Al-Swadi, Wissam K. Abbas (2017) Computational study of back pressure effect on nozzle ejector performance. Coursework Masters thesis, University of Southern Queensland. (Unpublished)
Abstract
The main aim of this dissertation is to investigate the effect of back pressure on the nozzle ejector performance via study the behaviour of gas flow through the 2D axisymmetric ejector. A computational fluid dynamic modelling has been applied by using the ANSYS FLUENT software 17.0 to detect the ejector performance when the back pressure is changed. The perfect gas has been adopted to estimate the ejector efficiency. The fluid's behaviour explained how the upstream and downstream of gas flow and their characteristics are changed when the back pressure has increased. The ejector performance is examined by using k- ε as a turbulent flow model. The performance of ejector has been calculated by considering several values of Back pressure (Bp) with three different conditions of inlet pressures, 2.7 bar, 3.5 bar, and 5 bar. 2.7 bar is selected as inlet pressure in the first time, to understand the flow properties when the back pressure is changed. The results show that the flow characteristics such as velocity, static temperature, Mach number, shockwave, static pressure, and turbulent kinetic energy are changed when the back pressure has increased. Furthermore, the effect of Bp concentrated on the diffuser section and the reverse flow occurs during the back pressure increase. Also, the study detects that the maximum value of entrainment ratio (ω) is obtained when the primary flow is 2.7, but the ejector fails rapidly compared with other conditions of inlet pressure, 3.5 bar, and 5 bar.
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| Item Type: | Thesis (Non-Research) (Coursework Masters) |
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| Item Status: | Live Archive |
| Additional Information: | Current UniSQ staff and students can request access to this thesis. Please email research.repository@unisq.edu.au with a subject line of SEAR thesis request and provide: Name of the thesis requested and Your name and UniSQ email address. |
| Faculty/School / Institute/Centre: | Current - Faculty of Health, Engineering and Sciences - No Department (1 Jul 2013 -) |
| Supervisors: | Saleh, Khalid |
| Qualification: | Master of Engineering Sciences (General Mechanical Engineering) |
| Date Deposited: | 16 Jul 2026 02:00 |
| Last Modified: | 16 Jul 2026 02:00 |
| Uncontrolled Keywords: | back pressure, nozzle ejector performance, 2D axisymmetric ejector, ANSYS-FLUENT software |
| URI: | https://sear.unisq.edu.au/id/eprint/53251 |
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