1988-02-01

High Combustion Temperature for the Reduction of Particulate in Diesel Engines 880423

Experiments on the effects of temperature T and equivalence ratio ϕ on soot formation at high pressures up to 5 MPa were conducted. The soot formation region is mapped on ϕ-T diagram using the results obtained in the experiments and the published data. NO formation region is also determined by the Zeldovich equations and is plotted on the same diagram. The time histories of ϕ and T of the flame in a DI diesel engine which was obtained by a gas sampling study, are plotted on the ϕ-T diagram to form a trajectory. Discussion of the trajectory in relation to both soot and NO formation region gives suggestion of a possibility of high temperature - rich mixture combustion to reduce particulate formation in diesel engines.

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