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Numerical simulation on the opening delay of a discharge reed valve in compressors.

Number: pap. 1428

Author(s) : YOSHIZUMI F., KONDOH Y., MOROI T., et al.

Summary

The opening delay of a discharge reed valve for compressors caused by the stiction force of the oil film between the reed and the valve seat is investigated. The coupling simulation algorithm including models of cavitation in the oil film is developed. The two-dimensional oil film pressure distribution is obtained by solving numerically the Reynolds’ equation through the finite volume method. On the model of cavitation in the oil film, in addition to the case in which cavitation is not taken into account, two cavitation models are tested; the static cavitation model (Reynolds’ condition) in which the minimum oil pressure is set to absolute zero, and the dynamic cavitation model in which the oil film pressure can fall to the absolute negative (tensile in the liquid) due to the direct simulation of the bubble expansion. In order to check the validity, the numerical simulation is performed under a condition of a model experiment. Comparisons on the opening delay time between simulation results and the experimental result show that the static cavitation model gives the earlier delay time than that in the experiment, and the dynamic cavitation model which simulates the absolute negative pressure in the oil film reproduces quantitatively the experimental delay time. Based on the simulation result throught the dynamic cavitation model, the mechanism of the oil film rupture (valve opening) is discussed.

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Pages: 9 p.

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Details

  • Original title: Numerical simulation on the opening delay of a discharge reed valve in compressors.
  • Record ID : 30014252
  • Languages: English
  • Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
  • Publication date: 2014/07/14

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