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Results oflaser diagnostics inside a 6-cylinder heavy-duty diesel truck engine are presented. Optical access is obtained by quartz windows mounted in the cylinder head and in the piston. The engine is running on commercial diesel fuel, causing strong attenuation ofthe UV laser radiation. The sprays are visualized by laser induced fluorescence (LIP) from polycyclic aromatic hydrocarbons present in the diesel fuel. The measurements were focused on the formation of nitric oxide that could be detected by LIP as a function of the crank angle. The fluorescence signals were processed in order to obtain relative NO density curves during the combustion process. Evidence was obtained for the formation ofNO between rather than within the spray flames. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 07/02/2015 Terms of Use: http://spiedl.org/terms Proc. SPIE Vol. 4430 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 07/02/2015 Terms of Use: http://spiedl.org/terms

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