Abstract
An experimental study on emission formation processes, such as nitric oxide, particulate and total hydrocarbon, in a small D. I. diesel engine was carried out by using a total in-cylinder sampling technique. The sampling method was composed of rapidly opening a bolwdown valve attached to the bottom of the piston cavity, and quickly transferring most of the in-cylinder contents into a large sampling chamber below the piston. The sampling experiment gave a history of spatially averaged emission concentrations in the cylinder. The effects of intake swirl ratio and injection timing on the emission formation processes were investigated.
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