Anthony,
Yeah it was a 'traditional' head-end injector with a cylindrical ported
plastic fuel grain, just taking from all of the normal hybrids we'd
previously constructed.
Andrew
On Tue, Aug 4, 2015 at 2:20 PM, Anthony Cesaroni <acesaroni@xxxxxxxxxxx>
wrote:
But it was a head end injected hybrid, correct?
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
*On Behalf Of *Andrew Burns
*Sent:* Monday, August 03, 2015 10:14 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: Peltier specifications
No we designed the motor to work using the densified nitrous but we also
tried to sneak the chamber pressure up by dropping delta-P over the
injector which probably didn't help. Also the L/D of our injector orifices
was in the 'danger zone' for hydraulic flip which was probably also a
contributor. Primary combustion instability frequency was around 90 Hz if I
remember correctly (either 90 or 110 Hz).
Andrew
On Tue, Aug 4, 2015 at 2:08 PM, Anthony Cesaroni <acesaroni@xxxxxxxxxxx>
wrote:
For sure if you were using it in a classical hybrid motor.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
*On Behalf Of *Andrew Burns
*Sent:* Monday, August 03, 2015 9:44 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: Peltier specifications
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)