2026-03-07T12:39:03Z https://kitami-it.repo.nii.ac.jp/oai

oai:kitami-it.repo.nii.ac.jp:02000637 2026-02-17T03:57:05Z 1:87

Thermal efficiency improvement in twin shaped semi- premixed diesel combustion with a combustion chamber dividing fuel sprays and optimization of fuel ignitability Kazuki Inaba Yoshimitsu Kobashi Gen Shibata Hideyuki Ogawa The authors have reported significant smoke reduction in twin shaped semi-premixed diesel combustion with a newly designed combustion chamber to distribute the first and the second sprays into upper and lower layers. However, the first stage premixed combustion tends to advance far from the TDC, resulting in lowering of thermal efficiencies. In this report, improvement of thermal efficiency by optimizing the combustion phase with lower ignitability fuels was identified with the divided combustion chamber. The experiment was conducted with four fuels with different cetane numbers. The first stage premixed combustion can be retarded to the optimum phase with the fuel with cetane number 38, establishing high efficiencies. journal article Society of Automotive Engineers of Japan 2023-09-29 application/pdf SAE Technical Paper 0148-7191 https://kitami-it.repo.nii.ac.jp/record/2000637/files/2023PFL_Manuscript.pdf https://kitami-it.repo.nii.ac.jp/records/2000637 eng 10.4271/2023-32-0051 c2023 SAE Japan c2023 SAE International open access