NUMERICAL INVESTIGATION AND EXPERIMENTAL VALIDATION OF PRIMARY FLOW NOZZLE OF AN EJECTOR SYSTEM

Date

2023-9-5

Author

Emerce, Beril

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Ejector-Diffuser system is one of the pragmatic methods to convert high-pressure energy into kinetic energy, which is used to entrain the low-pressure flow. Because of its many advantages, the ejector is a preferable system for different applications. The main objective of the ejector system is mixing primary and secondary flow. The mixing process is a complicated concept directly affecting performance. In this thesis study, the effects of the primary flow nozzle on mixing and ejector performance are investigated. To increase mixing efficiency, the chevron nozzle is selected as a primary flow nozzle and studied numerically and experimentally. In this study, a chevron nozzle is examined to observe the effect on performance by comparing it with a circular nozzle. CFD analyses are performed with ANSYS Fluent for different mass flow rates and mixing duct lengths. In the experiment process, a chevron is also tested at different mass flow rates and mixing duct length to validate the numerical results. It is expected to increase the vacuum effect due to chevron influence, and it causes a decrease in test chamber pressure. The comparison is performed with a circular nozzle to understand the impact on the ejector-diffuser system.

Subject Keywords

Primary Flow Nozzle, Mixing Efficiency, Ejector-Diffuser System, Vacuum Capacity, Entrainment Ratio

URI

https://hdl.handle.net/11511/105507

Collections

Graduate School of Natural and Applied Sciences, Thesis