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RISS 인기검색어
- 검색키워드
- 저자 : 손현철(Hyun-chull Sohn) (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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손현철,박상규,Sohn, Hyun-Chull,Park, Sang-Kyoo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
In the present steady the flow characteristics of turbulent steady flows were experimentally investigated in the exit region of join stream. The experimental was carry out to measure the velocity profiles of air in a square duct. For the measurement of velocity profiles, a hot-wire anemometer was used. The experimental results shows that the velocity profiles do not change behind the fully developed flow region , which is defined as dimensionless axial direction x/Dh=50. In addition, the gradient of shear stress distribution became stable as the flow reached progress downstream.
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손현철(Sohn Hyun-Chull),박길문(Park Gil-Moon),고현선(Go Hyun-Sun),이행남(Lee Haeng-Nam) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.4
A objective of this study is to identify the characteristics of mean velocity distribution through CFD analysis for various driven nozzle position changes. The analysis was done for different Reynolds number in entrance region of jet-pump and for several diameter ratios of driven nozzle. (1) The largest absorption energy was found at the point s=1 in condition of diameter ratio 1:3.21 and point s=0.5 in condition of diameter ratio 1:2.25. (2) The absorption energy was not related to the change of entrance velocity and the driven nozzle position having the largest absorption energy was function for cross section ratio. (3) As the position of driven nozzle moves to the downstream, the absorption energy gets weaker. Because the energy from swirl was lost at the cross section gets smaller. (4) As the position of driven nozzle moves to the downstream, the injection energy leans to the upper direction wall and as the Reynolds number increase, the lean phenomenon is more distinct. (5) The flow quantity of driven nozzle, the diameter ratio 1:3.21, was 32% higher than that of 1 : 2.25 and as the inlet velocity gets faster the efficiency decreased. And as the cross section of the driven nozzle increases.
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가진 펌프에 연결된 곡관덕트에서 난류진동유동의 전단응력분포와 압력분포
손현철,이홍구,이행남,박길문,Sohn, Hyun-Chull,Lee, Hong-Gu,Lee, Haeng-Nam,Park, Gil-Moon 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.4
In the present study, flow characteristics of turbulent oscillatory flow in an oscillator connected to square-sectional $180^{\circ}$ curved duct are investigated experimentally. In order to investigate wall shear stress and pressure distributions, the experimental studies for air flows we conducted in a square-sectional $180^{\circ}$ curved duct by using the LDV system with the data acquisitions and the processing system. The wall shear stress at bend angle of the $150^{\circ}$ and pressure distribution of the inlet (${\phi}=0^{\circ}$) to the outlet (${\phi}=180^{\circ}$) by $10^{\circ}$ intervals of the duct are measured. The results obtained from the experiment are summarized as follows : wall shear stress values in the inner wall we larger than those in an outer wall, except for the phase angle (${\omega}t/{\pi}/6$) of 3, because of the intensity of secondary flow. The pressure distributions are the largest in accelerating and decelerating regions at the bend angle(${\phi}$) of $90^{\circ}$ and pressure difference of inner and outer walls is the largest before and after the ${\phi}=90^{\circ}$.
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분사펌프에 연결된 정사각 구동관로의 위치변화에 따른 유동특성
윤석주(Seok-Ju Yun),손현철(Hyun-Chull Sohn) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.2
A objective of this study is to identify the characteristics of mean velocity distribution through CFD analysis for various driven nozzle position changes. The analysis was done for different Reynolds number in entrance region of jet-pump and for several diameter ratios of driven nozzle. The largest absorption energy was found at the point s=1 in condition of diameter ratio 1:3.21 and point s=0.5 in condition of diameter ratio 1:2.25. The absorption energy was not related to the change of entrance velocity and the driven nozzle position having the largest absorption energy was function for cross section ratio. As the position of driven nozzle moves to the downstream, the absorption energy gets weaker. Because the energy from swirl was lost at the cross section gets smaller. As the position of driven nozzle moves to the downstream, the injection energy leans to the upper direction wall and as the Reynolds number increase, the lean phenomenon is more distinct. The flow quantity of driven nozzle, the diameter ratio 1:3.21, was 32% higher than that of 1 : 2.25 and as the inlet velocity gets faster the efficiency decreased. And as the cross section of the driven nozzle increases.
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LDV에 의한 정사각 단면 180° 곡덕트에서 난류진동유동의 유동특성
윤석주(Seok-Ju Yun),이행남(Haeng-Nam Lee),손현철(Hyun-Chull Sohn) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.7
In the present study the characteristics of turbulent oscillatory flows in a square-sectional 180°curved duct were investigated experimentally. A series of experiments for air flow were conducted to measure axial velocity profiles, secondary flow velocity profiles and pressure distributions. The measurements were made by a Laser Doppler Velocimeter (LDV) system with a data acquisition and processing system which includes Rotating Machinery Resolve (RMR) and PHASE software. The results from the experiment are summarized as follows. (1) The maximum velocity moved toward the outer wall from the region of a bend angle of 30°. The velocity distribution had a positive value extended over the total phase in the region of a bend angle of 150°. (2) Secondary flows were generally proportional to the velocity of the main flow. The intensity of the secondary flow was about 25% as much as that in the axial direction. (3) Pressure distributions were effects of the oscillatory Dean number and respective region.
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180˚ 곡관덕트에 연결된 직관덕트에서 층류정상 유동의 PIV계측에 의한 유동해석
박길문(Gil-moon Park),이행남(Haeng-nam Lee),손현철(Hyun-chull Sohn),이종구(Jong-gu Lee),이홍구(Hong-gu Lee),이덕구(Duct-gu Lee),윤완중(Wan-jung Yun) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The velocity vectors and kinetic energy of laminar steady flows in the exit region connected to the square-sectional 1800 curved duct investigated experimental by PIV measurements.<br/> The experimental study for air flows was conducted to measure velocity vectors and kinetic energy distributions by using the Particle Image Velocimetry (PIV) system with the data acquisition of cactus'2000 software.<br/> The results obtained from experimental studies arc summarized as follows :<br/> (1) The Velocity vector distributions in the entrance region was influenced by centrifugal force of the curved duct as the flow develops to downstream in the exit duct<br/> (2) The maximum kinetic energy of laminar steady flow was gradually increased as the Reynolds number (Re) increased.<br/> (3) The entrance length is correlated as ??=0.026 in developing laminar steady flows. The entrance length is a function of hydraulic diameter (D_h)and Reynolds number(Re).
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