Acousto-Elastic Interactions in High-Pressure CO2 Centrifugal Compressors

[+] Author and Article Information
Jithin Jith

Department of Applied Mechanics Indian Institute of Technology Madras Chennai, India 600 036

Sunetra Sarkar

Department of Aerospace Engineering Indian Institute of Technology Madras Chennai, India 600 036

1Corresponding author.

ASME doi:10.1115/1.4036931 History: Received March 15, 2017; Revised May 17, 2017


Accurate determination of acousto-elastic natural frequencies in centrifugal compressors is important in order to avoid resonance events that may lead to machine failure. Compressors operating with CO2 at high pressures, especially near its transition to supercritical state, deal with a wide variation in density and speed of sound. Natural frequency behaviour under these conditions is studied here. A finite element method based coupled acousto-elastic solver has been developed to study the modal coupling and interactions between the impeller and the side-cavity modes for an idealised compressor geometry. Pressure in the side-cavities is increased up to a very high value of 20 MPa and existence of fluid and structure dominant acousto-elastic modes is observed. The variation of the natural frequencies of these modes with pressure exhibits contrasting trends as CO2 transitions from gaseous to supercritical state.

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