PRESENTATIONSME4331

Terry SimonTHERMAL SCIENCE LABORATORY

April 13, 2006

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OUTLINE•INTRODUCTION

•PURPOSE OF YOUR PRESENTATION

•OBJECTIVES OF THE WORK TO BE

PRESENTED

•MAIN OBSERVATIONS – A SUMMARY

•DELIVERING YOUR MESSAGE•OBJECTIVES

•PROCEDURE AND FACILITY

•RESULTS

•CONCLUSIONS

•SUMMARY AND RECOMMENDATIONS

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•INTRODUCTION•PURPOSE OF YOUR PRESENTATION

•Remember, you are only introducing at this point. This will be short, but important.

•Consider your audience. What are their interests? Target your presentation to them.

•OBJECTIVES OF THE WORK TO BE PRESENTED

•Remember, in the body you will discuss how you met the objectives, or you will comment on how continuation work might meet them.

•Relate the objectives to the audience. What will they want to learn?

•MAIN OBSERVATIONS – A SUMMARY

•The essence of what you learned. A teaser to get them interested and attentive to listen for the details.

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•DELIVERING YOUR MESSAGE•OBJECTIVES

•PROCEDURE AND FACILITY

•Identify cases studied; parameters varied.

•Show a picture or schematic (whichever is

more clear to understand at a glance).

•Discuss measurement methods and instrumentation. Show a picture or a schematic (whichever is more clear) if needed.

•RESULTS

•Give the most important results, don’t dilute with minor results.

•Give enough description that all understand how you arrived at these results.

•CONCLUSIONS

•What are these results telling?

•What conclusions can be drawn from them.?

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SUMMARY AND RECOMMENDATIONS

•Repeat the highlights of the presentation. Tell them what you just told them.

•Your objectives.

•How you approached the question.

•What was done

•What was concluded.

•Here is where your main results (only a few main ones) are clearly presented.

•There will undoubtedly be unfinished business or reflections on how the work may be extended. Address it here. This should not be a dominant part of this section – a presentation of the most important results is the most important part.

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OTHER POINTS TO KEEP IN MIND

•Reference the work and contributions of others.

•Reduce the number of main points per slide to a few, no more than five or six. You may want to step through them.

•Stay within your allotted time. The audience will accept a presentation that is a bit too short, but is not very tolerant of one that is too long.

•Say, “This is important to me and I want it to be important to you!” by:

•Looking at the audience.

•Speaking to the audience; slowly, distinctly, with appropriate volume and with enthusiasm.

•Dressing appropriately.

•Avoiding slang and “casual” language.

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MORE POINTS TO KEEP IN MIND

•Move a bit. Don’t be a statue, but don’t be too busy either. Use hand gestures, but not excessively. Keep your hands out of your pockets and don’t fiddle with whatever you may be holding.

•Use crib sheets if you must. Though, with practice, you should not need them except for some details you wish to be sure to get right.

•Decide ahead of time how you will note various points on the visuals: rigid pointer, light pointer, mouse pointer, etc.

•Figure out ahead of time what questions may be asked, and prepare responses.

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AND, MOST IMPORTANTLY:

•PRACTICE

PRACTICE,

PRACTICE

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Some example slides.

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DOE

NASA

Unsteady temperature measurements within the regenerator

Computation and visualization of unsteady flows within the engine expansion space,

Bulk flow

Temperature

Stirling Engine Aerothermal Experiments

Tim

eRadial Location

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High Temperature and Plasma Laboratory

Selected Current Projects Arc plasma instabilities and plasma generator control

• plasma jet shear layer instability diagnostics and control - experimental investigation of fluid dynamic interaction between

plasma jet, cold gas • arc-anode attachment instability

- effect of cold gas boundary layer - 3-D time dependent model of

plasma fluid dynamics • plasma cutting torch optimization

- cathode erosion studies - nozzle design effectiveness

through spectroscopy

13y (mm)

x(m

m)

-40 -20 0 20 40 60 80

0

3

6

9

12

15

18

21

24

Constrictor Tube WallConstrictor Tube Wall

Co

ldG

as

Anode Inner Surface

Anode Region

I=100 A, Qarc=5.0 slpmQcold=15.0 slpm

x (mm)

y(m

m)

-40 -20 0 20 40 60 80

0

3

6

9

12

15

18

21

24

TH: 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 11500

Constrictor Tube WallConstrictor Tube Wall

Anode Region

Co

ldG

as

Anode Inner Surface

I=100 A, Qarc=5.0 slpmQcold=15.0 slpm

Anode Boundary Layer Modeling

Temperature and velocitydistributions and Comparison with photo

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Atmospheric Aerosol Research

• Instrumentation Development

– novel measurements

– commercialization

• Laboratory Research

• Atmospheric Research

– multidisciplinary field studies

– radiative transfer

– nucleation

– gas-to-particle formation

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• Real world and laboratory emission measurements

• Sensors

• Renewable fuels

• Fundamental studies

Engine and particle research in Center for Diesel Research

Microengine

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Advanced Space Power Source Stirling Convertor Regenerator Microfabrication

Technical Challenges

• Identify right concept & fab technique

•Fabricate the regenerator with microfab techniques

•Address life & reliability, in addition to performance

Concepts

Lenticular

Honeycomb

Involute Foil

NASA Space Power Initiative

Goals•Microfabricate new Stirling convertor regenerator

•Precisely defined geometrical features that can be refined to enhance radial heat transfer & reduce axial heat transfer & DP

•Improve the performance of the Stirling engine

Shear Flow Control

Laboratory

Shear Flow Control

Laboratory

Dynamics & Control of Low-Density Jets

Low density jets are inherently unstable, leading to considerable mixing between the primary jet fluid and surrounding ambient fluid. Control strategies are being developed to exploit the stability characteristics of these flows.

Dynamics & Control of Low-Density Jets

Low density jets are inherently unstable, leading to considerable mixing between the primary jet fluid and surrounding ambient fluid. Control strategies are being developed to exploit the stability characteristics of these flows.

Schlieren ImageSchlieren Image

PIV ImagePIV Image

Combustion using JP-10 Jet Fuel

Research is being carried out to better understand the turbulent flame characteristics in a backward-facing dump combustor proposed for use in a scramjet engine. Lean premixed-prevaporized JP-10 jet fuel is introduced upstream of the step and burned downstream of the step producing a bright blue flame. In the absence of control the flame is highly unstable, producing strong oscillations. Counterflow is applied at the trailing edge of the step to disrupt the periodic motion, leading to a stable flame located in the lower portion of the combustion chamber.

Combustion using JP-10 Jet Fuel

Research is being carried out to better understand the turbulent flame characteristics in a backward-facing dump combustor proposed for use in a scramjet engine. Lean premixed-prevaporized JP-10 jet fuel is introduced upstream of the step and burned downstream of the step producing a bright blue flame. In the absence of control the flame is highly unstable, producing strong oscillations. Counterflow is applied at the trailing edge of the step to disrupt the periodic motion, leading to a stable flame located in the lower portion of the combustion chamber.

U1U1HH

U2U2

Schematic

Stable combustion using counterflow – heat release ~ 100 kW

Develop heat exchangers for charge-air coolers and radiatorsDevelop collectors & heat exchangers for solar water heating

Polymer Heat ExchangersPolymer Heat ExchangersNSF, DOE-NRELNSF, DOE-NREL

Goals

Theoretical and experimental studies of unique tubular geometries for enhanced heat transfer

Shaped Tubes

Woven Tubes

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Micro-channelsMicro-channels: : Flow boiling &Flow boiling &forced convectionforced convection

Micro-channelsMicro-channels: : Flow boiling &Flow boiling &forced convectionforced convection

FlowFlow

30

40

50

60

70

80

90

100 110 120 130 140 150 160 170 180

Time (sec)

Te

mp

(C

)

30

40

50

60

70

80

90

100 110 120 130 140 150 160 170 180

Time (sec)

Te

mp

(C

)

Steady state void pattern resulting from boiling. Average void ~0.20. A color CCD camera is used to obtain a qualitative measure of outlet void fraction.

Transient temperature responseTransient temperature responseof a micro-channel plateof a micro-channel plate