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

Number: 0371

Author(s) : SANTOS C. J., DUTRA T., DESCHAMPS C. J.

Summary

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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Pages: 8

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Details

  • Original title: Numerical analysis of the transient compressible fluid flow in the piston-cylinder clearance of an oil-free linear compressor.
  • Record ID : 30028223
  • Languages: English
  • Source: 10th IIR Conference on Compressors and Refrigerants.
  • Publication date: 2021/01/13
  • DOI: http://dx.doi.org/10.18462/iir.compr.2021.0371
  • Document available for consultation in the library of the IIR headquarters only.

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