Course website is http://www.adl.gatech.edu/classes/ae6052/
 

AE 6052 Winter/Spring 2002
Flow Diagnostics and Control

School of Aerospace Engineering , Georgia Institute of Technology
Aerospace Digital Library

Catalog description (pdf file: click here)

Instructor: Dr. Narayanan M. Komerath
Rm 415-5, 894-3017, narayanan.komerath@aerospace.gatech.edu

Textbook: None. The Web Page resources of the Aerospace Digital Library are  used, along with links to the information provided by various organizations.

Web-Based Pre-Lecture Discussion

Lectures in different areas are scheduled to enable concurrent progress in several experiments.  The scheme is as follows:

1. The notes are posted on the web.
2. The class is asked to read a given portion of the notes, and explore various related issues. They are given a list of questions / discussion points by e-mail / web page. Responses are expected via e-mail within a set period. At the end of this, the discussion responses are collected and summarized on the web page by the instructor. Further questions are of course welcome at any time, and responses may be individual, or posted to the class on the web page.
3. Lecture time will be used mostly to summarize the concepts and clear up discussions.
4. Each experiment team (and if you wish, each student) will post their own web page, linked to the course page and each others' pages. These will also form topics for continued discussion.

Please help in this experiment, by participating, as well as by assessing how to do it better.  The objective is to be able to learn in a setting where the knowledge comes from diverse sources, and diverse theoretical areas. At the same time, the material that is learned is to be used in conducting experiments.
 

Projects

See project background & objectives here

Teams of two to three students develop each experimental project, then disseminate their knowledge to the rest of the class.  Each student prepares and presents an in-depth review on one selected research paper, and each team surveys the literature in the field of their experiment, and presents that along with their experiment.

Lecture Topics

G. Introduction to flow diagnostics, and general concepts
    G1:General Issues in Flow Diagnostics
    G2: Survey of Flow Diagnostic Techniques

B. Digital Signal Processing: statistical techniques for flow measurement
    B1: Introduction
    B2: Random Signals: Sampling & Filtering
    B3: Autocorrelations and Cross-Correlations
    B4: Spectral Density Functions; Wiener-Khintchine Theorem; Coherence; Transfer Function

See Signal Processing concepts at Johns Hopkins U:

Signals, Systems, Controls Demonstrations: Johns Hopkins U

Engineering tutorials for beginners: Johns Hopkins U

See Introduction to Wavelet Transforms here:Index to Series of Turorials on Wavelet Transforms by Robi Polikar: http://www.public.iastate.edu/~rpolikar/WAVELETS/waveletindex.html

C. Introduction to Electro-Optics and Lasers.

D. Flow Imaging Techniques: quantitative multi-dimensional measurement

E. Notes on Flow Control, or go to specific topics below

    E.1a.  Flow Control: Introduction & Obvious Applications
    E.1b.  Basic Concepts in Flow Control
    E.2. Theoretical Tools: summary
    E.3.  Shear Layer Control
    E.4: Flow Separation
    E.5. Vortex  Control
    E.6. Shock Control
    E.7. Control of Heat Release

References: Click here

SCHEDULE OF DISCUSSIONS
Discussion # Qns. due Answers due
1.    
2. Unsteady Measurements Feb. 6 midnight Feb. 11midnight.
         

Performance Measures:

1. Team performance on selected experiment: 33%
2. Individual performance on all labs: 33%
3. Performance on assigned "hypothetical" problem
and final presentation: 33%

Pre-requisites

AE3051 is specified as a pre-requisite because of the experience it provides in
a) conducting laboratory experiments using wind tunnels, data acquisition systems and delicate instruments,
b) the discipline and skills of making observations and writing lab reports.

The team approach to experiments makes it feasible to have a few people in the class who have not taken the AE3051. Those who have not taken either of these are encouraged to get a copy of the junior lab Manual (perhaps its already on the web?) and use it for reference on various measurement techniques. Ask for help on things that are unfamiliar to you. The purpose of the course is to learn.

Organization

To conduct successful diagnosis  and control of fluid dynamic phenomena, one must learn and understand the science of fluid dynamics, as well as the science of the diagnostic methods. This means that there is a good deal of serious theory to be learnt. We will use the 3 hrs/wk of "lecture" for this purpose, as well as to discuss what we encounter in the labs. We will set up and conduct 3 experiments, as described in the following: .

1. Turbulence measurement &  Flow Improvement in the low-speed wind tunnel
Team 1:

3. Aerodynamics of Winglets: effects of winglet dihedral on L/D.

4. TBD.

Experiment term papers

1. Phosphorescent Imaging in a vortical flow.
2. Visualization and Measurement of Nanoscale Phenomena.
3. Design of a dual- imaging system for volume velocity measurement in periodic flows.
4.

Notes on Teamwork

A team of no more than 3  will start on each experiment. The target is to get every experiment up and running within the first 6 weeks. Then each team will function as guides and hosts to the rest of the class so that everyone gets to use every experiment.

Certain items of team performance are extremely important :
Teams must function as teams: communication must be excellent, meetings must occur as and when scheduled; schedules will be set and met. Steady, dependable effort is expected. There will be no internal competition in any team, and no "welfare". Non-performers and prima donnas (those who feel themselves to be far above their teammates) will be asked to drop the course to avoid damaging the interests of the rest of the class. These said, it is still true that grades are given to individuals, not to teams. You are not expected to let yourself be dragged down or obstructed by others: you are expected to do everything in your power to pull your team forward.
 

Work from Previous Years (The "Word")
  Project Assignments in 1999
  Homework Assgt. No. 1
  Homework Assgt. No. 2
Flow Control Assignment 1: click here

Project Areas from 1997 are listed below:

1. Perpendicular interaction of a vortex with a wing. 
2. Acoustic Levitation experiment: signal processing. 
3. Acoustic Levitation experiment: flow visualization and numerical modeling.

4. Laser-based surface measurement on a parafoil.