This paper describes a detailed wide-chord fan blade flutter analysis with emphasis on flutter bite. The same fan was used with three different intakes of increasing complexity to explain flutter mechanisms. Two types of flutter, namely, stall and acoustic flutters, were identified. The first intake is a uniform cylinder, in which there are no acoustic reflections. Only the stall flutter, which is driven by flow separation, can exist in this case. The second intake, based on the first one, has a “bump” feature to reflect the fan’s forward pressure wave at a known location so that detailed parametric studies can be undertaken. The analysis revealed a mechanism for acoustic flutter, which is driven by the phase of the reflected wave. The third intake has the typical geometric features of a flight intake. The results indicate that flutter bite occurs when both stall and acoustic flutters happen at the same speed. It is also found that blade stiffening has no effect on aero-acoustic flutter.
Skip Nav Destination
Article navigation
October 2011
Research Papers
Mechanisms for Wide-Chord Fan Blade Flutter
George Simpson,
George Simpson
Rolls-Royce PLC
, P.O. Box 31, Derby DE24 8BJ, UK
Search for other works by this author on:
Mehmet Imregun
Mehmet Imregun
Imperial College London MED
, Exhibition Road, London SW7 2AZ, UK
Search for other works by this author on:
Mehdi Vahdati
George Simpson
Rolls-Royce PLC
, P.O. Box 31, Derby DE24 8BJ, UK
Mehmet Imregun
Imperial College London MED
, Exhibition Road, London SW7 2AZ, UKJ. Turbomach. Oct 2011, 133(4): 041029 (7 pages)
Published Online: April 27, 2011
Article history
Received:
August 19, 2009
Revised:
October 28, 2009
Online:
April 27, 2011
Published:
April 27, 2011
Citation
Vahdati, M., Simpson, G., and Imregun, M. (April 27, 2011). "Mechanisms for Wide-Chord Fan Blade Flutter." ASME. J. Turbomach. October 2011; 133(4): 041029. https://doi.org/10.1115/1.4001233
Download citation file:
Get Email Alerts
Related Articles
Web-Based, Interactive Laboratory Experiment in Turbomachine Aerodynamics
J. Turbomach (January,2010)
Aerodynamic Asymmetry Analysis of Unsteady Flows in Turbomachinery
J. Turbomach (January,2010)
The Application of an Aerodynamic Shroud for Axial Ventilation Fans
J. Fluids Eng (June,2007)
Far-Field Radiation of Tip Aerodynamic Sound Sources in Axial Fans
Fitted With Passive Noise Control Features
J. Vib. Acoust (October,2011)
Related Proceedings Papers
Related Chapters
Applications
Introduction to Finite Element, Boundary Element, and Meshless Methods: With Applications to Heat Transfer and Fluid Flow
Natural Gas Transmission
Pipeline Design & Construction: A Practical Approach, Third Edition
Control and Operational Performance
Closed-Cycle Gas Turbines: Operating Experience and Future Potential