Abstract
Homogeneous Charge Compression Ignition (HCCI) engine is the combustion process for reducing NO_x and PM simultaneously, and obtaining high thermal efficiency. In the present engine technology, however, the operating region is limited and it is difficult to control the compression ignition timing in HCCI engine. DME has attracted interest as an alternative fuel in compression ignition engine. It has a negative temperature coefficient region that the ignition delay isn't shortened even if the compression-induced temperature rises. DME also has the multi-stage heat release through both low and high-temperature reactions. In this study, we added the inert gas to DME-HCCI engine, and analyzed the influence of the inert gas on DME-HCCI combustion. As a result, we found that the inert gas influenced the ignition timing in the HCCI engine.
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