Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Heat Transfer in a Two Wall Divergent Rectangular Channel with V-Shaped Ribs on One Wall

한 벽면에 V형 리브가 있는 2면 확대 사각채널의 열전달

  • 이명성 (경상대학교 대학원 기계시스템공학과) ;
  • 안수환 (경상대학교 해양산업연구소 기계시스템공학과)
  • Received : 2015.06.16
  • Accepted : 2015.08.17
  • Published : 2015.10.31
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Abstract

The present study is to investigates the convective heat transfer characteristics and pressure drop inside the rib-roughened cooling passage of gas turbine blades. The divergent rectangular channel is fabricated with V-shaped ribs on one wall only and the inlet hydraulic diameter to outlet hydraulic diameter ratio($D_{ho}/D_{hi}$) of 1.49 is used. The current investigation has covered a Reynolds number (Re) range of 22,000~75,000, relative roughness height ($e/D_h$) of 0.1~0.2, and rib angle of attack (a) of $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$ for a fixed relative pitch of 10. Results show that the Nusselt numbers are the greatest in the $60^{\circ}$-angled ribs; however, the total friction factors are the highest in the $30^{\circ}$-angled ribs.

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References

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