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Two-phase simulations on transient flow in scroll compressor using VOF method.

Number: 1379

Author(s) : KIM J., CHO Y., LEE J., PARK H.

Summary

In operating scroll compressors, lubrication oil is in general injected between the moving parts, to cool the working gas or to reduce the gaps between them. However, it is challenging to analyze the two-phase flow in a scroll compressor due to the complicated structure including narrow gaps. We conducted three-dimensional two-phase numerical simulations in the transient flow field in a scroll compressor using R32 as a working fluid and POE85 as a lubricating oil. Oil and refrigerant were modeled using the Volume of Fluid (VOF) method. The refrigerant property tables were generated from REFPROP and during calculation, each thermodynamic property of the refrigerant was interpolated using UDRGM (User-Defined Real Gas Model), thereby reducing the computational time. Bypass valves were included in the scroll compressor geometry and the mesh update during the valve motion occurred using the layering method. Additionally, the deformation of chamber part geometry was simulated using Structured Dynamic Mesh (SDM) method. By implementing these approaches, we could maintain high grid quality and a sufficient number of mesh including the flank gap region. In this paper, we investigated the influence of the oil on the compression performance and local flow field. In the presence of valve motions, a modest reduction in discharge temperature was observed, accompanied by the increase in mass flow rate.

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  • Original title: Two-phase simulations on transient flow in scroll compressor using VOF method.
  • Record ID : 30033611
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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