Abstract
In this study, the flame temperature is visualized in a newly designed optical access diesel engine in order to investigate the mechanism of soot emission at transient operation mode. This single cylinder diesel engine has hydraulic variable valve system and an optical access window instead of an exhaust valve. Optical access window has cleaned by the laser cleaning technique in which the soot on the window is vaporized by the Nd:YAG laser incident. Using this optical engine, high speed photographs of flame were taken under transient operation, and flame temperature was analyzed by two color pyrometry.
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