준3차원 설계법에 의한 고효율 사류팬 연구

장춘만(Choon-Man Jang),정용규(Yong-Gyu Jung),이동익(Dong-Ik Lee) 대한설비공학회 1995 대한설비공학회 학술발표대회논문집 Vol.1995 No.11

축류홴 익단누설와류의 수치적 해석

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.

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.

Excel을 이용한 원심송풍기 설계 프로그램 개발

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.

원심송풍기 구조해석에 의한 성능특성 연구

장춘만(Choon-Man Jang),최가람(Ka-Ram Choi),양상호(Sang-Ho Yang) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7

This paper describes structural characteristics of a centrifugal fan, which is mainly used for industrial plant. Structural analysis has been performed by finite element method using the results of pressure load obtained by computational fluid dynamics. The thickness distributions of impeller blade and plate are between 3.5 mm and 6 mm. Throughout the structural analysis of the fan, it is found that the positions of maximum stress and deformation are located at the junction of impeller blade and impeller plate and at the middle of impeller tip, respectively. Modal frequency is mainly affected by the thickness of impeller plate rather than impeller blade.

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.

볼류트 케이싱 형상에 따른 터보블로어 성능특성 고찰

장춘만(Choon-Man Jang),양상호(Sang-Ho Yang) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.9

본 연구에서는 생활폐기물 관로이송 설비에서 사용되고 있는 터보블로어의 성능향상을 목적으로 하며, 볼류트 케이싱의 확대반경과 폭에 따른 터보블로어의 성능특성을 삼차원 나비어-스톡스 방정식을 통한 수치해석과 실험적인 방법을 적용하여 분석하였다. 수치해석을 통한 압력과 효율특성은 실험값과 잘 일치함을 확인하였다. 수치해석을 이용한 볼류트 케이싱 형상특성 연구를 통하여, 터보블로어의 성능은 임펠러 익간 및 블로어 출구의 압력손실을 줄임으로써 개선됨을 확인하였다. 본 설계변수 분석을 통하여 효율은 약 3%, 압력은 약 2% 개선할 수 있었다. 또한 수치해석 결과를 이용하여 터보블로어의 내부유동장 특성을 비교, 분석하였다. This In this paper, we describe the performance characteristics of a turbo blower as a function of the shape of the volute casing: expansion diameter and width of the volute casing. The turbo blower considered in the present study is mainly used in a refuse collection system. The flow characteristics inside the turbo blower were analyzed by a three-dimensional Navier-Stokes solver and compared with experimental results. The distributions of pressure and efficiency obtained by numerical simulation were in good agreement with those determined experimentally. Throughout the numerical simulation of the turbo blower, the blower performance was enhanced by decreasing the local losses in the blade passage and the outlet flow. The efficiency and pressure for the design flow condition were enhanced by about 3% and 2%, respectively, compared to the efficiency and pressure of the reference blower. Detailed flow analysis was performed using the results of the numerical simulation.

원심송풍기 날개 수에 따른 압력특성 연구

장춘만(Choon-Man Jang),최가람(Ka-Ram Choi),김진혁(Jin-Hyuk Kim),차경훈(Kyung-Hun Cha),김광용(Kwang-Yong Kim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7

This paper describes the performance of centrifugal fan used for refuse collection system according to the number of splitters. To analyze the effect of blade numbers on fan performance, splitters installed between blades are introduced. The chord length of splitters is determined by 90 percent blade chord using the results of preliminary research. The fan performance is analyzed by three-dimensional Navier-Stokes analysis, and also compared to the results obtained by experiments. Throughout the experimental measurements and numerical simulation, fan performance can be increased by reducing the flow loss region mainly observed on the blade suction side. Pressure and efficiency are successfully increased by 3.6% and 4.4% compared to reference, respectively. Detailed flow pattern is also analyzed by the results of numerical simulation.

건물 연료전지용 재생블로어 설계변수 특성연구

장춘만(Choon-Man Jang),이종성(Jong-Sung Lee) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.10

This paper describes the blower performance used for single-stage high pressure regenerative blower. The blower considered is widely applied to the field of a fuel cell system, a medical equipment and a sewage treatment plant. Flow rate and rotating frequency of a impeller of the blower are considered as design parameters for the proper operation of the blower. Three-dimensional Navier-Stokes equations are introduced to analyze the performance and internal flow of the blower. Relatively good agreement between experimental measurements and numerical simulation is obtained. Throughout a numerical simulation, it is found that small and stable vortical flow generated inside the blade passage is effective to increase pressure and efficiency of the blower. Large local recirculation flow having low velocity in the blade passage obstructs the generation of stable vortical flow, thus increases the pressure loss of the blower. Detailed flow field inside the blower is also analyzed and discussed.

관로 시뮬레이터를 이용한 쓰레기 유동특성 연구

장춘만(Choon-Man Jang),최명덕(Myong-Duk Choi) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

Waste moving simulator is designed and manufactured to investigate the flow characteristics of waste inside a circular duct. The simulator consists of an air intake, a waste chute, straight and bended pipes, waste collector, turbo blower, and so on. The flow characteristics inside a circular pipe have been performed by experimental measurements and three-dimensional Navier-Stokes analysis. Throughout the numerical and experimental studies, pressure drop obtained by experiments in the circular pipe has a good agreement with that of numerical simulation. Unsteady behavior of the waste in the pipe is also analyzed by transient calculation. It is found that the period of injection time of a waste is very effective to determine the pressure loss in the waste moving simulator.