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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (9): 521018-521018.doi: 10.7527/S1000-6893.2017.621018

• Special Column of Internal Flow and Heat Transfer Technology Development in Aero-engine • Previous Articles     Next Articles

Characteristics analysis of forced vibration response of mistuned cascades

ZHANG Weiwei1, GAO Yiqi1, QUAN Jinlou2, SU Dan1   

  1. 1. National Key Laboratory of Aerodynamic Design and Research, Northwestern Polytechnical University, Xi'an 710072, China;
    2. AECC Sichuan Gas Turbine Establishment, Chengdu 610500, China
  • Received:2016-12-05 Revised:2017-02-26 Online:2017-09-15 Published:2017-03-20
  • Supported by:

    National Natural Science Foundation of China (11172237)

Abstract:

This paper employs a reduced order aerodynamic model based on Computational Fluid Dynamics (CFD), coupled with the structural dynamic equation, to analyze the forced vibration response of the mistuned cascade. The displacement amplitude of the typical transonic cascade in the tuned and mistuned cases are calculated by the proposed method, and the effect of mistuning patterns, mistuning strengths and mass ratios on the forced vibration response amplitude of the mistuned cascade are investigated quantitatively. The results show that the stiffness mistuning patterns in this paper can improve the stability of the cascade, but can also result in the increase of the modal localized level. The maximum vibration amplitude magnification factor has a peak value as the mistuning strength increases or the mass ratio decreases, and the peak value is significantly affected by mistuning patterns. Due to its efficiency in the analysis of the modal localization of the mistuned cascade with forced vibration, the proposed method is beneficial for engineering applications.

Key words: computational fluid dynamics (CFD), reduced order model (ROM), fluid-structrual coupling, mistuning, forced response

CLC Number: