[AR] Re: [AR] Re: [AR] piston pumps and peroxide (was Re: [AR] “Transitioning...)
- From: Alexander Mikhailov <alexander.mikhailov@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 6 Apr 2023 17:53:39 +0000
When you run the numbers the energy density of modern batteries compares
quite well to the kinetic energy extractable from decomposed peroxide
monoprop in a practical steam engine. I did a presentation about this maybe
10 years ago at space access because when I looked at the numbers I was
floored by how good batteries are nowadays.
I'd definitely be very interested to look at that presentation.
My BOTE calculations for peroxide go like that: at ~50 atm liquid
output pressure amount of input peroxide to drive pumps is ~1/20 of
the total amount of peroxide, mass of pump hardware is negligible,
nothing to drop as too heavy.
What would be approximate numbers for electrical pumping system?
Alex
On 4/6/23, Alexander Mikhailov <alexander.mikhailov@xxxxxxxxx> wrote:
If you can power a piston pump with gas pressure, you can power a piston
engine to drive a screw pump. :-)
I guess piston engine wouldn't have parts count advantages over piston
pump, but you're right - one can convert gas pressure to a rotary
motion without a turbine.
Alex
On 4/6/23, Henry Spencer <hspencer@xxxxxxxxxxxxx> wrote:
On Thu, 6 Apr 2023, Alexander Mikhailov wrote:
The piston pump can be powered by the gas pressure from the gas
generator. Looks like the screw pump requires either electric motor -
with heavy batteries - or a gas turbine, which could be more complex.
If you can power a piston pump with gas pressure, you can power a piston
engine to drive a screw pump. :-)
Henry
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