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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2015, Vol. 36 ›› Issue (3): 737-748.doi: 10.7527/S1000-6893.2015.0029

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Investigation of sound generation by non-synchronously vibrating rotor blades

ZHOU Di1, WANG Xiaoyu1,2, CHEN Jun1, HONG Zhiliang1, SUN Xiaofeng1,2   

  1. 1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;
    2. Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191, China
  • Received:2014-12-02 Revised:2015-01-21 Online:2015-03-15 Published:2015-03-31
  • Supported by:

    National Basic Research Program of China (2012CB720201); National Natural Science Foundation of China (51106005)

Abstract:

The blade fatigue failure is a common aeroelastic problem of axial compressor. The phenomenon accompanied with blade vibration is abnormal acoustic field generation in compressor duct. The frequency of sound field generated by non-synchronously vibrating rotor blades is unequal not only to the compressor rotational frequency, but also to the blade passing frequency that is identical with sound generated by stator and rotor interaction. Meanwhile the frequency cannot be explained by typical Doppler shift phenomenon. In this paper, a theoretical model based on the three-dimensional lifting surface theory has been built to demonstrate the frequency and circumferential modal characteristics of the sound generated by rotor blades vibration. The developed model illuminates the fact that the sound frequency and circumferential mode depend a lot on the inter-blade phase angle. The experiment results verify the relationship between sound generation and blades vibration given by the model.

Key words: compressor noise, rotor blades vibration, inter-blade phase angle, unsteady aerodynamic force on rotor blades, three-dimensional lifting surface theory

CLC Number: