SOLUTION SPEECH OUTLINE

gapingthingsUrban and Civil

Nov 15, 2013 (3 years and 8 months ago)

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SOLUTION SPEECH OUTLINE


Name:
William White

Title:
Cryogenics
-

the Anti
-
p
lasma

Purpose Statement:
To describe in painful detail how it is possible to limit the
overheating
in railguns with liquid and cryogenic cooling.

Thesis Statement:
The proper way to prevent overheating and thermal hotspot damage
in railguns is by actively water cooling the
rails and by cryogenically
cooling projectile
armatures before launch.


Introduction
:


Attention:
The time is 6:00 AM
. Two hundred miles

inland f
rom the Persian Gulf a
platoon

of US marines is fighting desperately for their lives, pinned down by insur
gents.
6:01 AM, the commanding
officer radios in for

artillery

support. 6:06 AM, an artillery
barrage hits ground, so accurate

that

the marines can
stand on one side of the street while
it rains hell on the other.


Credibility Statement:

I would like to see this become a reality. In my research, I have
discovered that railguns are the weapon of the future, and I am here to share what I have
found wit
h you.


Recap:

The last time I spoke with you, we discussed the problems associated with
overheating in railgun operation.


Thesis Statement:

The proper way to prevent overheating and thermal hotspot damage in
railguns

is by actively water cooling the rails and by cryogenically cooling projectile
armatures before launch.


Preview of Main Points:

This is a two part process, and I will explain both water cooling
and cryogenic cooling, and why they are viable solutions.


T
ransition:

Allow me to begin with my first recommendation for heat management
-

cryogenic cooling.


Body:


1.

Liquid nitrogen can be used to cool the aluminum
projectile
armatures

prior to
launch, preventing melting and rail degradation. (Toulmin Model)

A.

Reduc
ed temperature allows for greater heat absorption. (McNab

et al.
, 2001)

B.

Less melting prevents aluminum deposits on rails, and decreases energy loss
to plasma superheat.

C.

However, liquid nitrogen is dangerous and costly, and should only be used
until material sciences catches up with
design demands.


Transition:
Unfortunately, cryogenic cooling alone is not enough to solve the problem of
overheating.


2.

Ohmic heating in the r
ails can be combated

by a
fluid flow watercooling process
,
which is simple and inexpensive
. (Toulmin Model)

A.

Water enters the rails, absorbs heat, and exits to release waste energy.

B.

A single 64MJ railgun shot raises internal rail temperature anywhere from 5

to
25K
. (Smith et al., 2005)

C.

This thermal loading can be carried away in less than eight seconds by a
steady stream of water flowing through the center of the rails. (Jamison et al.,
1995)


Transition:
So with the addition of liquid water cooling, it is e
ntirely possible to manage
the heat generated during railgun launch.


Conclusion:


Recap:

We’ve seen how bathing the projectile in liquid nitrogen prevents damage to the
interior of the railgun rails, and how pumping water through the rails carries away
th
ermal buildup during firing.


Final Appeal:

Using liquid nitrogen is risky, but greatly improves the railgun efficiency.
Imbedded watercooling is rudimentary, but sufficient for ohmic

heat reduction. Both of
these strategies combined should be enough to make railguns a viable weapon, until
technology advances to the point where more sophisticated methods may be used.


Closure:

I hope you have all taken something from this presentation
, whether it be a
better understanding of railgun engineering or a better appreciation for ice cream.