Classical combustion diagnostics as applied to diesel engines

TL;DRAbstract

In an effort to characterize gross mixing in an IDI diesel, researchers added sulfur hexafluoride to the inlet air. The extent of its decomposition at combustion temperature, presumed to indicate mixedness, was measured using gas chromatography. The technique responded in the anticipated manner to changes in engine speed, load, intake throttling and, to some extent, variations in the cross-sectional area of the interchamber passageway. Augmenting the intake air with either oxygen or nitrogen uncovered some unresolved anomalies about this method.

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