http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Choon-Man Jang(장춘만) (검색결과 141 건)
- 무료
- 기관 내 무료
- 유료
-
장춘만(Jang, Choon-Man),이종성(Lee, Jong-Sung) 한국신재생에너지학회 2012 신재생에너지 Vol.8 No.3
This paper describes unsteady internal flow characteristics of a cathode air blower, used for the 1 kW fuel cell system. The cathode air blower considered in the present study is a diaphragm type blower. To analyze the flow field inside the diaphragm cavity, compressible unsteady numerical simulation is performed. Moving mesh system is applied to the numerical analysis for describing the volume change of the diaphragm cavity in time. Throughout a numerical simulation by modeling the inlet and outlet valves in a diaphragm cavity, unsteady nature of an internal flow is successfully analyzed. Variations of mass flow rate, force and pressure on the lower moving plate of a diaphragm cavity are evaluated in time. The computed mass flow rate at the same pressure and rotating frequency of a motor has a maximum of 5 percent error with the experimental data. It is found that flow pattern at the suction process is more complex compared to that at the discharge process. Unsteady nature of internal flow in the cathode air blower is analyzed in detail.
-
수치해석에 의한 스플리터 부착 원심송풍기 성능특성 연구
장춘만(Choon Man Jang),최가람(Ka Ram Choi),양상호(Sang Ho Yang) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
본 연구에서는 생활폐기물 관로이송 설비에 사용되고 있는 원심송풍기의 성능향상을 위해 임펠러 날개 압력면과 부압면 측에 스플리터를 각각 설치하고, 스플리터의 코드길이 변화에 따른 성능특성을 삼차원 나비어-스톡스 방정식을 이용한 수치해석으로 분석하였다. 수치해석을 통한 기초연구를 바탕으로 날개 부압면측에서 발생하는 역류현상을 억제할 수 있는 스플리터의 익간설치를 고려하였으며, 주요설계 변수로는 코드길이를 설정하였다. 이를 통해 날개 부압면 측에 설치한 스플리터의 코드길이가 길어질수록 원심송풍기 압력 및 효율특성이 설계유량 조건 뿐만 아니라 유량증가에 따라 향상됨을 알 수 있었다. 설계유량 조건에서 스플리터 부착 원심송풍기에 의해 효율 및 압력은 기존대비 각각 4% 및 18% 향상되었다. This paper describes the performance of a centrifugal fan used for refuse collection systems according to the chord length of the splitters installed near the blade suction and pressure surface sides. The fan performance is analyzed by three-dimensional Navier?Stokes analysis and is compared to the results obtained experimentally. Throughout the numerical simulation of the fan with splitters, it is found that the reverse-flow region observed near the suction side of the blade can be reduced by installing a splitter. The fan performance is successfully improved by controlling the chord length of the splitter installed near the blade suction side. Under the designed flow condition, the efficiency and pressure of a fan with splitters increase by up to 4% and 18%, respectively, compared to the reference fan.
-
장춘만(Choon Man Jang),박준용(Jun Yong Park),양상호(Sang Ho Yang) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
This paper describes design procedure of a centrifugal blower using the program of Excel. Basic input variables for the impeller design are flow rates, rotating frequency of an impeller and pressure rise. Euler equation is introduced to determine design variables including a velocity triangle. The size of impeller and the number of impeller blade are determined by Cordier's correlation and slip factor of Stodola, respectively. In the design of a volute casing, a spiral equation having a exponential term is applied. Design program of a centrifugal blower using Excel has been constructed and tested for understanding the effect of design variables on the geometry of a blower.
-
5공 피토관 및 회전 열선 유속계에 의한 축류 홴 내부 유동장 계측 및 평가
장춘만,김광용,Jang, Choon-Man,Kim, Kwang-Yong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.12
This paper describes the flow measurements inside the blade passage of an axial flow fan by using a rotating hot-wire probe sensor from a relative flame of reference fixed to the rotor blades. The validity of fan rotor designed by a streamline curvature equation was performed by the measurement of the three-dimensional flow upstream and downstream of the fan rotor using a 5-hole pitot tube. The vortical flow structure near the rotor tip can be clearly observed by the measurements of a relative velocity and its fluctuation on quasi-orthogonal planes to a tip leakage vortex. Larger vortical flow, which results in higher blockage in the main flow, is formed according to decrease a flow rate. The vortical flow spreads out to the 30 percent span from the rotor tip at near stall condition. In the design operating condition, the tip leakage vortex is moved downstream while the center of the vortex keeps constant in the spanwise direction. Detailed characteristics of a velocity fluctuation with relation to the vortex were also analyzed.
-
수치해석을 이용한 쓰레기 관로이송 시스템의 압력손실 평가
장춘만(Choon-Man Jang),이상윤(Sang-Yun Lee),서상호(Sang-Ho Suh),오윤택(Youn-Taek Oh) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper describes flow characteristics inside a circular pipe of waste collection piping system. The flow characteristics are analyzed by three-dimensional Navier-Stokes analysis. In numerical analysis, organic waste is modeled using the data obtained by site survey. Throughout the numerical simulation, pressure drop in a waste pipe is obtained and compared to the value obtained by analytical method. The pressure drop obtained by numerical simulation of the organic waste has a good agreement with that of the analytic method. It is noted that the accurate prediction of pressure drop in the waste pipe is very important to determine the performance of turbo blower used in making a suction pressure in the waste pipe. Detailed flow characteristics inside the waste pipe having a diverse geometry are also analyzed and discussed.
-
장춘만(Choon-Man Jang),김광용(Kwang-Yong Kim) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Three-dimensional vortical flow and separated flow topology near the casing wall in an axial flow fan having two different tip clearances have been investigated by a Reynolds-averaged Navier-Stokes (RANS) flow simulation. The simulation shows that the tip leakage vortex formed close to the leading edge of the blade tip on suction side grows in the streamwise direction. On the casing wall, a separation line is formed upstream of the leakage vortex center due to the interference between the leakage vortex and main flow. The reverse flow is observed between the separation line and the attachment line generated downstream of the trailing edge, and increased with enlarging tip clearance. The patterns of a leakage velocity vector including a leakage flow rate are also analyzed according to two tip clearances. It is noted that the understanding of the distribution of a limiting streamline on the casing wall is very important to grasp the characteristics of the vortical flow in the axial flow fan.
-
-
장춘만(Choon-Man Jang),Abdus Samad,김광용(Kwang-Yong Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Shape optimization of a transonic axial compressor rotor operating at the design flow condition has been performed using three-dimensional Navier-Stokes analysis and three different surrogate models: i.e.., Response Surface Method(RSM), Kriging Method, and Radial Basis Function(RBF). Three design variables of blade sweep, lean and skew are introduced to optimize the three-dimensional stacking line of the rotor blade. The object function of the shape optimization is selected as an adiabatic efficiency. Throughout the shape optimization of the rotor blade, the adiabatic efficiency is increased for the three different surrogate models. Detailed flow characteristics at the optimal blade shape obtained by different optimization method are drawn and discussed.
-
-
DBpia
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
