On Fri, 2004-01-23 at 04:43, Henrik Schultz wrote:
> Hi,
>
> We are working on an engine design with peroxide as the cooling agent.
>
> Since in a kero/HTTP engine you have about a 7:1 O/F ratio, there's
> plenty more HTTP to cool with, i.e. the flow rate is about 7 times
> larger. The only issues as I see it, is first of all to avoid
> overheating the HTTP in the cooling channels, as it would start to
> decompose in the channels, potentially leading to engine blowup.
> Secondly, you can't use copper or any other material which would cause
> the HTTP to decompose. On the positive side, you don't have problems
> with the kero leaving residue inside the cooling channels, i.e. no need
> for very refined kerosene (eg. RP-1).
Peroxide has a heat capacity close to that of water, so this gives you
really massive amounts of cooling. I think the problem is in local hot
spots in the cooling passages... so keep the flow velocity as high as
possible without eating it on pressure drop.
The materials compatibility issues should be solvable by either using a
material like nickel, which is sufficiently compatible for the
application, for fabbing the cooling channels, or by plating nickel or
some other compatible material on to the inside of the channels.
-p
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