TED-AJ03-302 PERFORMANCE OF THE LOW HEAT REJECTION DIESEL ENGINE USED CERAMIC MATERIAL

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A low heat rejection engine with silicon nitride monolithic ceramic was examined to evaluate the possibility for higher power density in vehicles with smaller-sized engines. The low-heat rejection engines should require less space than conventional combustion engines because of a reduction in size of the engine cooling system and increasing available energies of brake power and exhaust energy. Concurrently, a Rapid Compression and Expansion Machine (RCEM) with a high-speed camera was developed to observe the combustion phenomena in low-heat rejection engines. The performance characteristics of an engine with applied monolithic ceramic materials around a combustion chamber were studied. The engine was a 4-stroke and oil cooled (non-water cooled) diesel engine with 2.0-liters swept volume. The piston crown, head liner, cylinder liner and intake/exhaust port were made of a monolithic ceramic with silicon nitride having a comparatively high fracture toughness. The results of this study confirmed that the engine had 65 kW in rated brake power. In order to further reduce the size of the engine cooling system, it was found that the reducing of the heat rejection to charge-air cooler was essential.[figure]However, it was observed by RCEM that ignition delay duration is shorter with increasing of the combustion chamber temperature. By using specific engine components made of silicon nitride for a combustion chamber, the coolant heat rejection ratio to the provided fuel energy became much smaller than that of conventional engines. The combustion deteriorations in higher-temperature combustion were optically observed and combustion characteristics in low heat rejection-combustion chamber were studied.[figure]

TED-AJ03-302 PERFORMANCE OF THE LOW HEAT REJECTION DIESEL ENGINE USED CERAMIC MATERIAL

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