Effect of Fan Blade Vibration Mode on Flutter Stability

Jia, Xinkai; Huang, Huang; Wang, Dingxi

doi:10.33737/gpps21-tc-182

Cited by 1 publication

(1 citation statement)

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“…This critical frequency for flutter can surpass the downstream cut-on frequency if the 1F mode shape has a large twist-to-plunge ratio. Interested readers can refer to our thorough analyses through a mode shape decomposition procedure [28].…”

Section: Flutter Mechanismsmentioning

confidence: 99%

Uncovering the Root Causes of Stall Flutter in a Wide Chord Fan Blisk

Huang

Yang

Wang

2022

IJTPP

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Flutter was encountered at part speeds in a scaled wide chord fan blisk designed for a civil aeroengine during a rig test when the fan bypass flow was throttled toward its stall boundary. Analysis of the blade tip timing measurement data revealed that the fan blades vibrated at the first flap (1F) mode with nodal diameters of two and three. To facilitate a further rig test and ultimately eliminate the flutter problem, a numerical campaign was launched to help understand the root causes of the flutter. Both the influence coefficient method (ICM) and the traveling wave method (TWM) were employed in the numerical investigation to analyze unsteady flows due to blade vibration, with the intention to corroborate different numerical results and take advantage of each method. To eliminate nonphysical reflections, a sponge layer with an inflated mesh size was used for the extended inlet and outlet regions. Steady flow field and unsteady flow field were examined to relate them to the blade flutter. The influences of vibration frequency, mass flow rate, shock, boundary layer separation and acoustic mode propagation behaviors on the fan flutter stability were also investigated. Particular attention was paid to the acoustic mode propagation behaviors.

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Section: Flutter Mechanismsmentioning

confidence: 99%