Obtaining the right pitch in turbomachinery blading is crucial to efficient and successful operations. Engineers adjust the rotor’s pitch angle to control the production or absorption of power. Even for low speed fans this is a promising tool. This paper focuses on the inception and the evolution of the flow instabilities in the tip region which drive the stall onset in low speed axial fans. The authors conducted an experimental study to investigate the inception patterns of rotating stall evolution at different rotor blade stagger-angle settings with the aim of speculating on stable operating margin. The authors drove the fan to stall at the design stagger-angle setting and then operated the variable pitch mechanism in order to recover the unstable operation. They measured pressure fluctuations in the tip region of the low-speed axial-flow fan fitted with a variable pitch in motion mechanism, with flush mounted probes. The authors studied the flow mechanisms for spike and modal stall inceptions in this low-speed axial-flow fan which showed relatively small tip clearance. The authors cross-correlated the pressure fluctuations and analyzed the cross-spectra in order to clarify blade pitch, end wall flow, and tip-leakage flow influences on stall inception during the transient at the rotor blades’ different stagger-angle settings. The authors observed a rotating instability near the maximum pressure-rise point at both design and low stagger-angle settings. The stall inception patterns were a spike type at the design stagger-angle setting as a result of the interaction between the incoming flow, tip-leakage flow and end wall backflow.
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April 2012
Research Papers
Stall Inception, Evolution and Control in a Low Speed Axial Fan With Variable Pitch in Motion
Stefano Bianchi,
Stefano Bianchi
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
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Alessandro Corsini,
Alessandro Corsini
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
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Luca Mazzucco,
Luca Mazzucco
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
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Lucilla Monteleone,
Lucilla Monteleone
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
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Anthony G. Sheard
Anthony G. Sheard
Fläkt Woods Limited
, Axial Way, Colchester, CO4 5AR UK
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Stefano Bianchi
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
Alessandro Corsini
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
Luca Mazzucco
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
Lucilla Monteleone
Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome
, Via Eudossiana, 18, I-00184 Rome, Italy
Anthony G. Sheard
Fläkt Woods Limited
, Axial Way, Colchester, CO4 5AR UK
J. Eng. Gas Turbines Power. Apr 2012, 134(4): 042602 (10 pages)
Published Online: January 30, 2012
Article history
Received:
May 16, 2011
Accepted:
May 20, 2011
Online:
January 30, 2012
Published:
January 30, 2012
Citation
Bianchi, S., Corsini, A., Mazzucco, L., Monteleone, L., and Sheard, A. G. (January 30, 2012). "Stall Inception, Evolution and Control in a Low Speed Axial Fan With Variable Pitch in Motion." ASME. J. Eng. Gas Turbines Power. April 2012; 134(4): 042602. https://doi.org/10.1115/1.4004726
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