TED-AJ03-397 HOMOGENEOUS CHARGE COMPRESSION IGNITION COMBUSTION WITH DIMETHYL ETHER : ANALYSIS OF TWO-STAGE HEAT RELEASE :

NDLデジタルコレクション 被引用文献1件

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Although homogeneous charge compression ignition (HCCI) engines are expected to have both higher thermal efficiency and lower nitrogen oxide (NOx) emissions, they still have problems with high hydrocarbon (HC) and carbon monoxide (CO) production, high rates of heat release, and difficulty in controlling auto-ignition. In order to control auto-ignition in HCCI engines, the reaction mechanism of auto-ignition must be understood. Dimethyl ether (DME), a promising alternative fuel that is suitable for compression ignition engines, shows very strong low-temperature kinetic reactions in HCCI. HCCI combustion shows a peculiar two-stage heat release. The first stage of the heat release curve is associated with low-temperature kinetic reactions, and the time delay between the first and main heat release is attributed to the negative temperature coefficient regime. A study of HCCI fueled with DME may provide useful information on the low-temperature kinetic reactions in HCCI operation. This study investigated the auto-ignition characteristics of an HCCI engine fueled with DME using a single[figure] cylinder engine with a transparent piston. The engine was operated at 800 rpm with a wide-open throttle. The intake-premixed mixture was preheated with an electric heater to promote auto-ignition. HCCI combustion was examined using instantaneous flame images obtained from a high-speed video. The influences of equivalence ratio and intake temperature on the characteristics of auto-ignition in the HCCI engine were investigated. Spectrum analyses of chemiluminescence using spectroscopy were carried out to investigate the two-stage heat release. Three main conclusions were drawn from this study. (1) The hot-flame reaction progresses homogeneously. DME combustion was found to be non-luminous. (2) With increasing intake temperature and equivalence ratio, varying heat release was observed. Three-stage heat release was also observed. (3) During the main heat release, the CO-O recombination spectrum was strong. There was a strong correlation between rate of heat release and the CO-O recombination spectrum.[figure]

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