CFDによるディーゼル機関における未燃炭化水素生成の予測

概要

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The generation of unburned hydrocarbon emissions due to physical effects was studied using KIVA-II. The results showed that exhaust hydrocarbons increase due to poor mixing of fuel with air during the ignition delay period at the low swirl case, and bulk quenching due to the high mixing rate and high heat loss to the wall during the combustion and expansion processes in the high swirl case. The re-entrant combustion chamber is advantageous for unburned hydrocarbon emissions in the case of retarded injection timing, but this modification produces excessive mixing and bulk quenching for advanced timing and, as a consequence, higher hydrocarbon emissions.
一般社団法人日本機械学会の論文
1997-11-25