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Experimental and numerical investigations of ejector jet refrigeration system with primary stream swirl.

Number: pap. 2045

Author(s) : JIAUTHEEN P. B., JAWALI MAHARUDRAPPA M., ANNAMALAI M.

Summary

Among the various heat powered refrigeration systems, vapour jet refrigeration system (VJRS) is attractive because of its simple and rugged nature. Ejector is a key component in VJRS and the performance of the whole system depends on the effective performance of the ejector, which in-turn could be improved by proper mixing of primary and secondary streams. This paper focuses on numerical and experimental studies of air ejector to analyse the influence of swirl on the performance of the system. Three-dimensional numerical analysis has been carried out for the ejector with and with no-swirl and the same has been verified with experimental studies using flow visualisation technique, particle image velocimetry (PIV). Swirl is generated in the primary stream by incorporating fixed vane swirler of camber angle of 10°, just upstream of the convergent portion of the primary nozzle which is a convergentdivergent (CD) nozzle. Velocity vectors obtained from PIV and CFD were compared and found that the results fall within an acceptable range. Studies have been carried out for an ejector under various primary stream pressures, with secondary and discharge pressure being open to atmosphere. By incorporating swirler of Type-2, in the primary nozzle, it has been observed that, swirl induced is low to have a significant improvement in entrainment ratio (around 2%) of ejector whereas swirler of Type-1 resulted in 5% improvement in performance compared to ejector with no-swirl.

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Pages: 10

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Details

  • Original title: Experimental and numerical investigations of ejector jet refrigeration system with primary stream swirl.
  • Record ID : 30018834
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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