Date of Award

1-1-2019

Publication Type

Master Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

Keywords

Ejector, Experimental, Fluid, Jet Numerical, Synthetic

Supervisor

Gary Rankin

Supervisor

Vesselina Roussinova

Rights

info:eu-repo/semantics/openAccess

Abstract

A traditional synthetic jet ejector is a combination of synthetic jet and mixing tube or shroud in which flow from the surroundings is entrained through the space between the jet and shroud and discharged from the end of a mixing tube. An objective of the current research is to evaluate the accuracy of a previous simplified numerical model using results from an improved numerical model and an experimental synthetic jet ejector water flow facility. The improved model gives a better representation of the primary jet velocity profile by accurately modeling the piston motion using the dynamic mesh option. Also, flow approaching the secondary inlet plane is considered in the new model by including the surrounding fluid in the solution domain. The model is used to show the shortcomings of certain assumptions made in the simplified model.

Experimentally, the phase-averaged velocity field within the shroud is determined using Particle Image Velocimetry. It is shown that the improved numerical model gives a more accurate prediction of the variation of phase-averaged volume flow rate throughout the cycle and the cycle averaged values than the previous simplified model. Also, the numerical and phase-averaged experimental flow field patterns show some similarities however, certain details of the profiles are quite different. Extremely high turbulence level or intense mixing is detected near the exit of the synthetic jet. This is thought to be responsible for the shorter flow development noticed in the experiments compared with the numerical solution.

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