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짧은 못형핀의 형상 변화에 따른 열전달 및 마찰손실 특성
조형희,Cho, H.H.,Goldstein, R.J. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
Average heat transfer coefficients and friction coefficients have been measured from staggered short pin-fin arrays to investigate the effect of fin shapes. Flow entering into the test section is a fully developed duct flow and the Reynolds number ranges from 5,000 to 25,000 based on fin diameter and average approaching velocity. The fin has three different shapes; uniform-diameter circular fin, two stepped-diameter circular fins. Average heat transfer rates change slightly with the fin shapes. However, friction loss(pressure loss) for the stepped-diameter fins is significantly less than that for the uniform-diameter fin. This results indicate that the stepped-diameter fin arrays in duct flow enhance heat transfer rates largely based on unit pumping power.
박광훈(Park K.H),이건우(Lee K.W),조형희(Cho H.H),함희철(Ham H.C),배주찬(Bae J.CH),Oh M.K 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The slot film cooling technique has been used to protect a chamber wall from hot combustion gas. This method has been applicable toramjet combustor and gas turbine. Especially, the multi-slot film cooling method is mainly applicable in the ramjet operating undersupersonic condition. This experimental study has been conducted to investigate effects of a recirculation zone and a lip thickness to slot height ratio on a multi-slot film cooling in the ramjet combustor. A pre-diffuser typed ramjet combustor having a recirculation zone due to the expansion step has been used for this study.