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Technical Briefs

A Parametric Study of Reversible Jet-Fan Blades Aerodynamic Performance

[+] Author and Article Information
Kasra Daneshkhah

e-mail: kasra.daneshkhah@flaktwoods.com

A. G. Sheard

e-mail: geoff.sheard@flaktwoods.com
Fläkt Woods Limited,
Colchester, Essex, United Kingdom

Contributed by the Turbomachinery Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received August 27, 2012; final manuscript received September 13, 2012; published online January 10, 2013. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 135(2), 024503 (Jan 10, 2013) (4 pages) Paper No: GTP-12-1340; doi: 10.1115/1.4007758 History: Received August 27, 2012; Revised September 13, 2012

This paper presents a fully reversible blade parametric design methodology. The blades are for application in jet fans that ventilate and provide emergency smoke control in road tunnels. The blade design variables are tip solidity, twist, and camber distribution. The authors base the design methodology on a sensitivity analysis which they derived from a response surface approximation. They construct the latter using a computational analysis of four experimental cases which they generated using an experimental design approach. The sensitivity analysis calculates a rank and a weight for each design variable that affects the jet-fan performance parameters thrust and efficiency, and thus facilitates insight into each variable's relative importance. Finally, the authors present a redesign of an existing reversible jet-fan blade by following the design guidelines which they obtained from the sensitivity analysis. The authors study the aerodynamic characteristics of the redesigned blade and compare it to that of the baseline design configuration. They then manufacture a redesigned blade prototype. Finally, the authors present thrust and power measurements for both the baseline jet fan, and the baseline jet fan when fitted with a redesigned blade.

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References

Karki, K. C., and Patankar, S. V., 2000, “CFD Model for Jet-Fan Ventilation Systems,” Proceedings of the 10th International Symposium on Aerodynamics and Ventilation of Vehicle Tunnels Principles, Analysis and Design, Boston, November 1–3.
Mutama, K. R., and Hall, A. E., 1996, “The Experimental Investigation of Jet-Fan Aerodynamics Using Wind Tunnel Modeling,” ASME J. Fluids Eng., 118, pp. 322–328. [CrossRef]
Giesen, B. J. M., Penders, S. H. A., Loomans, M. G. L. C., Rutten, P. G. S., and Hensen, J. L. M., 2011, “Modeling and Simulation of a Jet-Fan for Controlled Airflow in Large Enclosures,” Environ. Model. Software, 26, pp. 191–200. [CrossRef]
Daneshkhah, K., and Ghaly, W. S., 2007, “Aerodynamic Inverse Design for Viscous Flow in Turbomachinery Blading,” AIAA J. Propul. Power, 23, pp. 814–820. [CrossRef]
Mengistu, T., and Ghaly, W. S., 2006, “Aerodynamic Optimization of Turbomachinery Blades Using Evolutionary Methods and ANN-Based Surrogate Models,” J. Opt. Eng., 9(3), pp. 239–255. [CrossRef]
Mengistu, T., Ghaly, W. S., and Manour, T, 2007, “Aerodynamic Shape Optimization of Turbine Blades Using a Design-Parameter-Based Shape Representation,” ASME Paper No. GT2007-28041. [CrossRef]
Lian, Y., and Liou, M., 2004, “Multi-Objective Optimization Using Coupled Response Surface Model and Evolutionary Algorithm,” AIAA Paper No. 2004-4323.
Mansour, T., and Ghaly, W. S., 2003, “An Implicit Geometric Representation of Turbine Blades Using NURBS,” Proceedings of the 11th CFD Conference of the Canadian Society of CFD, Vancouver, Canada, May 28–30, Vol. 1, pp. 238–243.
Beachkofski, B., and Grandhi, R., 2002, “Improved Distributed Hypercube Sampling,” AIAA Paper No. 2002-1274.
ANSYS CFX, Commercial Release, Version 12.1, Ansys Inc., Canonsburg, PA.

Figures

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Fig. 1

Fan performance chart in a fully ducted system predicted by CFD

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Fig. 2

Comparison of jet-fan CFD and test data: thrust (top); thrust efficiency (bottom)

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Fig. 3

Thrust and efficiency effect plots at 30 deg and 40 deg pitch angle

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Fig. 4

Comparison of the numerical and experimental performance characteristics: thrust (top); thrust efficiency (bottom)

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