대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제27권11호
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  • Pages.1618-1629
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  • 2003
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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과도 액정 기법을 이용한 와동발생기 하류의 유동장 및 열전달 측정

Detailed Measurement of Flow and Heat Transfer Downstream of Rectanglar Vortex Generators Using a Transient Liquid Crystal Technique

  • 홍철현 (부산대학교 기계설계전산화인력양성센터) ;
  • 양장식 (부산대학교 기계기술연구소) ;
  • 이기백 (부산대학교 기계공학과 기계기술연구소)
  • 발행 : 2003.11.01
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초록

The effects of the interaction between flow field and heat transfer caused by the longitudinal vortices are experimentally investigated using a five hole probe and a transient liquid crystal technique. The test facility consists of a wind tunnel with vortex generators protruding from a bottom surface and a mesh heater. In order to control the strength of the longitudinal vortices, the angle of attack of vortex generators used in the present experiment is 20$^{\circ}$, and the spacing between the vortex generators is 25mm. The height and cord length of the vortex generator is 20mm and 50mm, respectively. Three-component mean velocity measurements are made using a f-hole probe system, and the surface temperature distribution is measured by the hue capturing method using a transient liquid crystal technique. The transient liquid crystal technique in measuring heat transfer has become one of the most effective ways in determining the full surface distributions of heat transfer coefficients. The key point of this technique is to convert the inlet flow temperature into an exponential temperature profile using the mesh heater set up in the wind tunnel. The conclusions obtained in the present experiment are as follows: The two maximum heat transfer values exist over the whole domain, and as the longitudinal vortices move to the farther downstream region, these peak values show the decreasing trends. These trends are also observed in the experimental results of other researchers to have used the uniform heat flux method.

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참고문헌

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