Pressure pulsations in piping system excited by a centrifugal turbomachinery taking the damping characteristics into consideration

I. Hayashi*, S. Kaneko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


Pressure pulsations excited by a centrifugal turbomachinery such as compressor, fan or pump at the blade passing frequency may cause severe noise and vibrations in piping system. Therefore, the practical evaluation method of pressure pulsations is strongly recommended. In particular, the maximum pressure amplitude under the resonant conditions should be appropriately evaluated. In this study, a one-dimensional excitation source model for a compressor or pump is introduced based on the equation of motion, so as to incorporate the non-linear damping proportional to velocity squared in the total piping system including the compressor or pump. The damping characteristics of the compressor or pump are investigated by using the semi-empirical model. It is shown that the resistance coefficient of the compressor or pump depends on the Reynolds number that is defined using the equivalent velocity of the pulsating flow. The frequency response of the pressure amplitude and the pressure distribution in the piping system can be evaluated by introducing the equivalent resistance of the compressor or pump and that of piping system. In particular, the relation of the maximum pressure amplitude in piping system to the location of the excitation source under resonant conditions can be evaluated. Finally, the reduction of the pressure pulsations by use of an orifice plate is discussed in terms of the pulsation energy loss.

Original languageEnglish
Pages (from-to)216-234
Number of pages19
JournalJournal of Fluids and Structures
Publication statusPublished - 2014 Feb
Externally publishedYes


  • Blade passing frequency
  • Centrifugal compressor
  • Centrifugal fan
  • Centrifugal pump
  • Damping
  • Pressure pulsation
  • Resonance

ASJC Scopus subject areas

  • Mechanical Engineering


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