,heat release rate, chemiluminescence images all indicate that thedifferent port fuel injection strategies result in different chargedistributions in the combustion chamber, and thus affect theauto-ignition timing, chemiluminescence intensity, and combustionprocesses. Under higher intake temperature conditions, theinjection strategies have less effect on the combustion processesdue to improved mixing. The intake temperature is a more importantfactor affect in a mixture and combustion process. Fuel injectionduration the intake stroke and the intake valve opening phase (-300°ATDC) results in a more homogeneous charge mixture, which isbeneficial to combustion and fuel economy. With changing coolanttemperature and intake temperature, the in-cylinder temperaturedistribution will be altered leading to different combustionprocesses. Enhanced thermal stratification has the potential forsmoothing pressure-rise rates. At low loads, increased thermalstratification is worse because more quenching maybe occur at thecooler regions in the cylinder. Therefore, less thermalstratification and higher in-cylinder temperature are better forlow load operation

Notes:

Vendor supplied data

Publisher Number:

2010-01-0163

Access Restriction:

Restricted for use by site license