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TECHNICAL PAPERS

Toward Improved Rotor-Only Axial Fans—Part II: Design Optimization for Maximum Efficiency

[+] Author and Article Information
D. N. So̸rensen, J. N. So̸rensen

Department of Energy Engineering, Technical University of Denmark, DK2800 Lyngby, Denmark

M. C. Thompson

Department of Mechanical Engineering, Monash University, Clayton, Vic. 3168, Australia

J. Fluids Eng 122(2), 324-329 (Jan 21, 2000) (6 pages) doi:10.1115/1.483260 History: Received October 21, 1997; Revised January 21, 2000
Copyright © 2000 by ASME
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References

Figures

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Definition of the spanwise variables chord (c), stagger (ξ), and camber (θ), used in the optimization
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Optimum efficiency as a function of design interval width, Qc=6 m3/s. The stall limit constraint is active for ΔQ≥1.4 m3/s, and the tangential velocity limit constraint is active for ΔQ≥1.8 m3/s.
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Tangential to axial velocity ratio at fan outlet for the optimum designs for three different widths of the design interval. The curves are for the lowest flow rate in the design interval. The constraint on the tangential velocity was Vθ2/Vx2≤1.1.
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Optimum spanwise distributions of chord (top), stagger angle (center), and camber angle (bottom) for three different widths of the design interval
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Radial distributions of tangential velocity (top), axial velocity (center) and total pressure rise (bottom) for three different widths of the design interval. The curves are calculated at the flow rate of the design interval center (Qc=6.0 m3/s).
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Optimum efficiency as a function of hub radius. Qc=6 m3/s,ΔQ=2 m3/s. Filled symbols show the optimum hub radius, i.e., when the hub radius is included as a design variable. Arrows indicate when the tangential velocity limit constraint becomes active.

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