Supersonic Steam Ejectors: Comparison of Dry and Wet-steam CFD Simulation Models

Article

Al-Manea, Ahmed and Saleh, Khalid. 2022. "Supersonic Steam Ejectors: Comparison of Dry and Wet-steam CFD Simulation Models." Journal of Engineering Science and Technology. 17 (2), pp. 1200-1212.
Article Title

Supersonic Steam Ejectors: Comparison of Dry and Wet-steam CFD Simulation Models

ERA Journal ID41798
Article CategoryArticle
AuthorsAl-Manea, Ahmed (Author) and Saleh, Khalid (Author)
Journal TitleJournal of Engineering Science and Technology
Journal Citation17 (2), pp. 1200-1212
Number of Pages13
Year2022
Place of PublicationMalaysia
ISSN1823-4690
Web Address (URL)https://jestec.taylors.edu.my/V17Issue2.htm
Abstract

Ejectors are used in different vacuums applications. However, they have low efficiency at the current time. Due to a lack of understanding of the ejector mixing process. This paper focuses on using Computational Fluid Dynamic (CFD) to understand the effect of condensation on the flow characterization after nozzle exit position. This was achieved by modelling a variable ejector geometry with two approaches: Ideal gas, and Wet-Steam models. The simulation outcomes for both cases show that the condensation process that occurs with the primary nozzle, led to change the static pressure and temperature magnitudes in comparison to the case without the condensation. The static temperature profile at NTP shows an increase within the static temperature in the Wet-Steam case with differences of approximately 180 K. In addition, the differences of static pressure after NTP for the two cases was approximately 1 K.

KeywordsCFD; Ideal gas model; Steam ejector; Supersonic flow; Wet-steam model
ANZSRC Field of Research 2020401204. Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)
400199. Aerospace engineering not elsewhere classified
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Byline AffiliationsAl-Furat Al-Awsat Technical University, Iraq
School of Mechanical and Electrical Engineering
Institution of OriginUniversity of Southern Queensland
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