Abstract
Two-dimensional NO distributions in a steadily running optically accessible diesel engine are observed by laser-induced-fluorescence using a tunable ArF excimer laser at 193 nm. Simultaneous excitation at 226 nm revealed that no sizeable photo-chemical effects influencing the NO distribution are induced by the excimer laser. The measurements are performed in both a directly injected two-stroke engine and an indirectly injected four-stroke engine. The in-cylinder attenuation of the laser beam due to absorption and scattering by particles as well as the reduced transparency of the quartz windows due to soot deposits are taken into account in the evaluation of the NO distributions. Hereto correction procedures are applied involving the measurement of Mie scattered laser light distributions in the motored and the running engine. Results for the corrected NO-LIF distributions are presented as a function of crank angle and load. The consistency of the obtained results is verified by performing measurements with reversed laser beam direction. The NO-LIF distributions show a reproducible evolution as a function of crank angle. The averaged LIF intensity decreases strongly with increasing crank angle, as expected for an early NO formation followed by an expansion.
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