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Model development and numerical procedure for detailed ejector analysis and design.

Author(s) : OUZZANE M., AIDOUN Z.

Type of article: Article

Summary

The main purpose of this work was to develop a mathematical model and computer programmes for ejector studies in refrigeration cycles. Version A of the programme was written for optimal ejector design while Version B, with more built-in flexibility, was intended for simulation. The study was a one-dimensional analysis of compressible refrigerant flow, based on a forward marching technique of solution for the conservation equations. The approach assessed the flow locally and provided the flexibility of returning upstream for correcting adjustments. Model validation against the R141b data of Huang et al. showed very good agreement under all conditions. Analysis with refrigerant R142b was performed for typical refrigeration conditions. The entrainment ratio omega, the compression ratio P6/P2 and geometric parameters such as diameters and axial dimensions were used to assess performance. Local distributions of pressure, temperature and Mach number were obtained for typical conditions and the mixing chamber was found to greatly impact operation and performance, by controlling the shock wave occurrence and intensity.

Details

  • Original title: Model development and numerical procedure for detailed ejector analysis and design.
  • Record ID : 2004-2241
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 23 - n. 18
  • Publication date: 2003/12

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