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View into the exhaust manifold inlet receiving turbine exhaust gases from the LOX turbopump.

Picture 1 of 2.

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.

 
Interior of J-2 Engine Thrust Chamber J-2111 LOX turbopump turbine exhaust manifold inlet at Marshall Space Flight Center
Time picture taken Tue Sep 16 09:25:30 2014
Location picture taken Building 4205
Marshall Space Flight Center
Huntsville, AL
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