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In-Cylinder Observations of Chemiluminescence in Turbulent Premixed Flames Using a Spark Plug Sensor with an Optical Fiber
Technical Paper
2013-01-2578
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The purpose of this study was to characterize the air/fuel ratio (AFR) of turbulent premixed flames in a spark-ignition (SI) engine. We developed a spark plug sensor with an optical fiber to detect the chemiluminescence spectra, specifically the intensity of the spectral lines related to OH*, CH*, and C2* free radicals. The sensor was composed of a sapphire window and optical fiber and is applicable to automobile SI engines. Measurements of the chemiluminescence intensity from OH*, CH*, and C2* radicals were obtained in turbulent premixed flames with a propane-air mixture for different AFRs in a compression-expansion machine (CEM). The performance of the spark plug sensor was compared with a Cassegrain reflector using an intensified charge-coupled device. The results showed good agreement with measurements obtained using the Cassegrain reflector. The spark plug sensor was shown to be useful for measuring chemiluminescence of turbulent premixed flames in an SI engine. Additionally, the performance of the sensor was evaluated using a high-speed camera, and the chemiluminescence intensity was shown to be related to the time-resolved optical images.
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Citation
Kawahara, N., Inoue, A., and Tomita, E., "In-Cylinder Observations of Chemiluminescence in Turbulent Premixed Flames Using a Spark Plug Sensor with an Optical Fiber," SAE Technical Paper 2013-01-2578, 2013, https://doi.org/10.4271/2013-01-2578.Also In
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