Abstract
In this study, in-cylinder flow for a boosted GDI engine is investigated on an optical engine with a transparent sleeve using high speed PIV. A result of analysis of entire flow, a generated tumble flow in intake stroke is kept until the end of compression stroke. For investigation of turbulence, adequate time resolution is clarified and it is confirmed that cut-off frequency for a time filtering method is almost corresponded with a large time scale of flow, generated by piston motion. According to analysis, it is found that optimization of piston top shape is effective for enhancement of in-cylinder flow.
