Brian,
I think he was talking about autogenous pressurization. It's used on a few
rockets already. Basically you have a system that pulls a little gas or
liquid from the main tank, pumps or compresses it up to a higher pressure,
adds some heat to it, and then reinjects it into the tank as a warm gas.
It's a big part of what ULA is doing with their IVF system on Centaur and
ACES. Their whole point is to allow you to just have two fluids on the
stage--LOX and LH2.
It's true that pressuring LOX with GOX will want to cause some of the GOX
to recondense, but if you can keep mixing low, you can compensate from that
using your autogenous pressurization system. If you tried to pressure LOX
from a GOX tank that you couldn't replenish, that would be a bad idea, but
for an autogenous pressurization system, you should be fine.
~Jon
On Fri, Dec 11, 2015 at 3:11 PM, Brian Feeney <alaiadesign@xxxxxxxxx> wrote:
Bill, what cycle are you suggesting to boil the liquids? Self pressurizing
to 300 psi for LOX to O2 gas certainly works and has been demonstrated
along with methane. Self P for LH2 is I believe, under that pressure range.
It was mentioned to me years ago that LH2 may have some other difficulties
in a self pressurizing system given its extreme cryogen nature.
Stratification? I don't though have a good handle on it one way or the
other.
Cheers
Brian Feeney
On 2015-12-11 4:55 PM, "William Claybaugh" <wclaybaugh2@xxxxxxxxx> wrote: