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장춘만,이상문,전완호,임태균 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.6
This paper presents annual energy production (AEP) by a 1.5kW wind turbine due to be installedin Deokjeok-Do island. Local wind data is determined by geometric shape of Deokjeok-Do island and annual winddata from Korea Institute of Energy Research at three places considered to be installed the wind turbine. Numericalsimulation using WindSim is performed to obtain flow pattern for the whole island. The length of each computationgrid is 40 m, and k-e turbulence model is imposed. AEP is determined by the power curve of the wind turbineand the local wind data obtained from numerical simulation. To capture the more detailed flow pattern at thespecific local region, Urumsil-maul inside the island, fine mesh having the grid length of 10m is evaluated. Itis noted that the input data for numerical simulation to the local region is used the wind data obtained by thenumerical results for the whole island. From the numerical analysis, it is found that a local AEP at the Urumsil-maulhas almost same value of 1.72 MWh regardless the grid resolutions used in the present calculation. It is notedthat relatively fine mesh used for local region is effective to understand the flow pattern clearly.
단단 천음속 축류압축기 동익의 Stacking Line 설계 최적화
장춘만,Samad Abdus,김광용 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.6
Shape optimization of a rotor blade in a single-stage transonic axial compressor has been performed using a response surface method and three-dimensional Navier-Stokes analysis. Two shape variables of the rotor blade, which are used to define a blade skew, are introduced to increase an adiabatic efficiency. Throughout the shape optimization of a rotor blade, the adiabatic efficiency is increased to about 2.2 percent compared to that of the reference shape of the stator. The increase in efficiency for the optimal shape of the rotor is due to the pressure enhancement, which is mainly caused by moving the separation position on the suction surface of rotor blade to the downstream direction.1. 서 론* 한국건설기술연구원 화재설비연구부
Performance Enhancement of 20kW Regenerative Blower Using Design Parameters
장춘만,전현준 한국유체기계학회 2014 International journal of fluid machinery and syste Vol.7 No.3
This paper describes performance enhancement of a regenerative blower used for a 20 kW fuel cell system. Two design variables, bending angle of an impeller and blade thickness of an impeller tip, which are used to define an impeller shape, are introduced to enhance the blower performance. Internal flow of the regenerative blower has been analyzed with threedimensional Navier-Stokes equations to obtain the blower performance. General analysis code, CFX, is introduced in the present work. SST turbulence model is employed to estimate the eddy viscosity. Throughout the numerical analysis, it is found that the thickness of impeller tip is effective to increase the blower efficiency in the present blower. Pressure is successfully increased up to 2.8% compared to the reference blower at the design flow condition. And efficiency is also enhanced up to 2.98 % compared to the reference one. It is noted that low velocity region disturbs to make strong recirculation flow inside the blade passages, thus increases local pressure loss. Detailed flow field inside the regenerative blower is also analyzed and compared.