I was already assuming Black Arrow avoided peroxide boiling in the
cooling passages. Sorry my question wasn't clear enough: Does anyone
have any informed comment on how absolutely necessary, or otherwise,
that might be in using h2o2 as a coolant? As I said, my limited info on
the lower stability of peroxide as vapor is anecdotal.
Hmm. Per Wiki, "The boiling point of H2O2 has been extrapolated as
being 150.2 °C (302.4 °F), approximately 50 °C (90 °F) higher than
water. In practice, hydrogen peroxide will undergo potentially explosive
thermal decomposition if heated to this temperature. It may be safely
distilled at lower temperatures under reduced pressure.[7]"
So, possibly there's a practical upper temperature limit even if you do
pressurize it to raise the boiling point.
Does anyone _know_? Thanks in advance...
Henry
On 10/20/2020 12:05 PM, roxanna Mason wrote:
Maybe boiling, at the feed pressure, was avoided. Possible.
K
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On Tue, Oct 20, 2020 at 11:32 AM Henry Vanderbilt <hvanderbilt@xxxxxxxxxxxxxx <mailto:hvanderbilt@xxxxxxxxxxxxxx>> wrote:
Speaking of possibly exciting hobbies, what happens if you boil
peroxide in cooling passages? Is that another one of those things
one should avoid?
I gather peroxide cooling worked in Black Arrow, but I have the
impression from various distillation tales of woe that peroxide
vapor is much less stable than the liquid. I might guess both that
preheating the peroxide could help with catalyzing or directly
combusting it, and also that making sure it stays liquid till then
is indicated, but those are just guesses.
Henry
On 10/20/2020 11:09 AM, Doug Jones wrote:
A supercritical positive-heat-of-formation oxidizer with oily
contaminants leached from every step of the distribution chain.
What could possibly go wrong?
On Tue, Oct 20, 2020 at 11:04 AM Bruno Berger
<bruno.berger@xxxxxx <mailto:bruno.berger@xxxxxx>> wrote:
Am 20.10.2020 um 19:53 schrieb roxanna Mason:
> Is your fuel even less satisfactory?
> Perhaps it's a LOx/solid fuel hybrid and you want to cool
your nozzle.
>
Yep, we discussed that at ARIS for cooling the nozzle with
N2O for their
5kN hybrid. But N2O probably gets super critical which makes
me nervous :-(
Bruno