In article ,
says...

Not sure of attriobutions anymore, sorry.

https://upload.wikimedia.org/wikiped...Scheme.svg.png

Is it corect to state that "Methane preburner" is the yellow area with
the text "512 bar, 811K?

Or does pre-burner include the plumbing to take some liquid methane for
a trip aroiund the engine bell and then back to the bottom of that area
labeled 512bar 811K ?

isWhen liquid methane the turbopump, does it exit either to the left,
going to the engine bell to get warm or to the right, going to the input
of the LOX turbopump? Or does some flow straight down to what I assume
is the pre-burner combustion chamber?


In that scmatic, would it be correct to state that the "business end"
from a thrust point of view is the narrow liquid methane pipe from the
methan turbopump that goes to the input of LOX turbopump, the two get
mixed together in turbopump, then go through a heat excanger (warmed up
by the pre burner) and into the main engine combustion to produce thrust?

The schematic seems to put a lot of emphasis on the pre-burner so not
sure how much of the fuel destined for actual thrust flows through
pre-burner vs going directly to the LOX turbopump.

Raptor is a *full flow* staged combustion engine. All of the LOX and
liquid methane flows through their respective preburners. Some very
tiny amount of oxygen and methane are used for other purposes, like
pressurizing the tanks, but *everything* that goes into the combustion
chamber goes through the preburners. That's why it's called "full
flow".

Also, silly question, but where do turbopumps get the mechanical energy
to turn and pus liquid to freat pressures?

From the preburners. The hot gas from the preburners expands and drives
a turbine. The turbine is connected by a shaft to the pump. Hence the
name turbopump. This is not at all dissimilar from the operation of a
turbojet engine.

In the case of mechane, if I read the graph right, would the preburner
output spin a turbine as it travels up and then right to engine and that
turbine then spins the turbp pump that suck liquid methane down?

Yes.

In the case of the turbopump for LOX where does it gets it mechanical
energy?

Yes.

Jeff
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