Influence of geometrical factors on steam ejector performance – A numerical assessment |
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| Authors: | Szabolcs Varga Armando C Oliveira Bogdan Diaconu |
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| Affiliation: | 1. Air Conditioning and Refrigeration Center, Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801, USA;2. Creative Thermal Solutions, Inc., 2209 North Willow Road, Urbana, IL 61802, USA;1. School of Control Science and Engineering, Shandong University, Shandong 250061, PR China;2. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Sichuan 621010, PR China |
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| Abstract: | A number of factors influence the performance of an ejector. In this work, three geometrical factors – the area ratio between the nozzle and constant area section (rA), nozzle exit position (NXP) and constant area section length (Lm) – were considered. The theoretical analysis was carried out by a CFD model of a steam ejector using FLUENT. The results indicated the existence of an optimal area ratio, depending on operating conditions. Therefore, a new feature, a spindle in the primary nozzle is suggested to fine tune the primary flow rate depending on operating conditions. The location of NXP influenced both entrainment ratio (λ) and critical back pressure (pc,crit), showing an optimum at 60 mm from the inlet plane of the ejector mixing section. Lm had little influence on λ; however, longer constant area sections resulted in higher pc,crit. For an optimal design, a value of Lm = 155 mm was identified. |
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