Authors:
Chan Lee
1
;
Jimin Choi
1
;
Jiseok Hwang
1
;
Hyeongjin Lee
2
;
Sangyeol Lee
3
and
Sang Yang
3
Affiliations:
1
Department of Mechanical Engineering, University of Suwon, 17 Wauangil, Hwaseong, Republic of Korea
;
2
PIDOTEC, 05854, A-309 MSTATE, 114 Beobwon-ro, Songpa-gu, Seoul, Republic of Korea
;
3
Samwon E&B, 233 Jeongwangchun-ro, Shiheung, Republic of Korea
Keyword(s):
Axial Flow Fan, Blade Design, CFD (Computational Fluid Dynamics), Efficiency, Optimization, Through-Flow Analysis.
Abstract:
In order to develop a variable-pitch axial fan, an optimal three-dimensional fan blade is designed by using the 2-stage design optimization strategy to combine aerodynamic fan design program, CFD technique, and optimization algorithm. At the 1 st stage of fan design optimization, the aerodynamic fan design program of this study is the FANDAS code where the chord length, setting angle, and camber angle of the fan blade are considered as design variables, and the performance, efficiency, and power of the fan are predicted by applying the through-flow analysis method to the designed fan. By applying a optimization algorithm to the FANDAS program, a three-dimensional fan blade shape is optimized and constructed for maximizing fan efficiency. At the 2 nd stage of fan design optimization, CFD analysis method is also applied on the optimized fan from the first design optimization study, and additional design optimization for the blade setting angles is conducted by applying an optimization
algorithm to the CFD model and simulation results. Furthermore the total pressure, efficiency, and power characteristic curves of the fan according to the variable-pitch operation conditions are calculated by applying the CFD technique to the final optimal fan model obtained through the 2-stage design optimization processes. From the CFD results on the characteristic curves of optimal fan, it is found that the optimal fan model of this study shows the highest efficiency of 91% at the design point, maintains high efficiency level of 80% in a wide flow range through variable-pitch operation.
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