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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

INVESTIGATIONS ON THE TURBULENCE BEHAVIORS OF THE CYLINDER WAKE WITH A NEW VOLUME PTV

pages 411-416
DOI: 10.1615/TSFP6.640
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ABSTRAKT

Turbulence properties of a cylinder wake(d=10mm) have been investigated with a new volume PTV algorithm. The measurement system consists of of two-high-definition-cameras(1k × 1k), a Nd-Yag laser and a host computer.
A fitness function representing two-dimensional coherency has been adopted to sort out spurious vectors. A hybrid fitness function representing the relations between the fitness and the three-dimensional shortest distances constructed by the two collinears of the two cameras has been also adopted.
The constructed algorithm has been employed for the measurements of the cylinder wakes. The Reynolds numbers tested in this paper are 360, 540, 720, 900, 1080 and 1260. More than 10,000 instantaneous 3D vectors have been obtained by the constructed system. The volumetric distributions of the turbulence intensities (for u', v', w') indicates that clearly different patterns for all Reynolds numbers and implies that a regular pattern (like a similarity rule) for the turbulent properties exists.

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