[SS-VehDev]

[Rich Nakka]

Roman,
I think your proposed experimental setup is a good one.
The trickiest part of such a test is relating the "heat flux' from the 
torch to the heating conditions the vehicle may experience in flight. As 
it happens, I read an article earlier today that'll help in this regard:

"COMPARISON OF TWO KINDS OF EXPERIMENTS FOR ESTIMATION OF THERMAL
PROPERTIES OF ABLATIVE COMPOSITE"
http://www.me.ua.edu/3icipe/FinalPapers/exp01.pdf

It mentions a simple way to determine the heat flux (actually, the 
convective heat transfer coefficient), which is the key. A copper 
specimen is heated with the torch under the same test condition and the 
temperature measured  (on the backside). The coefficient can be readily 
calculated from this. Instead of copper, I 'd suggest aluminum 6061 
alloy, for which thermal properties are precisely known.

cheers
Richard



Ing. Roman Lev wrote:

>Hi all,
>
>please find attached files - design proposal for heat testing of coupons for NC. Dimensions for example 1by 5", window in the insulation 1x1". Thermocouple would be embeded on the exposed surface, between layer of tested thermal insulation and outer skin, below the inside skin. All the samples would be heated under same conditions, time until bend would be indication of relative withstand capability against the exposition. First of all I would like to verify it on few "blind" coupons, just to verify reproducibility. Comments &, suggestions, please.
>
>thanks
>r+
>
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