Let me know when you're testing that so I can put my fingers in my ears.
I know I'm in Australia but still. ;-)
On 21/10/2020 12:43 pm, Anthony Cesaroni wrote:
Now you’re thinking. 😊
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On Behalf Of *ken mason
*Sent:* Tuesday, October 20, 2020 9:40 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: Hypothetical Lox cooling
Right but with a dash of colloidal metallic hydrogen.
K
On Tue, Oct 20, 2020 at 6:16 PM Anthony Cesaroni <anthony@xxxxxxxxxxx <mailto:anthony@xxxxxxxxxxx>> wrote:
Cryogenic liquid O3 will improve the heat capacity a bit and
should help with the supercritical pressure. A fuel such as
aluminum di-Z-ethyl hexo-ate gelled acetylene and aluminum would
be a good match.
Has anyone tried that?
Good night.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x1004 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx
<mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx
<mailto:arocket-bounce@xxxxxxxxxxxxx>> *On Behalf Of *Troy Prideaux
*Sent:* Monday, October 19, 2020 9:20 PM
*To:* arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
*Subject:* [AR] Re: Hypothetical Lox cooling
This is an answer from Henry Spencer on this list 10 years ago to
a similar suggestion:
/[quote]:/
/Assuming you mean *regenerative* LOX cooling, it's been done, but
it's quite rare. The problem is that it works reasonably well
only in the supercritical regime, which for LOX requires quite
high pressures, maybe 1000psi to have some margin. (You don't
want your coolant to pass close to its critical point as it heats,
because many properties change very sharply just there and it's
easy to get violent flow oscillations.)/
//
/Regen cooling with LOX at subcritical pressures just doesn't work
very well. The temperature range over which it is liquid is
short, and the latent heat of boiling is small, so it *will*
boil. And unless you do something tricky and unusual, you'll
almost certainly get into the film boiling regime, where heat
transfer is greatly impeded and wall temperature soars, usually to
the point of self-destruction. Even if you somehow get it past
the boiling transition, the volume flow rate is orders of
magnitude higher as a gas, so pressure drop in the cooling
passages will be large and flow resistance will be high, and
things get still more awkward if gas flow starts to approach Mach
1... Basically, you really want a regenerative coolant to stay
(at least mostly) liquid./
//
/There is also some long-standing superstition about oxidizer
cooling being unwise, but there have been a number of successful
oxidizer-cooled rockets (mostly using more cooperative oxidizers)
and this *is* just superstition./
//
/The temperature is a very minor issue by comparison. Liquid
hydrogen makes a wonderful coolant despite being even colder,
thanks to its very low critical pressure and some other helpful
properties. (People have seriously proposed
unbalanced-tripropellant systems which are mostly LOX/kerosene,
but also burn a small amount of LH2 so they can cool the chamber
with it.)/
/[end quote]/
Troy
*From:* arocket-bounce@xxxxxxxxxxxxx
<mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx] *On Behalf Of *Yucca Works
*Sent:* Tuesday, 20 October 2020 11:32 AM
*To:* arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
*Subject:* [AR] Hypothetical Lox cooling
I want to get this group's thoughts, experience stories, and
possibly advice on regenerative cooling with liquid oxygen at the
small scale (<500lbf)? I have read the public NASA paper that
concerns cracking in the chamber and local hotspots and have
looked into (what little has been released to the public)
Launcher's work with their small 3d printed copper engines. On
paper at least, it seems like one can get away with cooling from
the throat up (the entirety of the combustion chamber). This is
just curiosity-sparked research, nothing beyond that yet.