Visible Flame Imaging of Pre-chamber Combustion in a Large Bore Natural Gas Engine
Precombustion chambers (prechambers) are an enabling technology to facilitate reliable ignition of natural gas engines operating with ultra-lean mixtures. Previous testing indicates that at ultra-lean mixtures, emissions from the prechamber may contribute a significant fraction of engine-out emissions formation in the prechamber as well as in the main chamber. In an effort to support prechamber development, an optical head was manufactured for use on the Cooper-Bessemer GMV engine at theColorado State University Engines & Energy Conversion Laboratory. A high-speed camera was used toimage the prechamber flame jet propelled into the main chamber and the ensuing main chamber combustion. Post processing the video can determine the flame penetration depth into the main chamber,flame development time, and the character of main chamber combustion.
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