マイクロホールノズルを用いた直噴式ディーゼル機関の着火,燃焼および排気特性

概要

論文の詳細を見る
In an attempt to achieve lean combustion in Diesel engines which have a potential for simultaneous reduction of NO and soot levels, the authors developed a micro-hole nozzle which has orifices with a diameter as small as 0.06 mm. Combustion tests were carried out using a rapid compression-expansion machine which has a DI Diesel-type combustion chamber equipped with the micro-hole nozzle. A comparison with the results of a conventional nozzle experiment revealed that the ignition delay was reduced by 30%, in spite of which both peaks of initial premixed combustion and diffusion combustion increased significantly. The combustion in the case of the micro-hole nozzle experiment was accompanied by a decrease in soot emission, and an increase in NO emission. The trends in the heat release pattern and exhaust emissions described above could possibly be attributed to the fact that locally stoichiometric mixtures which are responsible for NO formation still remain in the combustion region in the flame even if the mean equivalence ratio in the flame is lean.
一般社団法人日本機械学会の論文
1996-02-25