Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Development of High-Definition 3D-PTV and its Application to High-Precision Measurements of a Sphere Wake

고해상 3차원 입자영상유속계 개발과 구 유동장 정밀해석 적용연구

  • Hwang Tae-Gyu (Graduate School, Korea Maritime University) ;
  • Doh Deog-Hee (Division of Mechanical and Information Engineering, Korea Maritime University)
  • 황태규 (한국해양대학교 대학원) ;
  • 도덕희 (한국해양대학교 기계정보공학부)
  • Published : 2005.12.01
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Abstract

A Multi-Sectional 3D-PTV algorithm was developed to reduce the calculation time of the conventional GA-3D-PTV. The hardware system of the constructed 3D-PTV system consists of two high-speed cameras ($1,024\times1,018$ pixels, 60 fps), a metal halogen lamp (400W) and a host computer. The sphere(D=30mm) is suspended in a circulating water channel $(300mm\times300mm\times1,200m)$ and Reynolds number is 1,130. About 5,000 instantaneous three-dimensional velocity vectors have been obtained by the constructed 3D-PTV system. Turbulent properties such as turbulent intensity, Reynolds stress and turbulent kinetic energy were obtained. An eigenvalue analysis was carried out using the obtained instantaneous 3D velocity vectors to get the topological relations of the asymptotically stable critical point. Two structured shells, inner shell and outer shell, were found in the sphere wake and their motions were clarified by the measured data.

Keywords

References

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