internship presentation - southwest research institute · internship presentation kevin ciha august...

Kevin Ciha

Florida Turbine Technologies, Inc.

561-427-6400

KCiha@fttinc.com

www.fttinc.com

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Internship Presentation Kevin Ciha

August 8th 2014

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About me

• Originally from Appleton,

Wisconsin. (I come from

the land of the ice and

snow, the frozen tundra,

etc.)

• UTSR Fellow

• Bachelor’s degree in

Aerospace Engineering and

Mechanics from University

of Minnesota, Twin Cities.

• Currently pursuing a

master’s degree in

mechanical engineering at

the U of M.

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COLD FLOW TESTING

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Background

• Interior cooling is used in trailing edge. Air flows

around pins. (Usually cylindrical)

• Use room temperature air, hence “cold flow”.

• Test different pin configurations and shapes and find

their pressure drops.

• Tested three shapes with eight non-dimensional

spacings each.

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Background continued

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Non-dimensional Spacing

Shape H/D X/D S/D

A1 1.25 1.625 3.75

A2 1.25 1.1 3.75

A3 1.25 2.25 3.75

A4 1.25 1.625 3

A5 1.25 1.625 4.5

A6 0.625 1.625 3.75

A7 3.125 1.625 3.75

A8 2.43 1.937 3.876

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Effects of S/D on

Klo

ss

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Effects of H/D on

Klo

ss

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Effects of X/D on

Klo

ss

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Conclusions

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LITERATURE SURVEY OF PIN

FIN ARRAYS

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Terminology

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Introduction

• Compared fifteen papers about various pin

arrays with our cold flow testing data.

• Pressure drop and/or heat transfer in pin fin

arrays was studied in each paper.

• Goal to find correlations between Reynolds

number and Nusselt number.

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Previous Studies

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Journal Papers Surveyed

Reference # Primary Author S/D X/D H/D Pr Reh

1 G. J. VanFossen 4 3.464 0.5 0.7 250 to 56000

2 D. E. Metzger 2.5 1.5 to 2.5 1 0.7 5000 to 136000

3 D. E. Metzger 2.5 1.0 to 5.0 1 0.7 3700 to 187000

4 S. C. Lau 2.5 2.5 1 0.7 11500 to 42000

5 Lesley M. Wright 2 2 2 0.7 9800 to 40000

6 Kathryn L. Kirsch 2.33 2.33 0.8 0.7 5000 to 20000

7 Jenn-Jiang Hwang 2.5 2.5 3.55 0.7 6000 to 42000

8 M. L. Busche 1.63 1.074 0.5 0.7 3000 to 46000

9 D. E. Metzger 2.5 2.5 1 0.7 5000 to 120000

10 Oguz Uzol 2 2 1.5 0.7 32000 to 147000

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vs. Nu Correlation

Nu

pin

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vs. Nu Correlation

Nu

h

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Conclusions

• Pin configuration has little impact on Nusselt

number!

• However, both cold flow and journal paper

data shows that there are significant

differences in pressure loss among pin

geometries.

• While overall heat transfer is mainly governed

by Reynolds number, pressure loss is

governed by the restricted area of the pin

geometry.

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HYDROCARBON LEAK DETECTION

SYSTEM (OR HOW TO NOT BLOW UP

YOUR ROCKET ON THE TEST STAND)

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Overview

• Helped develop a concept to detect fuel leakage from a

propellant valve.

• Researched various sensors and their potential pros and

cons for this project.

• Found off the shelf components to create each

configuration of the HLDS.

• Did lab tests with various configurations of the HLDS.

• Some CAD modeling.

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One HLDS Setup

Laptop computer

with Arduino

software program

to interpret Color

Sensor signal

Arduino board

Color Sensor

held in tube

opening Light source held

in tube opening

Syringe to

supply the

RP-2

Air supply

line with flow

meter

Air & RP-2

vent line

Hydrocarbon Detection Coating is

painted directly on the inside of this

Tee tube fitting, at the intersection

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A Current HLDS Concept

Inlet Flow

Probe Holder

LED Light Source Holder

Exit Flow

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Acknowledgements

Special thanks to:

Jim Downs

Elizabeth Garvin

Alex Pinera

Tim Miller

Bryan Bernier

Tom Sexton

Ken Head

It’s been fun!

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Questions?