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Unburned Gas Temperature Measurements Using Cars Technique in a Single Cylinder Spark-Ignition Engine
Published June 28, 1996 by Society of Automotive Engineers of Korea in South Korea
Event: KSAE Spring Conference
We have simultaneously measured the cylinder pressure and the unburned gas temperature by using CARS (Coherent Anti-Stokes Raman Spectroscopy) at different engine speeds and ignition timings in a single cylinder spark-ignition engine. The temperature measurement location was 8 mm apart from the spark plug. The unburned gas temperature in the cylinder varied between 500 K and 700 K and the standard deviation of the temperature during the measured 50 cycles in each crank angle was about ± 70 K. At lower engine speed, the standard deviation of the temperature increased due to the unstable combustion. Both the absolute temperature of the unburned gas and the rate of the temperature increase became higher, as the ignition timing was advanced.