Abstract
In order to increase the brake thermal efficiency and reduce NOx emissions of a stationary diesel engine, a direct injection (DI) combustion system, which consists of a combustion chamber with a high compression ratio and a fuel injection system with a high injection pressure, was installed in a single cylinder diesel engine with a 240 mm bore, and it was tested to investigate its potential and fundamental characteristics. The high compression ratio was proven to have a potential of high brake thermal efficiency and become advantageous on the point of the brake thermal efficiency and NOx emissions at the retard of fuel injection timing. The high injection pressure by means of small nozzle hole diameter restrained the initial combustion, promoted the diffused combustion and increased the effective combustion efficiency. The high compression ratio and high injection pressure with the retard of fuel injection timing improved the brake thermal efficiency and NOx emissions.
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