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

2010-01-0163

04/12/2010

Event
SAE 2010 World Congress & Exhibition
Authors Abstract
Content
The purpose of this study was to gain a better understanding of the effects of port fuel injection strategies and thermal stratification on the HCCI combustion processes. Experiments were conducted in a single-cylinder HCCI engine modified with windows in the combustion chamber for optical access. Two-dimensional images of the chemiluminescence were captured using an intensified CCD camera in order to understand the spatial distribution of the combustion. 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 the different port fuel injection strategies result in different charge distributions in the combustion chamber, and thus affect the auto-ignition timing, chemiluminescence intensity, and combustion processes. Under higher intake temperature conditions, the injection strategies have less effect on the combustion processes due to improved mixing. The intake temperature is a more important factor affect in a mixture and combustion process. Fuel injection duration the intake stroke and the intake valve opening phase (-300 °ATDC) results in a more homogeneous charge mixture, which is beneficial to combustion and fuel economy. With changing coolant temperature and intake temperature, the in-cylinder temperature distribution will be altered leading to different combustion processes. Enhanced thermal stratification has the potential for smoothing pressure-rise rates. At low loads, increased thermal stratification is worse because more quenching maybe occur at the cooler regions in the cylinder. Therefore, less thermal stratification and higher in-cylinder temperature are better for low load operation.
Meta TagsDetails
DOI
https://doi.org/10.4271/2010-01-0163
Pages
14
Citation
Liu, H., Yao, M., Zheng, Z., and Wang, Y., "An Investigation of Different Ported Fuel Injection Strategies and Thermal Stratification in HCCI Engines Using Chemiluminescence Imaging," SAE Technical Paper 2010-01-0163, 2010, https://doi.org/10.4271/2010-01-0163.
Additional Details
Publisher
Published
Apr 12, 2010
Product Code
2010-01-0163
Content Type
Technical Paper
Language
English