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디지털 화상처리를 이용한 자동차 후부의 하면형상 이 압력분포에 미치는 영향
백태실(Tae-Sil Baek),조기현(Ki-Hyon Cho),백이(Yeeaek),송동영(Dong-Young Song) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.1
In order to reduce a aerodynamic drag of the rear, body, effects of rear lower end configurauon of a vehicles were investigated by measuring the pressure distribution,visual flow phenomena by the use of digital image processing technique. The use of flow visualization in recent years has improved the general understanding of structure of complex flow and has yielded valuable information for analyzing fluid flow. As the results, it was found that the shape of rear lower part vehicles not only effected on the pressure distribution of the rear part of the vehicle but also difference of the flow phenomena,<br/> <br/>
3D-PTV 와 비접촉식 6 자유도운동 측정시스템에 의한 유체-탄성체구조 연동운동 해석
도덕희(Deog-Hee Doh),황태규(Tae-Gyu Hwang),조경래(Kyeong-Rae Cho),조용범(Yong-Beom Cho),편용범(Yong-Beom Pyeon),백태실(Tae-Sil Baek) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The interaction between the flow fields and the cylinder motion is examined quantitatively. Analysis on a pulsed impinged jet with 3D-PTV system and 6D-Motion Tracking system was made. A pulsed round jet was impinged on a flexible plate and the flow field near the plate was measured with a 3D-PTV system while the motion of the flexible plate was measured with 6D-Motion Tracking system. The measurement system consists of four cameras, a light source (Ar laser) and a host computer. The flow field has been resolved at 500 ㎐ with 1k × 1k pixels with horizontal and vertical cuts of the flow field. The Reynolds number with the nozzle diameter with mean exit velocity was about 20,000. The results obtained by the fully time- and space-resolved measurement can provide unprecedentedly large amount of information from which not only the statistical quantities but also the time evolution of turbulence structures is extracted.
용접재료 별 주강 피스톤 크라운 용접부위의 부식 특성에 대한 평가
문경만(Kyung-Man Moon),김윤해(Yun-Hae Kim),이명훈(Myeong-Hoon Lee),백태실(Tae-Sil Baek),김진경(Jin-Gyeong Kim) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
Wear and corrosion of the engine parts surrounded with combustion chamber is more serious compared to the other parts of the engine because temperature of the exhaust gas in a combustion chamber is getting higher and higher with increasing of using the heavy oil of low quality. Therefore, an optimum repair weldment as well as an available choice of the base metal for these parts are very important to prolong their lifetime in a economical point of view. It reported that there was an experimental result for repair weldment on the forged steel which would be generally used with piston crown material, however, it is considered that there is no study for the repair weldment on the cast steel of piston crown material. In this study, four types of electrodes such as 1.25Cr-0.5Mo, 0.5Mo Inconel 625 and 718 were welded with SMAW and GTAW methods on the cast steel which would be generally used with piston crown material. And the corrosion properties of weld metal, heat affected zone and base metal were investigated using electrochemical methods such as measurement of corrosion potential, anodic polarization curves, cyclic voltammogram and impedance etc. in 35% H2SO4 solution. In the cases of Inconel 625, 718, the weld metals and base metals exhibited the best and worst corrosion resistance respectively, however, 1.25Cr-0.5Mo and 0.5Mo indicated that corrosion resistance of the base metal was better than the weld metal. And the weld metal welded with electrodes of Inconel 625 revealed the best corrosion resistance among the electrodes, and Inconel 718 followed the Inconel 625. Hardness relatively also indicated higher value in the weld metal compared to heat affected zone and base metal. In particular, Inconel 718 indicated the highest value of hardness compared to other electrodes in the heat affected zone.
하이브리드 볼륨측정법에 의한 하부교반 탱크내 혼합유동 측정 및 해석
도덕희(Deog Hee Doh),이창제(Chang Jae Lee),백태실(Tae Sil Baek) 한국가시화정보학회 2012 한국가시화정보학회지 Vol.10 No.3
Experimental data for the flows in a mixing tank with a bottom agitator are useful for the validation of CFD commercial code. A hybrid volume PIV measurement technique was constructed to measure the flows inside of the mixing tank. The measurement system consists of three cameras. An agitator was installed at the bottom of the tank and it rotates clockwise and counterclockwise. Using the constructed measurement system, instantaneous vector fields were obtained. A phase averaging technique was adopted for the measured instantaneous three-dimensional velocity vector fields. Turbulent properties were evaluated from the instantaneous vector fields.