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Author Topic: RD-701 tripropellant rocket engine  (Read 3258 times)

Offline Michel Van

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RD-701 tripropellant rocket engine
« on: January 22, 2012, 03:40:00 am »
MASK was a Shuttle program in Soviet union
it had to use a An-225 how carry the Orbiter with Fuel tank, to launch at 8 km high

the Orbiter Glushko RD-701 rocket engine  are uniquely
they use in begin oxygen/kerosene later the engine switch on oxygen/hydrogen

Are there any Information how this switch had to work ?
The information are contradictory
some say that engine simply used the warm kerosine feed-line for deep cold hydrogen
but this is very problematic because the turbo-pump is design for kerosine and all remaining kerosine would freeze to solid, destroying the engine
Other claim that the engine burn oxygen/hydrogen from the begin and the kerosine is add for trust increase

so how had Glushko solve this problem ?
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Offline martinbayer

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Re: RD-701 tripropellant rocket engine
« Reply #1 on: January 22, 2012, 09:31:41 am »
Michel,

have you checked the information at yoonc.tistory.com/attachment/ik11.pdf? Figure 31 shows a cycle schematic with separate feedlines.

Martin
 
 
« Last Edit: January 22, 2012, 11:54:43 am by martinbayer »
Would be marching to the beat of his own drum, if he didn't detest marching to any drumbeat at all so much.

Offline Michel Van

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Re: RD-701 tripropellant rocket engine
« Reply #2 on: January 22, 2012, 10:37:02 am »
Michel,

have you checked the information at yoonc.tistory.com/attachment/ik11.pdf? Figure 31 schows a cycle schematic with separate feedlines.

Martin

No, this PDF is unknown to me !
many THX for Link, Martin

so the Mystery is solve
the RD-701 was 5 Turbo pumps ! powered by two preburner (oxygen/kerosene)
kerosine and Hydrogen have apart feed-line into the two combustion camber 
already from at ignition  Hydrogen  is used to cool the two combustion camber
« Last Edit: March 03, 2018, 01:33:12 am by Michel Van »
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Offline Archibald

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Re: RD-701 tripropellant rocket engine
« Reply #3 on: March 19, 2018, 10:26:51 am »
Great scot, that document is very interesting !
« Last Edit: March 19, 2018, 10:43:44 am by Archibald »
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Offline LowObservable

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Re: RD-701 tripropellant rocket engine
« Reply #4 on: March 27, 2018, 03:37:41 am »
A tri-propellant engine delivers max thrust (lift-off/initial acceleration at max weight) on LOX/kerosene and max Isp on LOX/LH2. For the MAKS spaceplane, the reduced motor size and weight and lower tankage volume more than compensated for the reduced Isp.