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Visual investigation on effect of structural parameters and operation condition of two-phase ejector.

Number: pap. 2155

Author(s) : DENG J., ZHANG Y., HE Y., et al.

Summary

Based on shadowgraph technique, a visual research for an ejector in transcritical CO2 refrigeration cycle has been conducted. The mixing process and the changes of the flow structure in suction chamber was recorded. A visualization test platform with rectangular ejector was builted to collect experiment data about the performance of ejector. And images of mixing process under different mixing cross-sectional area(A) and length of the divergent section of the motive nozzle also collected. The images displayed that there existed two symmetrically premixed vortexes insuction chamber in the mixing process of primary flow and secondary flow. With the increase of primary flow pressure, the diameters of these premixed vortexes become larger, and the location of premixed vortexes also trend from the exit to the entrance of the suction chamber. Particularly, the length of divergent section of the motive nozzle and the cross-sectional area(A) of mixing section had significant effect on the merging of primary flow and secondary flow. Moreover, too long or short length of the divergent section of the motive nozzle and too small mixing cross-sectional area(A)made the location of premixed vortexes obviously trend from the exit to the entrance of the suction chamber, and the mixing flow of these two flows would not be homogeneous for this condition, which would result in the deterioration of the performance of the ejector. Finally, some special phenomenons in the observing experiment was depicted.

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Pages: 9 p.

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Details

  • Original title: Visual investigation on effect of structural parameters and operation condition of two-phase ejector.
  • Record ID : 30018783
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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