RD-701 tripropellant rocket engine

Michel Van

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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 ?
 

martinbayer

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Michel,

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

Martin
 

Michel Van

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martinbayer said:
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
 

Archibald

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Great scot, that document is very interesting !
 

LowObservable

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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.
 
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