Abstract
We investigate spatial temperature fluctuations in the unburned endgas of a spark-ignited (SI) engine. Our approach exploits the fact that the quantities (species concentrations, temperature) comprising the state of the combustion chamber gases are not independent, but often correlate sharply. Information about spatial temperature variations is obtained indirectly by observing two complementary quantities that sensitively reflect the local temperature. Spatial formaldehyde (H 2CO) concentration variations in the endgas are converted to temperature fluctuations using calculated correlations between temperature and [H 2CO]. Additionally, the geometrical size of inhomogeneities is deduced from LIF-images displaying the locally varying formation of temperature-sensitive intermediate species. The results indicate that temperature fluctuations exceeding 20 K are present in the nominally homogeneous endgas. The geometrical size of these fluctuations ranges from ≈1 mm to ≈1 cm.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
