オリフィス下流乱流場のPIV計測(乱流(3),一般講演)

概要

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In this paper, the flow field data behind the orifice inside a pipe based on PIV measurements are analyzed and interpreted. POD analysis is applied to extract the most dominant modes of the flow field. And in order to assess the effects of orifice size and Reynolds number on flow characteristics, both visualization and quantitative description are employed. Results reveal that different number of dominant modes are needed to describe different aspect of the flow fields, and there is a reattachment point downstream, whose position is strongly dependent of orifice size, whereas almost independent of Reynolds number. In a statistical sense, large-vorticity areas are formed at the edge of the orifice, and Reynolds number plays a less and less important role on the maximum vorticity with the increasing of orifice size, and the maximum value of turbulent kinetic energy has approximately linear relationship with Reynolds number at all orifice sizes.
2010-09-09