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Fluorescence-Based Method Designed for Quantitative Measurement of Fuel Film Thickness during Cold-Start of Engines

Volume 54, Number 4 (April 2000) Page 565-574

Yang, Jiemin; Melton, Lynn A.

The liquid fuel that accumulates in the engine manifold and cylinders during cold start conditions is thought to contribute significantly to excess hydrocarbon emissions. Two fluorescent dopants, cyclohexanone and 2-methyl-cyclopentanone, have been tested for use as fluorescent markers for quantitative two-dimensional (2D) imaging of the thickness of automotive fuel films in the range 0-1 mm. These dopants are co-evaporative with synthetic automotive fuel and have fluorescence that is virtually independent of oxygen concentration equivalent to saturation under 5 atm air at temperatures of 20-200 C. Selection, calibration procedures, and (nonengine) demonstration laser-induced-fluorescence (LIF) imaging experiments are discussed. Index Headings: Fluorescence; Diagnostics; Engines; Liquid films; Cold start.