I've experimented with chilling nitrous with a big bucket of ice water and
then pressurising with helium. Theoretical big density isp gains but we had
lots of trouble with combustion stability.
Andrew
On 4/08/2015 1:40 pm, "Anthony Cesaroni" <acesaroni@xxxxxxxxxxx> wrote:
I did a lot of work on cryo N2O for a DARPA/ONR project a few years back
with GASL. The performance gains are significant and there's a potential
improvement in safety when you think about it.
Good luck.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
On Behalf Of Mark C Spiegl
Sent: Monday, August 03, 2015 9:34 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Peltier specifications
Wow... Im out of the office for a day and my inbox is full! :-)
Anyway.. Anyone who has followed my hybrid projects knows Im a fan of high
density Nitrous. Im looking to cool 20-50 lbs of Nitrous to 25-ish degF.
Goals:
(1) Flashing liquid to vapor to chill Nitrous is fine in a motor burning
10-20 lbs of Nitrous. Much above 20lbs (esp in the desert), flashing liquid
to gas becomes impractical. I would like to start a little closer to my
target temperature of 22 degF. The Peltier, Stirling Cooler, or whatever
would chill the supply tank, not the rocket tank.
I know ice is a quick-and-dirty answer, but I would like something a
little more elegant and deterministic. Bags of ice aren't a great answer at
FAR or Blackrock.
(2) I have had trouble igniting high density Nitrous in warm weather.
Cold weather is no problem. I cannot prove what is happening, but I suspect
temperature gradients in the long thin Nitrous tank are causing the
problem. If the Nitrous is 22 degF at the top of the tank, it may be much
much colder at the injector. Supplying Nitrous close to the final
temperature should help mitigate this problem, if Im correct.
A related question: Any simple ways to equalize temperature between the
top and bottom of the rocket's oxidizer tank???
--MCS
(Im an EE kind of person so my solutions tend to feel like electronics...
ie Peltiers)