Analysis of CO Emission Sources in Diesel Combustion (Second Report)

- Validation of Numerical Simulation and Analysis of CO Emission Sources -

Abstract

In-cylinder CO distribution in diesel combustion was measured using two-photon excitation CO-LIF. The results obtained with CO-LIF were used to validate the accuracy of a numerical simulation. The measured location of the dense CO gas cloud, as obtained by the LIF measurement, agreed closely with the results of the simulation. The major source of the CO emissions under low-load conditions is the over-diffusion of the pilot sprays, while that under high-load conditions is the shortage of oxygen in the rich regions at the flame front.