A rotor blisk of a supersonic space turbine has previously been designed to allow for free flutter to occur in an air test rig [1]. Flutter occurred at several operating conditions and the flutter boundary for the test turbine was established. In this paper the rotor blisk is redesigned in order to inhibit flutter. The design strategy chosen is to introduce a mistuning concept. Based on aeroelastic analyses using a reduced order model (ROM) a criterion for the required level of mistuning is established in order to stabilize the lower system modes. Proposals in literature suggest and analyze mistuning by varying blade mode frequencies in random patterns or by modifying blades in an odd-even pattern. Here a modification of sectors of the blisk is introduced in order to bring a sufficient split of the system mode frequencies. To verify that the redesigned blisk efficiently could inhibit flutter an experiment similar to that in [1] is performed with the mistuned rotor blisk. By running the redesigned blisk at operating conditions deep in to the unstable region of the tuned blisk it is demonstrated that a relative low level of mistuning is sufficient to eliminate rotor flutter.
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ASME Turbo Expo 2008: Power for Land, Sea, and Air
June 9–13, 2008
Berlin, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4315-4
PROCEEDINGS PAPER
Design and Experimental Verification of Mistuning of a Supersonic Turbine Blisk
Pieter Groth,
Pieter Groth
Volvo Aero Corporation, Trolha¨ttan, Sweden
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Hans Ma˚rtensson,
Hans Ma˚rtensson
Volvo Aero Corporation, Trolha¨ttan, Sweden
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Clas Andersson
Clas Andersson
Volvo Aero Corporation, Trolha¨ttan, Sweden
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Pieter Groth
Volvo Aero Corporation, Trolha¨ttan, Sweden
Hans Ma˚rtensson
Volvo Aero Corporation, Trolha¨ttan, Sweden
Clas Andersson
Volvo Aero Corporation, Trolha¨ttan, Sweden
Paper No:
GT2008-50677, pp. 759-768; 10 pages
Published Online:
August 3, 2009
Citation
Groth, P, Ma˚rtensson, H, & Andersson, C. "Design and Experimental Verification of Mistuning of a Supersonic Turbine Blisk." Proceedings of the ASME Turbo Expo 2008: Power for Land, Sea, and Air. Volume 5: Structures and Dynamics, Parts A and B. Berlin, Germany. June 9–13, 2008. pp. 759-768. ASME. https://doi.org/10.1115/GT2008-50677
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