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후퇴익형 형상의 와류발생기가 있는 핀휜 유동의 전열 및 유동 특성 분석에 관한 수치적 연구
이창형(Changhyeong Lee),오영택(Yeongtaek Oh),배지환(Jihwan Bae),이득호(Deukho Lee),김귀순(Kuisoon Kim) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.4
In this study, pin-fin arrays, which are widely used for cooling turbine blades, were studied. The vortex generator in pin-fin arrays is located in front of the circular tube. The cross-section of the vortex generator is NACA-9410. The purpose of this study is to analyze heat transfer performance and flow characteristics of pin-fin arrays. The position of vortex generator is changed with the vertical flow direction on the bottom wall. Pin-fin arrays were calculated with 6000, 10000 and 15000 Reynolds number. The commercial program ANSYS v18.0 CFX and the turbulence model k-ω SST were used. As a result, the heat transfer performance increased up to 5.8% and pressure loss increased less than 1%.
후퇴익형 형상의 와류발생기가 있는 핀휜 유동의 전열 및 유동 특성 분석에 관한 수치적 연구
이창형(Changhyeong Lee),오영택(Yeongtaek Oh),배지환(Jihwan Bae),이득호(Deukho Lee),김귀순(Kuisoon Kim) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12
본 논문에서는 터빈 냉각에 흔히 사용되는 핀-휜 유동에 관한 연구를 진행하였다. 본 연구에서 핀-휜 배열 전방에 후퇴익형 와류발생기를 가지며 익형 단면 형상은 NACA-9410을 사용하였다. 와류발생기 위치를 유동에 수직인 방향으로 변화시키며 성능을 기존의 핀-휜 유동과 비교하였다. 레이놀즈수 영역은 6000 ~ 15000에서 계산하여 비교하였으며 전산 해석을 위해 상용프로그램인 ANSYS v18.0 CFX, 난류 모델은 k-ω SST를 사용하였다. In this paper, we have studied pin-fin arrays which have widely being used method to enhance turbine blade heat transfer. In this study, vortex generator was used in front of the pin-fin arrangement, and the cross-sectional shape of the airfoil was NACA-9410. We calculated Reynolds number from 6000 to 15000 and used turbulence model k-ω SST for computational analysis. Pin-fin arrays was analyzed using the commercial program ANSYS v18.0 CFX.
가이드 베인을 부착한 핀-휜 유동에서 가이드 베인 위치와 입사각에 따른 전열 및 유동 특성에 관한 수치적 연구
이득호(Deukho Lee),오영택(Yeongtaek Oh),배지환(Jihwan Bae),이창형(Changhyeong Lee),김귀순(Kuisoon Kim) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.3
In this study, a guide vane with varying positions and incidence angles was adopted to a pin-fin channel to analyze the change in thermal performance and pressure loss characteristics. A numerical analysis was conducted to investigate the effect of incidence angles and positions on heat transfer and flow characteristics at Re =1400. The results of it were compared those of a pin-fin channel without a guide vane. In case 1 when the incidence angle is 0˚ , the heat transfer performance is maximized and improved by approximately 5% when compared to the pin-fin channel without the guide vane. In case 2 when the incidence angle is 10˚ , the pressure loss is minimized and decreased by approximately 1.9% when compared to the pin-fin channel without the guide vane.
The Fabrication Method of Tip Array by Glass Deep Dry Etching Process
박태규(Tae Gyu Park),민정기(Junggi Min),오영택(Yeongtaek Oh),한동철(Dong-Chul Han) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
The process of making the etch mask for the glass dry etching is complicated and its cost is high. To reduce these disadvantages, we suggest the glass dry etching method using a single photoresist (PR) mask. In this works, we figured out the optimized condition for the dry etching using the photoresist without any metal or silicon mask. We observed the characteristics of quartz wafer, such as the etch profile, etch rate, the selectivity and the critical dimension (CD) loss rate.