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The constant pressure turbocharge system is widely used in marine diesel engines because of its high thermal efficiency. This study has been made to establish a simulation system for exhaust gas pulsation of the constant pressure turbocharge system and to clarify its characteristics. The previous paper reported that the pressure fluctuations measured on test units and some engines agreed very well with those simulated by the scheme developed in this study. The study used the characteristic method for solving the differential equations of unsteady flow. This report will first discuss the high thermal efficiency of this turbocharge system in the range of high mean effective pressure, then it will show the advantages of the two-step Lax-Wendroff’s method in solving the unsteady flow equations in comparison with the characteristic method. Furthermore, it will present some characteristics of the pulsation and the unique pulsation resonance in this turbocharge system.

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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