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Technical Paper

Planar Fuel-Air-Ratio-LIF with Gasoline for Dynamic Mixture-Formation Investigations

2007-04-16
2007-01-0645
The investigations performed serve to develop a 2D measurement technique for dynamic mixture formation analysis of fuel and air with almost standard gasoline (Euro Super colorless, without the low volatile bitumen constituents). A measurement concept for fuel-air-ratio detection by laser-induced fluorescence (FARLIF) is validated. The concept is based on 266nm Nd-YAG-laser excitation of the self-fluorescing gasoline and is validated for mixture pressures above 2.5 bar, sufficient air-fraction λ ≥ 0.4 and temperatures at least up to 548 K. The mixture temperature is shown to affect the FARLIF-intensities. The technical feasibility of FARLIF-imaging with almost standard gasoline is successfully demonstrated. Single-shot measurements of transient mixing fields of gasoline and air at engine relevant gas conditions are performed and quantitative fuel-air-ratio maps are generated.
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