This study assesses the effectiveness of modified blade-tip configurations in achieving passive noise control in industrial fans. The concepts developed here, which are based on the addition of end-plates at the fan-blade tip, are shown to have a beneficial effect on the fan aeroacoustic signature as a result of the changes they induce in tip-leakage-flow behavior. The aerodynamic merits of the proposed blade-tip concepts are investigated by experimental and computational studies in a fully ducted configuration. The flow mechanisms in the blade-tip region are correlated with the specific end-plate design features, and their role in the creation of overall acoustic emissions is clarified. The tip-leakage flows of the fans are analyzed in terms of vortex structure, chordwise leakage flow, and loading distribution. Rotor losses are also investigated. The modifications to blade-tip geometry are found to have marked effects on the multiple vortex behaviors of leakage flow as a result of changes in the near-wall fluid flow paths on both blade surfaces. The improvements in rotor efficiency are assessed and correlated with the control of tip-leakage flows produced by the modified tip end-plates.
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August 2009
Research Papers
Aerodynamic Performance of Blade Tip End-Plates Designed for Low-Noise Operation in Axial Flow Fans
Alessandro Corsini,
Alessandro Corsini
Dipartimento di Meccanica e Aeronautica,
“Sapienza” University of Rome
, Via Eudossiana 18, I00184 Rome, Italy
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Franco Rispoli,
Franco Rispoli
Dipartimento di Meccanica e Aeronautica,
“Sapienza” University of Rome
, Via Eudossiana 18, I00184 Rome, Italy
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A. G. Sheard
A. G. Sheard
Fläkt Woods Limited
, Axial Way, Colchester CO4 5AR, UK
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Alessandro Corsini
Dipartimento di Meccanica e Aeronautica,
“Sapienza” University of Rome
, Via Eudossiana 18, I00184 Rome, Italy
Franco Rispoli
Dipartimento di Meccanica e Aeronautica,
“Sapienza” University of Rome
, Via Eudossiana 18, I00184 Rome, Italy
A. G. Sheard
Fläkt Woods Limited
, Axial Way, Colchester CO4 5AR, UKJ. Fluids Eng. Aug 2009, 131(8): 081101 (13 pages)
Published Online: July 7, 2009
Article history
Received:
July 25, 2007
Revised:
October 3, 2008
Published:
July 7, 2009
Citation
Corsini, A., Rispoli, F., and Sheard, A. G. (July 7, 2009). "Aerodynamic Performance of Blade Tip End-Plates Designed for Low-Noise Operation in Axial Flow Fans." ASME. J. Fluids Eng. August 2009; 131(8): 081101. https://doi.org/10.1115/1.3026723
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