Application of Vortex Control to an Automotive Transcritical R744 Ejector Cycle

Paper #:
  • 2018-01-0060

Published:
  • 2018-04-03
Abstract:
Expansion work recovery by two-phase ejector is known to be beneficial to vapor compression cycle performance. However, one of the biggest challenges with ejector vapor compression cycles is that the ejector cycle performance is sensitive to working condition changes which are common in automotive applications. Different working conditions require different ejector geometries to achieve maximum performance. Slightly different geometries may result in substantially different COPs under the same conditions. The ejector motive nozzle throat diameter (motive nozzle restrictiveness) is one of the key parameters that can significantly affect ejector cycle COP. This paper presents the experimental results of the application of a new two-phase nozzle restrictiveness control mechanism to an automotive transcritical R744 ejector cycle. This new control mechanism utilizes an adjustable swirl at the nozzle inlet to control the nozzle restrictiveness on the two-phase flow without changing the physical dimensions of the nozzle geometry. The test results show that nozzle restrictiveness can be adjusted with this new mechanism and ejector efficiency can be improved by the introduction of vortex.
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