Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 22, Issue 10, Pages 1864-1869Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-008-0724-y
Keywords
Axial flow fan; Design optimization; Navier-stokes equations; Stacking line; Lean; Maximum blade thickness; Response surface method
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Funding
- National Research Foundation of Korea [과C6A1806] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This work presents a numerical optimization procedure for a low-speed axial flow fan blade with polynomial response Surface approximation model. Reynolds-averaged Navier-Stokes equations with SST turbulence model are discretized by finite volume approximations and solved on hexahedral grids for flow analyses. The blade profile as well as stacking line is modified to enhance blade total efficiency, i.e., the objective function. The design variables of blade lean, maximum thickness and location of maximum thickness are selected, and a design of experiments technique produces design points where flow analyses are performed to obtain values of the objective function. A gradient-based search algorithm is used to find the optimal design in the design space from the constructed response surface model for the objective Function. As a main result, the efficiency is increased effectively by the present optimization procedure. And, it is also shown that the modification of blade lean is more effective to improve the efficiency rather than modifying blade profile.
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