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

The Korean Society of Mechanical Engineers (대한기계학회)
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Heat (mass) transfer measurement and analysis with flows around film cooling holes and circular cylinders

막냉각홀 주위와 원형돌출봉 주위에서의 열(물질)전달의 측정과 해석

  • Kim, B.G. (Dept.of Mechanical Engineering, Graduate School of Yonsei University) ;
  • Wu, S. J. (Dept.of Mechanical Engineering, Graduate School of Yonsei University) ;
  • Cho,H. H. (Dept.of Mechanical Engineering, Yonsei University)
  • 김병기 (연세대학교 대학원 기계공학과) ;
  • 우성제 (연세대학교 대학원 기계공학과) ;
  • 조형희 (연세대학교기계공학과)
  • Published : 1997.11.01
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Abstract

The present study investigates heat/mass transfer around film cooling jets and circular cylinders to compare the characteristics of each other. Experiments are conducted to obtain the detailed heat/mass transfer coefficients of flat plate with injections through an array of holes and for flows around an array of protruding circular cylinders using the naphthalene sublimation technique. The inclination angles of cylinders are set to the same ones of jets; a, the angle between the jet and the surface is fixed at 30 deg. through the whole experiments and .betha., the angle between the projection of the jet on the surface and the direction of main stream is adjusted to 0 deg., 45 deg. and 90 deg. to investigate the effect of variation of injection angles. The influence of blowing rates of jets and those of cylinder length to diameter ratios are also investigated. The results indicate that the increase of angle .betha. influences the spanwise uniformity of heat/mass transfer remarkably for both jets and cylinders, but that variation of cylinder length to diameter ratios has weaker effects on heat/mass transfer coefficients than that of blowing rates.

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