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Identification of the resonant frequencies with the use of generalized transfer matrix for the nozzle-type element: comparison of the CFD-based and analytical methods.

Number: pap. 1377

Author(s) : MLYNARCZYK P.

Summary

Pressure pulsations caused by volumetric machines are still an important problem in the compressors, pumps and diesel engines manifolds and pipelines operation. Nowadays, the problem is much more significant - for example in the refrigeration industry, where the variable revolution speed compressors are widely introduced. The classical Helmholtz resonators can attenuate the pulsations only in a narrow range of frequencies. One of the possibility to attenuate the pressure pulsations is to introduce the shaped nozzles into the compressor outflow and inflow pipelines. It is a problem to introduce transfer matrix of the nozzle with variable geometry to the classical Helmholtz model to analyze it influence on the whole system. In the past several identification methods were presented but some of them are too complicated for practical applications. Such a method must be reliable, easy and can’t be time-consuming. Two methods described in the literature meet all these conditions: the CFD-based identification method and analytical extension to the transfer matrix method. In this paper the identification of the generalized transfer matrix comparison for the nozzle-type geometry is presented. Such a comparison will allow to answer the question whether these methods are mutually exclusive, confirm or complementary. This paper also present conclusions about the calculations time and difficulty level.

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Pages: 7

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Details

  • Original title: Identification of the resonant frequencies with the use of generalized transfer matrix for the nozzle-type element: comparison of the CFD-based and analytical methods.
  • Record ID : 30024330
  • Languages: English
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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