単組成ガス燃料吸入時におけるディーゼル機関の燃焼と性能

概要

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The combustion characteristics and engine performance in both DI and IDI type diesel engines with the different gaseous fuels induced from the intake manifold are systematically investigated. The gaseous fuels tested include paraffin fuels (methane, ethane, propane, and butane), olefin fuel (ethylene), and acetylene.<BR>The results of the experiments show that in the DI engine the specific energy consumption and exhaust smoke density especially at higher loads are greatly improved with increase in the amount of gaseous fuel, while NOx emissions increase for all kinds of the gaseous fuels. In the IDI diesel engine, however, gaseous fuel induction affects engine performance only little.<BR>Severe diesel knocking limits the maximum amount of inducted gas, decreasing with higher carbon number of the gaseous fuel. The maximum limit before knocking in the DI type engine is higher than that in the IDI type.<BR>Laser shadowgraphy analysis shows that soot oxidation in the combustion chamber is promoted with the gaseous fuel induction.