Internal Fluid Dynamics and Frequency Characteristics of Feedback-Free Fluidic Oscillators

In this work, the internal fluid dynamics and frequency characteristics of feedback-free fluidic oscillators are investigated experimentally and numerically. The internal flow field of various scale oscillators was extracted using a refractive index-matched Particle Image Velocimetry (PIV) technique with the help of a PIV phase averaging method and a new sensor setup for simultaneous frequency measurements in refractive index matching fluid. Three different operating regimes (low flow rate, transition and high flow rate regions) and the fluid dynamics of the oscillating behavior in these regimes are revealed with PIV measurements. Flow topologies extracted with PIV measurements differ in these three flow regimes and were found to exhibit various flow features.Frequency measurements were conducted with the use of various experimental techniques including a method that allows non-intrusive measurement. The frequency characteristics were varied depending on properties such as the working fluid, scale and cavity geometry of the fluidic oscillator. Non-dimensional parameters were defined by taking the effects of these variables into account to allow effective comparison of fluidic oscillator designs. Furthermore, 33 modified designs were also tested to provide support for future fluidic oscillator modifications.

Name thesis:degree_name

Doctor of Philosophy

Level thesis:degree_level

doctoral

Discipline thesis:degree_discipline

Aero/Astro Engineering

Grantor dc:publisher

The Ohio State University

Year dc:date

2013

Author dc:creator

• Tomac, Mehmet Nazim

Contributors dc:contributor

• Gregory, James W.

• Aerospace Engineering
• experimental fluid dynamics
• refractive index matched particle image velocimetry
• flow control
• flow control actuators
• fluidic oscillator
• feedback-free fluidic oscillator
• jet interactions
• jet bifurcations

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=osu1357142702

OAI identifier oai:identifier

oai:etd.ohiolink.edu:osu1357142702