Abstract
On two engines, that are shown in the title, SI-Stratified-GDI specify MITSUBISHI-SI-GDI and CI-Pre-Mixed-DI is NISSAN-CI-DI-MK Engines. The discussion in this paper is limited in the low and middle load zone without catalyst, Searched points to have not been clarified, would be written as follows ; In GDI, 1) The radical forming in GDI' spray flame[M-1〜3] suggested this would be generated under HGF condition. 2) To fulfill 1), the concept of the CVCC-REABP phenomenon[Ma-1, 2] was adopted. 3) To fulfill for the REABP phenomenon of 2), STIM that is the earlier burned layer fed back to the unburned layer has been presumed. 4) High-speed rotating stratified vortex in MITSUBISHI-GDI fulfilled the demand of 3). Next in MK, 5) Stratified swirl of Swirl Ratio=12 and extraordinary retarded ignition delay suggested the formation of STIM & REABP phenomenon shown in 2, 3), also in the same way the formation of HGF condition and radical formation under such similar physical and chemical condition, as shown above in GDI were expected. 6) These concepts of STIM, REABP and radical forming were the key of making the causality to clear this SRFNP in these two engines. The pur-pose of this paper is to predict by lighting up onto both combustion mechanisms from a quite different view angle as ever. Then, it will anticipate some contribution still quantitative but it clarifies the causality from the foreseeing situation on the development of this kind of stratified combustion engine. Enumerated conclusion is shown as follows ; 1) MK was also stratified similar as GDI with high-speed swirl. 2) In GDI, the duration after the injection finished to the ignition timing which has created MK zone acted the important factor as same as MK. 3) The complicated STIM, either not propagation nor diffusion combustion much affected to SRFNP. 4) In GDI and MK accompanied by STIM and REABP, then the states LGF and HGF states were formed. 5) Measured radical in GDI was born through HGF with REABP phenomenon as shown in 4) and the forming of radical in MK would be similarly done as in GDI. 6) In GDI and MK, there was a combination of external EGR, the rotating stratification flow, the ignition timing, STIM and REABP phenomenon commonly. With these, it became the forming of HGF and radical. These contributed on the attainment of SRFNPH and this mechanism in both combustion engines, that the author foreseen would be in the high grade of possibility in things above mentioned.
