Pseudo-3D Computational Fluid Dynamic and Equivalent Circuit Models of a Supersonic Fluidic Oscillator for a Superplastic Forming Process

Date of Award

1-31-2023

Publication Type

Dissertation

Degree Name

Ph.D.

Department

Mechanical, Automotive, and Materials Engineering

Keywords

CFD, Experiment, Fluid mechanics, Fluidic, Gas dynamics, Supersonic Flow

Supervisor

G.Rankin

Supervisor

N.Kar

Rights

info:eu-repo/semantics/embargoedAccess

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

The unique challenge of developing a bi-stable load-type fluidic oscillator to satisfy the requirement of high output power for potential implementation in industrial processes such as the superplastic forming process is addressed in this dissertation. The fluid dynamic mechanisms involved in the operation of such a fluidic device are investigated with two experimental prototypes of a load-type supersonic fluidic oscillator (SFO). The experimental data is used in conjunction with computational fluid dynamic (CFD) models to provide more details of the fluid motion and operation of the device. A simple and robust Pseudo-3D approach for improving the accuracy of two-dimensional CFD solutions for this problem is presented. Based on the knowledge from the CFD modelling, a novel equivalent fluid circuit model is developed to be capable of quickly and accurately predicting the performance of a load-type SFO. The transient solution of the model equations is shown to give good quantitative agreement with previous experimental values of the oscillation frequency and amplitude. Aided by the CFD and equivalent circuit studies, the working mechanism of the two prototypes is identified. The usefulness and robustness of the simplified circuit approach are also demonstrated by showing the ease with which parameter and design changes can be investigated.

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