2019 Volume 61 Issue 197 Pages 231-238
In order to clarify the relationship between flame and turbulent flows in various combustion devices, it is one of the important factors to consider from the viewpoint of the fine scale structures of turbulent flow. In this article, direct measurement of turbulent fine structure by multi-plane stereoscopic particle image velocimetry (PIV) is introduced, and the measurement techniques, such as Stokes number of seeding particles, spatial resolution of PIV, calculation method of velocity gradients, are discussed from the fine scale structure of turbulent flow. Furthermore, the estimation method of turbulence characteristics by using single plane PIV is explained using the case of micro PIV for an optical gasoline engine in recent years.
