Re: Specific Impulse
From: O18-C-O16 (hcf32_at_yahoo.no)
Date: 11/13/04
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Date: 12 Nov 2004 17:58:47 -0800
Thomas Lee Elifritz wrote
> O18-C-O16 wrote:
>
> >Btw, the SSME rocket engine is an impressive piece of equipment, but
> >the Russian RD 270 have to be the ultimate rocket engine ever
> >designed.
> >
> >
>
> But never flown.
>
> >http://www.boeing.com/defense-space/space/propul/SSME.html
> >
> >
>
> They have to fly, preferably several times.
>
> What I would like to know, if the full flow staged combustion technique
> of the Integrated Powerhead Demonstrator could be scaled up to engines
> in the 500,000 lbf or even 750,000 lbf class range. Ideally, one would
> like to minimize the number of engines in a cluster, and provide engine
> out capability, since in the future, the engines will probably be the
> most expensive part of a SSTO vehicle, and catastrophic abort recovery
> of the payload and passengers will probably be mandatory and routine.
>
> I know it's just a demonstrator, but 250,000 lbf seems kind of on the
> low side for practical applications. Hopefully they will have a high
> enough ISP, T/W and a channel wall nozzles, that was my main bitch with
> the RS-68.
>
> With the SSME too, it's seems ridiculous to abandon something that
> actually works.
The fuel pump and fuel controll system used in the SSME unit is
amazing, centrifugal pump running at 37 000 rpm while pumping
cryogenic liquids close to boiling. Only enginers not familiar with
cavitation could have boiled up such an impossible idea(me would have
thought if it had not been made and proved to work)
http://www.gewater.com/library/tp/785_Understanding_Pump.jsp
The russian rocket engines is even more technological 'unlikely' and
thus more impressive.
What I don't understand is why both the russian and american design
burns fuel to feed the turbo pump, from a piston engine perspective
that would be allmost like supercharging a large diesel engine with
the exhaust gases from a lean burning jet engine. Would it not be
better to use regenerativ cooling to feed the turbopump, cause if the
turbopump is not remarkable fuel energy efficient, lot of the energy
could be lost as low pressure/high temperature gas.
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