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Original title:
Problematics of aerodynamic damping calculation from measured data of 5-blade cascade
Authors: Šnábl, Pavel ; Pešek, Luděk ; Prasad, Chandra Shekhar ; Chindada, Sony
Document type: Papers
Conference/Event: Conference on COMPUTATIONAL MECHANICS 2022 (CM 2022) /37./, Srní (CZ), 20221107
Year: 2022
Language: eng
Abstract: Aerodynamic damping as a function of inter-blade phase angle (IBPA), so called S-curve, is crucial for assessment of aeroelastic stability of blade cascades, e.g. turbines, compressors, etc.\nFor constructing the S-curve, the motion-induced controlled flutter is introduced to the bladesof the cascade. As decribed in [1], two testing methods exist: aerodynamic influence coefficient\n(AIC) approach and travelling wave mode (TWM) approach. In TWM approach, all blades in a row oscillate with the same frequency and amplitude with various IBPAs. The response is\nmeasured only on the reference blade. With this approach, several measurements with different IPBAs are needed to construct the S-curve. On the other hand, AIC uses single oscillating\nblade and principle of linear superimposition of aerodynamic influence responses measured on all blades in a cascade. The result of one single measurement can be used for estimation of\naerodynamic damping for any IBPA. In the past year a new 5-blade cascade with rotating symmetrical NACA 0010 profiles was designed and built. The blades of the cascade were placed further apart and thus we are now able to reach stall flutter. Also, the suspension of the blades and sensors were significantly improved. Now, our goal is to evaluate S-curves using AIC approach for different flow conditions and oscillation frequencies.
Keywords: aerodynamic damping; blade cascade; S-curve
Project no.: GA20-26779S (CEP)
Funding provider: GA ČR
Host item entry: COMPUTATIONAL MECHANICS 2022, ISBN 978-80-261-1116-0
Note: Související webová stránka: https://www.kme.zcu.cz/compmech/download/proceedings/CM2022_Conference_Proceedings.pdf#section*.45
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0340717
Permalink: http://www.nusl.cz/ntk/nusl-521608
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Šnábl, Pavel ; Pešek, Luděk ; Prasad, Chandra Shekhar ; Chindada, Sony
Document type: Papers
Conference/Event: Conference on COMPUTATIONAL MECHANICS 2022 (CM 2022) /37./, Srní (CZ), 20221107
Year: 2022
Language: eng
Abstract: Aerodynamic damping as a function of inter-blade phase angle (IBPA), so called S-curve, is crucial for assessment of aeroelastic stability of blade cascades, e.g. turbines, compressors, etc.\nFor constructing the S-curve, the motion-induced controlled flutter is introduced to the bladesof the cascade. As decribed in [1], two testing methods exist: aerodynamic influence coefficient\n(AIC) approach and travelling wave mode (TWM) approach. In TWM approach, all blades in a row oscillate with the same frequency and amplitude with various IBPAs. The response is\nmeasured only on the reference blade. With this approach, several measurements with different IPBAs are needed to construct the S-curve. On the other hand, AIC uses single oscillating\nblade and principle of linear superimposition of aerodynamic influence responses measured on all blades in a cascade. The result of one single measurement can be used for estimation of\naerodynamic damping for any IBPA. In the past year a new 5-blade cascade with rotating symmetrical NACA 0010 profiles was designed and built. The blades of the cascade were placed further apart and thus we are now able to reach stall flutter. Also, the suspension of the blades and sensors were significantly improved. Now, our goal is to evaluate S-curves using AIC approach for different flow conditions and oscillation frequencies.
Keywords: aerodynamic damping; blade cascade; S-curve
Project no.: GA20-26779S (CEP)
Funding provider: GA ČR
Host item entry: COMPUTATIONAL MECHANICS 2022, ISBN 978-80-261-1116-0
Note: Související webová stránka: https://www.kme.zcu.cz/compmech/download/proceedings/CM2022_Conference_Proceedings.pdf#section*.45
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0340717
Permalink: http://www.nusl.cz/ntk/nusl-521608
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2023-03-12, last modified 2023-12-06