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Analyse numérique de l'écoulement transitoire d'un fluide compressible le jeu piston-cylindre d'un compresseur linéaire sans huile. 

Numerical analysis of the transient compressible fluid flow in the piston-cylinder clearance of an oil-free linear compressor.

Numéro : 0371

Auteurs : SANTOS C. J., DUTRA T., DESCHAMPS C. J.

Résumé

Oil-free linear compressors adopt aerostatic bearings to avoid metal contact between the piston and cylinder. Despite the small friction in the bearing, the gas flow in the piston-cylinder clearance can generate losses that decrease the compressor efficiency. The present paper reports a model developed to evaluate such losses and their effects on the volumetric and isentropic efficiencies. The transient compressible fluid flow in the gap is simulated with a commercial code based on the finite volume method, whereas the compression cycle in the cylinder is solved with an in-house code using a lumped model formulation. The model was employed to assess the compressor performance as a function of four parameters: compressor speed, piston oscillation amplitude, pressure ratio and radial clearance, It was found that the compressor efficiency is mainly reduced when the clearance dimension and pressure ratio are increased.

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Format PDF

Pages : 8

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Numerical analysis of the transient compressible fluid flow in the piston-cylinder clearance of an oil-free linear compressor.
  • Identifiant de la fiche : 30028223
  • Langues : Anglais
  • Source : 10th IIR Conference on Compressors and Refrigerants.
  • Date d'édition : 13/01/2021
  • DOI : http://dx.doi.org/10.18462/iir.compr.2021.0371
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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