Direct Observation of Clean Diesel Combustion using a Bore Scope in a Single Cylinder HDDE
Date Published: 2009-04-20
Paper Number:2009-01-0645
DOI: 10.4271/2009-01-0645
Citation:
Fujino, R., Aoyagi, Y., Osada, H., Yamaguchi, T. et al., "Direct Observation of Clean Diesel Combustion using a Bore Scope in a Single Cylinder HDDE," SAE Technical Paper 2009-01-0645, 2009, doi:10.4271/2009-01-0645.
The bore scope system can visualize not only diesel combustion in the research engine but also in actual diesel combustion in a multi-cylinder engine. The experimental engine has 2.0-liter displacement and has an external supercharger with up to two times the boost pressure of the naturally aspirated engine condition. The video camera used for this study is nac GX-1. From observed data under the several experimental conditions such as increased injection pressures, swirl ratios, and EGR rates, the flame temperature and KL factor were obtained by two-color method analysis. The diesel combustion processes are understood well by analyzing high-speed movies of the diesel flame motion and its temperature. NOx and smoke are mutually related to maximum flame temperature even in an engine with low NOx emission and lean smoke. It is reconfirmed as necessary to maintain a maximum flame temperature of 2,000–2,200K to reduce emissions of NOx and smoke simultaneously.
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