Abstract
Dimethyl ether has been studied as a fuel for homogeneous-charge compression-ignition combustion (HCCI) engine by many researchers. However, there is a difficulty to control the ignition timing in accordance with the engine load. This research newly proposes a DME fueled HCCI combustion engine system with an ignition control by DME-reformed gas (DRG). Authors claim that the DRG that contains hydrogen and carbon monoxide with high anti-knock properties can control the auto-ignition of DME. In the system, the DRG is to be produced by an on board DME-reformer utilizing exhaust heat from the engine. This paper analyzes characteristics of HCCI combustion of DME and two types of DME-reformed gases. One type is by partial oxidation, and the other is by steam reforming. The experiments are conducted by varying the proportion of the fuels and equivalence ratio. The overall thermal efficiency based on DME is also analyzed for ideal reforming conditions.
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