Abstract
To obtain the strategy for reducing NO_x emissions and pressure rise rate in PCCI-based diesel combustios, a fundamental study was performed on spray combustion with long ignition delays using a constant volume vessel. NO mass in the combustion chamber was measured with a total gas sampling method and heat release rate data were analyzed varing injection pressure, nozzle orifice size, ambient oxygen mole fraction and fuel ignitability. To cralify the fuel-air mixing conditions which provide reduced NO formation and maximum heat release rate, the data are plotted against the fuel mass fraction in a spray at ignition, which is proposed as an index of mixing progress. Based on the results, explanations are given for the difference of the trend between NO mass and maximum heat release rate.
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