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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

Wright, T., 1996, “Low Pressure Axial Fans,” Handbook of Fluid Dynamics and Fluid Machinery. - 3: Applications of Fluid Dynamics, J. A. Schetz and A. E. Fuhs, eds., Wiley, Chichester, pp. 2340–2356.
Wallis, R. A., 1961, Axial Flow Fans. Design and Practice, George Newnes Limited, London.
Wallis,  R. A., 1968, “Optimisation of Axial Flow Fan Design,” Mechanical and Chemical Engineering Transactions, The Institution of Engineers, Australia, MC4, No. 1, pp. 31–37.
Dugao,  Z., Jiang,  Z., and Song,  J., 1996, “Optimization Design of an Axial Flow-Fan Used for Mining Local-Ventilation,” Comput. Ind. Eng., 31, No. 3, pp. 691–696.
Bolton, A. N., 1990, “Installation Effects in Fan Systems,” Proceedings of the Institution of Mechanical Engineers, Part A 204, pp. 201–215.
So̸rensen,  D. N., and So̸rensen,  J. N., 2000, “Toward Improved Rotor-Only Axial Fans—Part I: A Numerically Efficient Aerodynamic Model for Arbitrary Vortex Flow,” ASME J. Fluids Eng., 122, No. 2, pp. 318–323.
Kahane, A., 1948, “Investigation of Axial-Flow Fan and Compressor Rotors Designed for Three-Dimensional Flow,” Tech. Note 1652, NACA, Langley Memorial Aeronautical Laboratory, Langley Field, Va.
Press, W. H., Teukolsky, S. A., Vetterling, W. T., and Flannery, B. P., 1992, Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed., Cambridge University Press, p. 128.
Emery,  J. C., Herrig,  L. J., Erwin,  J. R., and Felix,  A. R., 1958, “Systematic Two-Dimensional Cascade Tests of NACA 65-Series Compressor Blades at Low Speeds,” Report TR-1368, NACA, Langley Aeronautical Laboratory, Langley Field, Va.
Squire,  H. B., 1960, “Analysis of the vortex breakdown phenomenon. Part I,” Report 102, Imperial College of Science and Technology, Aeronautics Department.
Sharland,  I. J., 1964, “Sources of Noise in Axial Flow Fans,” J. Sound Vib., 1, No. 3, pp. 302–322.
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Powell, M. J. D., 1978, “A Fast Algorithm for Nonlinearly Constrained Optimization Calculations,” Lecture Notes in Mathematics, G. A. Watson, ed., Vol. 630, pp. 144–157.

Figures

Grahic Jump Location
Definition of the spanwise variables chord (c), stagger (ξ), and camber (θ), used in the optimization
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
Optimum spanwise distributions of chord (top), stagger angle (center), and camber angle (bottom) for three different widths of the design interval
Grahic Jump Location
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).
Grahic Jump Location
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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