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An Investigation of Different Ported Fuel Injection Strategies and Thermal Stratification in HCCI Engines Using Chemiluminescence Imaging
Technical Paper
2010-01-0163
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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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.Also In
References
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