We present a quantitative planar laser-induced fluorescence (PLIF) method for imaging the in-cylinderfuel concentration in a spark-ignition engine. The method is based on fluorescence from a carbonyl compound added to the fuel and excited by an excimer laser at 308 nm. The method has been applied to the study of charge stratification in a lean burn engine equipped with a four-valve pent-roof clinder head. In this engine, stratification is achieved by fuel injection through an inlet valve, the paths of rich fuel pockets from induction through compression to the point of ignition is shown by a series of crank-angle-resolved air-to-fuel ratio (AFR) images. © 1994 Combustion Institute.
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