NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
53rd NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
Session ID : 1D4
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OS17
3D Velocity Measurement of Turbulent Round Jet Using Scanning Stereo PIV
*Toshio Hori
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Abstract
Scanning stereo-PIV system was developed to measure the three-dimensional distribution of three-component velocity in a turbulent round jet. A laser light sheet produced by high repetition rate YLF pulse laser was scanned by an optical scanner in a direction normal to the sheet. Two of high-speed mega-pixel resolution C-MOS camera captured the particle images illuminated by the light sheet, and stereoscopic PIV method was adopted to acquire 3D-3C-velocity distribution of turbulent water flow. The water jet formed by a round nozzle with exit diameter D=5 mm was diagnosed by the current technique. The jet Reynolds number was set at Re=1000, and streamwise location of the measurement was fixed around x=45D. A measurement volume (~100x100x100mm3) containing 50 velocity planes was scanned within 0.2s. Iso-vorticity surfaces clearly depict hairpin type structures in the jet shear layer.
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© 2004 Committee for Mechanics and Structure,Science Council
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