| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 97 === The world oil price rises steadily and the environmental protection consciousness increases, how to enhance the thermal efficiency the diesel engine and to reduce the pollutant the production is the urgent matter. A homogeneous charge compression ignition (HCCI) method can enhance the thermal efficiency of a DI diesel engine and reduce exhaust emissions. If we apply a HCCI method to the CCDE system, we could use the characteristic of HCCI that can reduce pollutant so as to increase the life of CCDE system.
This article is aimed at the KUBOTA RK-125 which is a single cylinder direct injection diesel engine and conducts a combustion experiment performance. The numerical simulation uses KIVA3V- RELEASE2 as the basis of the program by modifying the models of the pollution. The cylinder pressure and emissions including nitrogen oxides (NOx), carbon dioxide (CO2), carbon monoxide (CO), soot concentration and soot average particle diameter for a homogeneous charge compression ignition engine are calculated under different ratios of premixed fuels, intake gas temperature, and different engine speeds. The results between the simulation and the experiment will be compared.
The research has already implemented the fuels of methanol, ethanol, and gasoline successfully in the intake process with different intake gas temperature to carry out a stable diesel engine experiment. Experiment and simulation results show that enhancing the inlet temperature can have reduced the CO and HC pollutant concentrations. Future hopes for this experiment results has a reference value on extending the closed cycle diesel engine system running time.
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