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Empirical calculation method for bypass leakage in scroll compressors.

Number: pap.1499

Author(s) : ISHII N., TSUJI T., NONOGUCHI E., et al.

Summary

This study presents a new idea for an empirical method to calculate the bypass leakage mass flow rate along the tip seal in scroll compressors. A bypass leakage test model was precisely developed to be compatible with a practical scroll compressor with large cooling capacity. Detailed tests of pressure decay in a pressurized vessel due to the bypass leakages were conducted with dry refrigerant gas R410A. The measured pressure decay characteristics were subsequently simulated using the Darcy-Weisbach equation with an empirical friction factor determined in our previous study for the leakage flow through axial clearances. In the present simulations of the measured pressure decay, the complicated flow patterns through bypass clearances were decomposed into two thin representative rectangular cross-section leakage passes, one with the effective mean width and another with the effective mean length. Empirical values of the equivalent pass width and length were determined so that the measured pressure
decays are well predicted by the calculations. As a result, the bypass leakage flow rate along the tip seal in scroll compressors can be calculated by a very simple scheme introducing the equivalent pass width of one representative leakage pass with a thin rectangular cross-section.

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Pages: 10 p.

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Details

  • Original title: Empirical calculation method for bypass leakage in scroll compressors.
  • Record ID : 30019459
  • Languages: English
  • Source: 2016 Purdue Conferences. 23rd International Compressor Engineering Conference at Purdue.
  • Publication date: 2016/07/11

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