Influence of Nozzle Divergent Part Length and Throat Diameter on Vortex Control of Initially Subcooled Flashing Flow

Paper #:
  • 2017-01-0165

Published:
  • 2017-03-28
DOI:
  • 10.4271/2017-01-0165
Citation:
Zhu, J. and Elbel, S., "Influence of Nozzle Divergent Part Length and Throat Diameter on Vortex Control of Initially Subcooled Flashing Flow," SAE Int. J. Passeng. Cars - Mech. Syst. 10(1):121-127, 2017, doi:10.4271/2017-01-0165.
Pages:
7
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 cycle is that the ejector cycle performance is sensitive to working condition changes which are common in many applications, including automotive AC systems. Different working conditions require different ejector geometries to achieve maximum performance. Slightly different geometries may result in substantially different COPs under the same conditions. Ejector motive nozzle throat diameter (motive nozzle restrictiveness) is one of the key parameters that can significantly affect COP. This paper presents the experimental investigation of a new motive nozzle restrictiveness control mechanism for two-phase ejectors used in vapor compression cycles, which has the advantages of being simple, potentially less costly and less vulnerable to clogging. The redesigned ejector utilizes an adjustable vortex at the motive inlet to control the nozzle restrictiveness on the flow expanded in the motive nozzle. Adjustable nozzles based on this new control mechanism were designed and manufactured for experiments with R134a. The influence of nozzle divergent part length and throat diameter on the vortex control of initially subcooled flashing flow is presented. Visualization results of the two-phase flow inside the nozzle are also provided.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2016-07-01
Technical Paper / Journal Article
2007-04-16
Training / Education
2011-04-20
Technical Paper / Journal Article
2005-09-07
Technical Paper / Journal Article
2007-11-28
Technical Paper / Journal Article
2004-01-16
Technical Paper / Journal Article
2008-04-14