Aerodynamic Shape Optimization Of
Axial Flow Fan Nose Cones
Author(s)
R. W. Derksen & J. R. Bender
Abstract
The purpose of this work is to improve the efficiency of large scale axial flow
fans through the introduction of a more uniform velocity distribution over the fan
blades. This improved velocity distribution being realized through the use of an
aerodynamically optimized inlet cone. The procedure for optimizing the inlet
cone uses existing aerodynamic optimization methods programmed into a
completely self contained FORTRAN program. The type of optimization
algorithm used here is the use of design optimization to solve an inverse design
problem. The different modules of the program include a surface vorticity panel
method flow solver, a Bezier curve surface definition routine and a minimization
method. Three different minimization methods were tested to determine the most
appropriate one, this being the downhill simplex method in multidimensions.
Many different sized fans and inlet cones were tested, with two different types of
optimized inlet cones being discovered. Short inlet cones typically make use of a
very blunt inlet cone with a slight hump or rise above the hub radius. Longer
inlet cones make use of a more curved inlet cone with no hump. It was also
found from this work that the relatively simple methods used can provide an
adequate modeling of the problem and a reasonable solution.
Keywords: axial flow fans, aerodynamic shape optimization, inverse design.
Keywords
axial flow fans, aerodynamic shape optimization, inverse design.
Related Book
Other papers in this volume
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