Abstract
Crank angle resolved monitoring of formaldehyde using laser-induced fluorescence (LIF) has been conducted at homogeneous charge compression of dimethyl ether (DME) -air mixture in an externally motored single cylinder piston engine. In order to correct the raw LIF intensity profiles, which are significantly influenced by collisional quenching and pressure broadening, fluorescence lifetime and spectral linewidth of the observing transition were evaluated as a function of crank angle. It is clearly demonstrated that formaldehyde is promptly generated at the cool flame and disappears at the thermal flame in the two-stage autoignition, as expected by the simulation using the detailed DME oxidation mechanism of Curran et. al.
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