Combustion radicals observation of DME diesel engine by spectroscopic method (2nd report) - observation using band-pass filters

摘要

Combustion radicals of a direct injection DME-Fueled compression ignition engine were observed using a high-speed image intensified video camera with band-pass filters. All of radicals could be observed as images with wavelength resolution (half-width) of about 10 nm. Rich DME leaked from nozzle was burning at the end of combustion. Therefore, the second light emission of C2 radical was observed. The light of OH emitted all over the DME spray at the combustion started, then the dim light expanded in combustion chamber. The light intensity of CH radical around the combustion chamber wall became strong with advancing the combustion.