Share

Improved equivalent simple model of complicated bypass leakages in scroll compressors.

Number: pap. 1708

Author(s) : ANAMI K., ISHII N., TSUJI T., et al.

Summary

This study presents an improved simple equivalent model to calculate the bypass leakage mass flow rate along the tip seal in scroll compressors, where the complicated flow patterns through bypass clearances were decomposed into two thin representative rectangular cross-section leakage passes. The one is for the leakage along the tip seal and has the rectangular cross-section of the effective mean width by the thrust clearance height over the scroll wrap in front of the tip seal, where the pass length was represented by the equivalent leakage length, theoretically derived from the simple Darcy-Weisbach equation. The other is for the tangential leakage over the scroll wrap, through the minimum rectangular cross-section in front of the tip seal, and the pass length was represented by the effective mean length. The effective mean width and length were empirically determined with simple bypass leakage tests, where the pressure decay in a pressurized vessel with dry refrigerant gas R410A, due to the bypass leakages, were measured. 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. Empirical values of the effective pass width and length were determined so that the measured pressure decays are well predicted by the calculations. Furthermore the effective pass width and length were reduced to a non-dimensional form and the physical meanings represented by the empirical values were examined, and finally the leakage flow velocities and leakage flow rates were presented.

Available documents

Format PDF

Pages: 10

Available

  • Public price

    20 €

  • Member price*

    15 €

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Improved equivalent simple model of complicated bypass leakages in scroll compressors.
  • Record ID : 30024395
  • Languages: English
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

Links


See other articles from the proceedings (130)
See the conference proceedings

Indexing