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Thermoacoustical effects in a cylindrical regenerator filled with a stack of beads.

Effets thermoacoustiques dans un régénérateur cylindrique contenant un empilement de billes.

Author(s) : NIKA P., FEIDT M., FRANCOIS M. X., et al.

Type of article: Article, IJR article

Summary

Linear thermoacoustic theory is applied to study the regenerator of a Stirling machine or a pulsed gas refrigerator regenerator filled with a stack of beds in a cylindrical envelope. Pressure, velocity and temperature amplitude are calculated, and a formulation of the thermal time constant of the regenerator is proposed. A global equivalent electrical scheme of the regenerator is also deduced. The total axial energy flux expression is demonstrated and the influence of the thermal time constant and of the various impedance is discussed. Axial variations of the energy flux, which correspond to thermal exchanges with the surroundings are expressed through consideration of thermoacoustical phenomena: thermal relaxation of the acoustical energy, viscous losses, thermoacoustical source/sink. Theoretical results are analysed to comment on temperature profiles along the regenerator in a periodical regime.

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Pages: 150-164

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Details

  • Original title: Effets thermoacoustiques dans un régénérateur cylindrique contenant un empilement de billes.
  • Record ID : 2004-1099
  • Languages: French
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 2
  • Publication date: 2004/03

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