Paul,
I don't believe starting with a consumable catalyst will work. When a silver
catalyst gets poisoned with stabilizers, decomposition doesn't continue
thermally.
That's why I think that in order to decompose the peroxide sustainably without
a catalyst pack, you first need to achieve very high temperatures.
Btw, inconel doesn't react with peroxide, right? If it did it could prolly help.
IB
________________________________
De: Paul Breed<mailto:paul@xxxxxxxxxx>
Enviado el: 27/08/2016 19:59
Para: arocket@xxxxxxxxxxxxx<mailto:arocket@xxxxxxxxxxxxx>
Asunto: [AR] Re: FW: Re: "Direct" Hydrogen Peroxide engines
If I were going to try thermal decomposition
V1)
I've often thought the correct approach was to start with a robust cat pack
screen inconel etc...
Then plate with rough silver.... motor decomposes and strips silver off the
screens transitioning to
thermal decomposition on the inconel screens....
V2)Same as above, except initial decomposition was done with some kind of
pump able consumable catalyst like the purple menace.
Another thing I'd like to try is permanginate and peroxide in a stainless
static mixing tube....
On Sat, Aug 27, 2016 at 11:56 AM, John Dom <johndom@xxxxxxxxx> wrote:
Robert wrote on 270816:
The discussion was, could one start a peroxide kerosene motor by firstdecomposing the peroxide and then adding the fuel, and then switch over to
pure undecomposed peroxide and fuel to continue the run.
For biprop mode, if after ignition the cat pack is bypassed and the
undecomposed peroxide is allowed to THERMALLY decompose during the process
it can work, so was written. Many parameters come into play. Thermal
decomposition heat of the undecomposed HP is required for keeping
combustion in action. Another angle of this question is Andrews wrote his
Gamma engines (Black Arrow) required HTP (& kerosene) propellants to be
above a certain temperature limit, below which kerosene autoignition failed.
The thermal ignition in Sentgupta’s work highlighting the importance not
to have to rely on a cat pack do decompose HP the monoprop way required …
the exhaust heat of … a cat pack (P&W USP drawing). That is why I wrote the
paper does not explain how to thermally decompose HP *without *a catalyst
pack. Somewhat funny.
jd
