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김동원(D.-W. Kim),이준화(J.-H. Lee),박성관(S.-K. Park),김윤제(Youn J. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
A cross-flow fan is widely used on many industrial fields: mining industry, automobile and home<br/> appliances, etc. The design point of the cross-flow fan is generally based on the region within low static<br/> pressure and high flow rate. It relatively makes high dynamic pressure at low speed because a working fluid<br/> passes through an impeller blade twice. However, it has low static pressure efficiency between 30% and 40%<br/> because of relative high impact loss. Recently, in the air-conditioning systems, the operating behaviors at the<br/> off-design points are highly regarded to broaden the application area for various air-cooling loads. Especially,<br/> at the lower flow rate, there exists a rapid pressure head reduction, a noise increase and an irregular flow field<br/> against a rearguider as a scroll of centrifugal fan. Numerical analyses are carried out for investigating the flow<br/> characteristics in a cross-flow fan including the impeller, the rearguider and the stabilizer. Especially, various<br/> types of rearguiders are estimated by numerical and experimental methods to insure the stable operation in the<br/> region of lower flow rate. Numerical domains are discretized by hexahedral cells. Three-dimensional,<br/> unsteady governing equations are solved using FVM, PISO algorithm, sliding grid system and standard k - ..<br/> turbulence model. ASHRAE standard fan tester is also used to estimate the performance of the modeled crossflow<br/> fan.
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.