Ignition and formaldehyde formation in dimethyl ether (DME) reacting spray under various EGR levels
Dimethyl ether (DME) an alternative to diesel in compression-ignition engines has gained interest in combustion research due to its high cetane number for fast ignition and ultra-low emission of particulate matter. Ignition and significant intermediate species including CH2O were experimentally studied in a constant-volume combustion vessel facility that includes a fuel injection system for spray-like behavior of liquid DME. Experiments of varied oxygen concentrations simulating several stages of exhaust-gas recirculation (EGR) were done to evaluate its corresponding effect on the flame structure and emissions from DME combustion and showed that there is a supporting link between CH2O formation and low-temperature combustion prior to diffusion-controlled flame uniquely for DME. The study suggested that the onset of CH2O depletion can be utilized as an ignition indicator.
Proceedings of the Combustion Institute
Ignition and formaldehyde formation in dimethyl ether (DME) reacting spray under various EGR levels.
Proceedings of the Combustion Institute,
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