Aeroelastic stability analysis of rotor blade under multi-row environment

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (1) : 146-152.

YANG Hui, LI Zhenpeng

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Abstract

Conventional blade flutter analysis is normally based on an isolated blade row model, the influence of multi-row aerodynamic coupling on blade flutter characteristics cant be ignored when rotor-stator gaps decrease due to aeroengine compact requirements. A fluidstructure coupled simulation for a 1.5stage HPC was conducted with a selfdeveloped algorithm to analyze the influence of upstream and downstream blade rows on rotor blade flutter characteristics. Aiming at a typical operation condition, rotor blades aeroelastic stability analyses were performed with an isolated rotor model, an IGV-rotor model, a rotorstator one and an IGV-rotorstator one, respectively. The results showed that the shock wave vibration influences the flutter stability significantly; there are reflection and superposition of unsteady pressure waves under the multirow environment, the amplitude and phase of unsteady pressures on the rotor blade surface are changed obviously and furthermore the blade aeroelastic stability is changed; multirow interferences raise the aerodynamic damping of rotor blade, especially, when the upstream and downstream blade rows act simultaneously, the damping value increases by nearly 732.7%.

Key words

blade flutter;full-Annulus /Multi-Row;fluid-structure interaction;aerodynamic damping / pressure wave

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YANG Hui, LI Zhenpeng. Aeroelastic stability analysis of rotor blade under multi-row environment[J]. Journal of Vibration and Shock, 2017, 36(1): 146-152

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