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장춘만(Choon-Man Jang) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
This paper describes flow characteristics in a piping system having various duct shapes on refuse collecting system. A simulator for the refuse collecting system is designed to analyze the flow characteristics in the piping system. The simulator consists of an air intake, a waste chute, circular duct having various shapes. cyclone and turbo blower. The simulator has four different duct shapes: straight, curved, inclined and Y-shaped ducts. Three-dimensional Navier-Stokes analysis is introduced to analyze the pressure loss in the piping system. Throughout the numerical simulation, pressure loss obtained by numerical simulation has a good agreement with the results of experimental measurements. The proper length of the curved and Y-ducts to make database for pressure loss is determined by evaluating the pressure and flow analysis. Flow and pressure characteristics in the piping system of the simulator is evaluated by numerical simulation and discussed in detail.
장춘만(Choon-Man Jang),양상호(Sang-Ho Yang) 한국유체기계학회 2010 유체기계 연구개발 발표회 논문집 Vol.2010 No.12
This paper describes the shape optimization of a blower impeller used for a refuse collection system Two design variables, which are used to define the blade angles of an impeller, are introduced to increase the blower performance. A blower efficiency is selected as an object function, and the shape optimization of the blade angles is performed by a response surface method (RSM). Three-dimensional Navier-Stokes equations are introduced to analyze the internal flow of the blower and to find the value of object function for the training data, Relatively good agreement between experimental measurements and numerical simulation is obtained in the present study. Throughout the shape optimization, blower efficiency for the optimal blade angles is successfully increased up to 3.6% compared with that of reference at the design flow rate Detailed flow field inside the turbo blower is also analyzed and discussed.
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.
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.
장춘만(Choon-Man Jang),이기상(Ki-Sang Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper describes flow characteristics around the electrostatic precipitator (EP), prefilter and screen. The flow inside bypass tunnel is very complex due to the complicated tunnel geometry. Two types of bypass tunnel, single-path and double-path, are introduced in the present study. The velocity distributions at a screen and downstream of EP are measured by hot-wire sensor and compared to those obtained by numerical simulation. The velocity distributions obtained by experiments have a good agreement with those of the numerical simulations. The distorted flow distributions are found at the inlet region of the bypass tunnel, thus results in non-uniform inflow on the EP. Non-uniform inflow on the EP deteriorates the performance of EP. In design of the shape of bypass tunnel, it is noted that the preliminary calculation is necessary to make uniform inflow upstream of EP.
도로터널용 전기집진기 통과유속 균일화에 대한 최적화 연구
장춘만(Choon-Man Jang),이기상(Ki-Sang Lee),김광용(Kwang-Yong Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper describes flow uniformity around the electrostatic precipitator (EP) installed in the bypass tunnel of road tunnel. Flow uniformity is an important parameter to enhance the efficiency of electrostatic precipitator. In the present study, EP system having a single-pass is considered and optimized for flow uniformity downstream of the EP. Optimization of EP system has been performed using response surface method and three-dimensional Navier-Stokes analysis. Two design variables, the distance between a inertia filter and a EP and the open area of inertia filter, are introduced. Throughout the flow optimization of the EP system inside the bypass tunnel, optimal distance between the inertia filter and the EP for making uniform flow downstream of the EP is found.