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Diesel Knock Visualization and Frequency Analysis of Premixed Charge Compression Ignition Combustion with a Narrow Injection Angle
Technical Paper
2013-01-0906
ISSN: 0148-7191, e-ISSN: 2688-3627
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Language:
English
Abstract
In this study, premixed charge compression ignition (PCCI)
combustion was implemented using an injector that had a narrow
injection angle of 70° and a moderately early injection timing of
-40° crank angle after top dead center (CA ATDC). In-cylinder
pressure measurements and high-speed direct imaging of the flame
were performed in an optically accessible single-cylinder diesel
engine. Frequency analysis of the acquired in-cylinder pressure
data was carried out to obtain the frequency range of diesel knock.
Meanwhile, image segmentation and a tracking algorithm based on
YCbCr color space were implemented to determine the frequency range
of diesel knock from the obtained high-speed image.
The results show that the frequency of diesel knock was
dominated by the range from 13 kHz to 15 kHz. Still, frequency with
low power existed down until 7 kHz. The frequencies of the area
movement were shown to be 13 kHz and, in some cases, 8.67 kHz. It
was found that there is a direct relationship between the pressure
ringing and the area movement.
Authors
Topic
Citation
Park, S., Jung, Y., and Bae, C., "Diesel Knock Visualization and Frequency Analysis of Premixed Charge Compression Ignition Combustion with a Narrow Injection Angle," SAE Technical Paper 2013-01-0906, 2013, https://doi.org/10.4271/2013-01-0906.Also In
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