Backwards, the exhaust of the turbopump is fed into the engine bell,
where the expansion takes place. You may be thinking of a turbo in a
piston engine, which runs parasitically off the exhaust. The pump has
to start before the fuel to get the fuel into the pump, right?
Chicken/Egg thing, there won't be any combustion in the chamber without
fuel being pumped into it.
Ben Hallert
PP-ASEL
|