| Popis: |
A new stratified charge system, which employs a thin fan–shaped fuel spray and a shell–shaped position cavity, has been developed for direct injection gasoline engines. In order to clarify the characteristics of stratified mixture formation and combustion, spray motion visualization, local fuel concentration in piston cavity, and frame behavior observation were performed. The newly developed system achieves stable stratified combustion in the high-speed region due to optimized piston cavity shape and fuel spray characteristics, especially suitable spray penetration with high injection pressure which ensures the mixture formation is “robust” against air flow and accelerating mixture diffusion in the cavity. |
