In order to achieve hydrogen-fueled diesel engine. authors suggest the hydrogen combustion with ignition-assist method of Dimethyl ether(DME).The in-cylinder temperature is raised through a reaction in compression stroke by adding DME to intake gas. 1[he ignition-assist method of DME shorteried the auto-ignitiori delay of hydrogen, and obtained the stable auto-ignition of hydrogen. Ihe characteristics of hydrogen auto-ignition and combustion processes with this method were grasped in several conditions for suitable combustion methodology

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