Numerical Simulation Research on Effect of Unsteady Inter-row Interaction on Flutter Characteristics of Downstream Rotor in Counter-rotating Fan

doi:10.3901/JME.2020.21.149

Abstract

Abstract: In order to investigate the influence of the inter-row interaction on the flutter characteristics of downstream rotor in a two-stage counter-rotating fan, the harmonic balance method is used to simulate the unsteady flow of the oscillating blades in the multi-row environment. Through the energy method for flutter prediction, the difference of the unsteady pressure response and the aerodynamic work done on the blades is investigated using two different multi-row models. And the influencing mechanism of upstream disturbance on aeroelastic stability of downstream rotors under counter-rotating structure is discussed. The results show that the aerodynamic damping of the downstream rotor decreases due to the aerodynamic interaction. The main reason for the difference of flutter characteristics is not only the change of shock wave state in time-averaged flow field caused by unsteady disturbance between rows, but also the periodic fluctuation of inlet flow angle for downstream rotor caused by the upstream wake propagation.

Key words: counter-rotating fan, harmonic balance method, unsteady flow, inter-row interaction, flutter

CLC Number:

TG156

LI Degang, ZHANG Xiang. Numerical Simulation Research on Effect of Unsteady Inter-row Interaction on Flutter Characteristics of Downstream Rotor in Counter-rotating Fan[J]. Journal of Mechanical Engineering, 2020, 56(21): 149-157.

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