Spatial Evaluation of In-Cylinder Turbulence Flow Using High-Resolution PIV

Abstract

Fig.1 Quasi-intantaneous velocity distributions. (a) TGV Open 2m/s 2mm (b) TGV Close 2m/s 2mm Fig.2 Large-scale vorticity 2700(1/sec)-2700(1/sec) (a) TGV Open (b) TGV Close 2mm 2mm 600rpm WOT TDC Y X IN IN EX EX ABSTRACT Two-color dual sweep PIV has been developed and examined to measure quasi-instantaneous two-dimensional velocity data in a practical engine. The particle-seeded flow field was illuminated by scanning laser beams(blue and green) of Ar laser. Direct picture was taken at TDC compression with 1.7 magnifications, resulting in paired particle images distinguished by color. The results indicate that this type of PIV could provide useful information of complex turbulence flow as well as counter like tumbling flow, and also the spatial resolution achieved was adequateto resolve the few mm turbulence integral length scales.