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Aeroelastic responses of spring-suspended airfoil systems in transonic buffeting flows

Publication ,  Journal Article
Raveh, DE; Dowell, EH
Published in: 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012
December 1, 2012

Computer simulations are performed to determine the responses of a single DOF pitch airfoil system, as well as those of a two DOF pitch-and-heave system, in buffeting flows. The buffeting flow exhibits shock-wave oscillations of a unique frequency that occurs for some combinations of mean flow angle of attack and transonic Mach numbers. It was found that frequency lock-in may occur, depending on the relationship between the buffet and structural frequencies. Following frequency lock-in the system response rapidly increases until reaching limit-cycle oscillations. Synchronization of the transonic aerodynamic buffet phenomenon and the structural elastic modes provides a physical mechanism that may be responsible for some aircraft transonic LCO occurrences. It is distinctly different from a flutter mechanism, leading to LCO, as discussed in the manuscript. © 2012 by D.E. Raveh and E.H. Dowell.

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Published In

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012

Publication Date

December 1, 2012
 

Citation

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Raveh, D. E., & Dowell, E. H. (2012). Aeroelastic responses of spring-suspended airfoil systems in transonic buffeting flows. 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012.
Raveh, D. E., and E. H. Dowell. “Aeroelastic responses of spring-suspended airfoil systems in transonic buffeting flows.” 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012, December 1, 2012.
Raveh DE, Dowell EH. Aeroelastic responses of spring-suspended airfoil systems in transonic buffeting flows. 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012. 2012 Dec 1;
Raveh, D. E., and E. H. Dowell. “Aeroelastic responses of spring-suspended airfoil systems in transonic buffeting flows.” 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012, Dec. 2012.
Raveh DE, Dowell EH. Aeroelastic responses of spring-suspended airfoil systems in transonic buffeting flows. 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012. 2012 Dec 1;

Published In

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012

Publication Date

December 1, 2012