Abstract
To assist in the development and analysis of new diesel combustion systems with the features of a common-rail injection system such as multiple injections, an advanced single-cylinder optically accessible engine with a very wide observation field was developed. The combustion chamber of this engine can be viewed from the top, bottom, and side. In addition to direct observation of phenomena in the piston cavity and squish area, 2-dimensional laser diagnostics for arbitrary cross sections are also possible. This paper introduces the details of this engine. Also, the following examples of in-cylinder visualization with this engine are introduced; 1) direct observation of the soot reduction mechanism by after-injection, 2) visualization of mixture formation of pilot-injection using LIF, 3) validation of in-cylinder EGR stratification technique by LIF measurement.
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