Abstract
An advanced single-cylinder DI deisel engine for visualizing in-cylinder phenomena has been developed. The combustion chamber of this engine is optically acsessible from three directions of top, bottom, and side. Furthermore, a transparent glass part is set around the cavity on the top of the extended piston and thus in-cavity phenomena is also observed. In additon to direct photography and shadowgraphy from each direction, laser light sheet techniques such as laser-induced fluorescence (LIF) and laser-induced incandescence (LII) can be applied. For example, fuel vapor distributions in both cavity and squish areas have been clearly measured by using LIF imaging.
