Centrifugal Compressor Noise Reduction By Using Helmholtz Resonator Arrays.
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Centrifugal compressors used in the pipeline market generate very strong noise, which is typically dominated by the blade passing frequency and its higher harmonics. The high level of noise is not only very disturbing to the people living close to the installation site but can also potentially cause structural failures in the piping. A novel design of an acoustic Helmholtz array (AHA) has been developed to address this type of noise problem. Computational studies show that the installation of the AHA liner on the compressor diffuser walls is very effective in reducing the noise level of the compressor, especially the dominant blade passing frequency noise. The acoustic liner design has actually been built and tested. The data clearly show that the use of acoustic liners is indeed very effective in the reduction of compressor tonal noise. This effort compares the noise levels of a pipeline compressor with and without the acoustic liner of Helmholtz resonator arrays and quantifies the effectiveness of the liner in terms of decibel reduction. The effects of the liner on compressor aerodynamic performance are investigated and discussed.
Liu, Zheji; Hill, D. Lee (2001). Centrifugal Compressor Noise Reduction By Using Helmholtz Resonator Arrays.. Texas A&M University. Turbomachinery Laboratories. Available electronically from