A Non-synchronous Vibration of Moving Blades Coupled with the Bleed Chamber Resonance in an Axial Compressor

  • N. Yamaguchi
  • T. Sato
  • S. Umemura
  • T. Ohwaki
Conference paper

Abstract

In a low-speed model test of an axial compressor for a gas turbine, a new type of non-synchronous vibration of moving blades, which resonate at apparently non-integral orders of the machine rpm, was discovered and its cause was identified. The moving blades, which were located immediately upstream of a bleed slit and chamber, were excited by a flow oscillation through the slit due to the resonance or near-resonance of the air column within the bleed chamber, which, in turn, was excited by the rotor revolution. The resonance condition proved to be the following simple formula:
$$m{f_R} = \left| {{f_B} + {f_S}} \right|$$
where f R : rotor revolution frequency, f B : blade first bending frequency, f S : pressure fluctuation frequency of the bleed chamber resonance, and m: arbitrary integer.

Keywords

Reso Casing 

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Copyright information

© Springer-Verlag New York, Inc. 1993

Authors and Affiliations

  • N. Yamaguchi
    • 1
  • T. Sato
    • 1
  • S. Umemura
    • 1
  • T. Ohwaki
    • 1
  1. 1.Takasago R&D CenterMitsubishi Heavy Industries, Ltd.Takasago CityJapan

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