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Vane back-pressure of vane type compressors and its mathematical model.

Author(s) : FUKUTA M., YANAGISAWA T., IJIRI M., et al.

Type of article: Article

Summary

Vane type compressors pressurize a back-pressure chamber of the vane to maintain contact between a vane tip and a stator wall. It is important to apply appropriate pressure to the back-pressure chamber in order to prevent excessive friction at the vane tip or the chattering phenomenon. However, the determination of the pressure is so complicated that it has been designed empirically or experimentally. In this study, the back pressure is measured by visualizing a plate groove to which the back pressure chamber is connected. The plate groove is filled with a mixture of oil and refrigerant gas, and the void fraction in it increases with the rotational speed. The back pressure decreases with increasing rotational speed and the influence of the discharge pressure on the back pressure is larger than that of the suction pressure. It is found that leakage through the rotor face is one of the dominant factors and this can be modelled by using the time averaged pressure distribution on the rotor circumference. The results calculated using the mathematical model developed in this study agree well with the experimental results under several conditions.

Details

  • Original title: Vane back-pressure of vane type compressors and its mathematical model.
  • Record ID : 2004-2201
  • Languages: English
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 20 - n. 3
  • Publication date: 2003

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