View into the exhaust manifold inlet
receiving turbine exhaust gases from the fuel turbopump.
We see that the exhaust manifold is a duct
which is open to the exterior of the thrust chamber only through these
relatively small, circular cut-outs. The turbine exhaust flows through these
openings and enter the
thrust chamber in gaps caused by the introduction of the 180 half-length,
"down" tubes comprising the thrust chamber.
Although looking into the LOX turbopump exhaust
manifold inlet affords a view of more of these cut-outs, from this view
into the fuel turbopump exhaust manifold inlet, it appears that the cuto-outs
are evenly-spaced throughout the exhaust manifold.