90°曲がり円管内乱流のステレオPIV計測(流体計測・実験(4),一般講演)

概要

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We measured three-components velocity distribution in cross sections of fully developed turbulent pipe flow behind a bend by means of stereo PIV. Reynolds number ranges from 8000 to 120000, and ratio of inner diameter d of the pipe and radius of the centerline of the bend was 1.3. Symmetrical counter-rotating vortices was evident in a mean velocity field in cross sections of pipe behind bend, and it disappeared at streamwie location z=25d measured from the bend. Lateral location of the maximum mean velocity, which displaces to outer side of the curvature immediate downstream of the bend, approaches to the centerline until z=70d. Temporal variation of streamwise component of vorticity provides that the counter-rotating vortices does not stay symmetric and strength of the vortices fluctuates in a frequency similar to that of the shedding frequency in the separation region of the bend.
日本流体力学会の論文
2008-09-04