It doesn't need to be that fast. Just faster than Vcj in the material.
John, you did I assume get computed Vcj and tested Vcj in the series, right?
-george
Sent from my iPhone
On Apr 22, 2018, at 4:12 PM, Henry Vanderbilt <hvanderbilt@xxxxxxxxxxxxxx>
wrote:
On 4/22/2018 3:52 PM, John Schilling wrote:
On 4/22/2018 3:38 PM, Henry Vanderbilt wrote:"And in step three, we show that achieving FTL speeds in the injection
On 4/22/2018 1:26 PM, John Schilling wrote:
It's just that, once you ignite the stuff in the chamber, it gets real
enthusiastic about passing the word to its still-chill friends about this
hot new "fire" stuff and convinces them to try it out before they've
reached the proper venue. I don't think we ever measured a critical
diameter.
Well-behaved until it meets a significant ignition source, then everything
with physical continuity to the ignition point undergoes a
deflagration-to-detonation transition. We had some ideas on how to
approach that, but nothing that would meet cost and schedule and nothing
we were going to submit an F-15 crew to.
Get the fluid velocity in the injector higher than the detonation-front
velocity?
Sorry, bad joke, couldn't resist...
manifold allows the safe and practical use of a monopropellant with 320
seconds of specific impulse, thus revolutionizing space travel!"
I'm not greedy - I'd settle for injection velocity around 20,000 m/s.
That's about twice the detonation velocity of the fastest explosives listed
at https://en.wikipedia.org/wiki/Table_of_explosive_detonation_velocities ;
which should give a reasonable safety margin.
And that'd also be about 2000 seconds Isp even before you combust the
propellant...
Henry