This is a bit out of my area of expertise except for oxygen compatible
seals which I have lots of experience with over 50 years of working with
LOx and high pressure GOx.
The spring energized lip seal is a fantastic active seal that's available
OTS for ~$100 each. Inside or outside pressure sealing cryo to high temp
inconel.
As far as your nitrous thermal equilibrium issues sound like you're heading
in the right direction. Knowing the nature of the beast is a major part of
resolving any engineering problem.
Good luck,
Ken
On Thu, Jul 23, 2020 at 4:59 PM <mark.spiegl@xxxxxxxxx> wrote:
Troy Prideaux Wrote:
I’m assuming then we’re talking about a non-vented tank here?
Not exactly.. Im still stubbornly pursing fixed temperature (ie low)
Nitrous..
The tank vents until a predetermined pressure and temperature are reached,
then the vent closes. Since Nitrous rockets are long and thin, the
temperature variations in a 5,6,7,8 foot tank are huge.
Common sense says that high pressure, oxygen safe, dynamic seals are
really hard to make. However, the seal is not connected to a pump. It would
connect to a stirrer.
Is this a reasonable approach?
A small thin axle with paddles, a corkscrew, whatever..
The axle traverses the entire length of the tank, and out the top bulkhead.
Seal the top bulkhead with a standard oring, EPDM Fluorosilicon whatever
Connect the axle to a wimpy battery powered motor.
Run the motor at 10s of rpm.(*)
The dynamic seal wouldn't need to last long.
Another idea is building a static heat pipe. Heat pipes work well in
electronics, but I seriously doubt they scale.
--MCS
(*) Of course I already have a small motor to power Troy's pyroless
ejection system. :-D
Da'yam that one of my favorite ideas from this list!