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김동원(D.-W. Kim),이준화(J.-H. Lee),박성관(S.-K. Park),김윤제(Youn-J. Kim) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
A cross-flow fan is widely used on many industrial fields: a blower for the general industry, mining industry, automobile and home appliances. The design point of the cross-flow fan is generally chosen by based on the region within low static pressure and high flow rate. It relatively makes high dynamic pressure at low speed because a working fluid passes through an impeller blade twice. However, it has low static pressure efficiency between 30% and 40% because of relative high impact loss. Recently, in the air-conditioning systems, the operating behaviors at the off-design points are highly regarded to broaden the application area for various air-cooling loads. Especially, at the low flow rate, there exists a rapid pressure head reduction, a noise increase and an irregular flow against a rearguider as a scroll of centrifugal fan. Numerical analyses are carried out for cross-flow fan including the impeller, the rearguider and the stabilizer. Numerical domains are discretized by hexahedral cells. Three-dimensional, unsteady governing equations are solved using FVM, SIMPLE algorithm, sliding grid system and standard k-εturbulence model.
임펠러 출구각 및 리어가이더 형상 변화에 따른 횡류홴의 성능 특성
김형섭(K.-S. Kim),김동원(D.-W. Kim),윤태석(T-.S. Yoon),박성관(S.-K. Park),김윤제(Youn J. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A cross-flow 11m consists of an impeller, a stabilizer and a rearguidcer. whcn it applied for an air conditioner, an evaporator should be added. It relatively makes high dynamic pressure at low speed because a working fluid passes through an impeller blade twice and blades have a forward curved shape. Therefore, the performance of a cross-flow fan is influenced 25% by the impeller, 60% by the rearguider and the stabilizer, 15% by the heat exchanger. At the low flow rate, there are a rapid pressure head reduction, a noise increase and an unsteady 리ow against a stabilizer and a rearguider. Moreover, the reciprocal relation between the impeller and the flow passage is the important factor for performance improvement of the cross-flow fan because each parameter is independent. The performance characteristics in the cross-flow fan are graphically depicted with various impeller outlet angles and rearguiders.
임펠러 직경비 및 리어가이더 형상변화가 횡류홴 성능에 미치는 실험적 연구
김형섭(H.-S. Kim),김동원(D.-W. Kim),윤태석(T.-S. Yoon),박성관(S.-K. Park),김윤제(Youn J. Kim) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
A cross-flow fan relatively produces higher dynamic pressure at low speed because a working fluid passes through an impeller blade twice and blades have a forward curved shape. The performance of a cross-flow fan is influenced 25% by the impeller, 60% by the rearguider and the stabilizer, and 15% by the heat exchanger. At the low flow rate, there exist a rapid pressure head reduction, a noise increase and an unsteady flow against a stabilizer and a rearguider. The purpose of this study is to investigate the reciprocal relation among each parameter. Experiments are conducted to study the effects of a rearguider and a diameter ratio of impeller on the performance analysis of a cross-flow fan. Comparing with the rearguider of radial type, the Archimedes type shows excellent results for various diameter ratios.
스태빌라이져 위치 및 리어가이더 형상변화에 따른 횡류홴의 성능특성 연구
김동원,김형섭,윤태석,박성관,김윤제,Kim, D.W.,Kim, H.S.,Yoon, T.S.,Park, S.K.,Kim, Yon J. 한국유체기계학회 2004 한국유체기계학회 논문집 Vol.20 No.2
The design point of the cross-flow fan is generally based on the region within low static pressure and high flow rate. It relatively makes high dynamic pressure at low speed because a working fluid passes through an impeller blade twice. However, it has low static pressure efficiency between $30\%$ and $40\%$ because of relative high impact loss. The purpose of this study is to research the reciprocal relation among each parameter. Experiments and numerical analyses are conducted on effects of a stabilizer and a rearguider on performance analysis of a cross-flow fan. Two-dimensional, unsteady governing equations are solved using FVM, PISO algorithm, sliding grid system and standard $k-{\epsilon}$ turbulence model. Experiments are also carried out to estimate the performance of the modeled cross-flow fan. It is clarified that the rearguider of Archimedes type has excellent results for the most part.