Diesel Knock Visualization and Frequency Analysis of Premixed Charge Compression Ignition Combustion with a Narrow Injection Angle 2013-01-0906
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.
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. Download Citation
Stephen Sungsan Park, Yongjin Jung, Choongsik Bae
Korea Advanced Inst. of Science & Tech.