In the latest Armadillo update, John writes:
"I think we are going to fabricate and test an expansion-deflection nozzle
for our bench test 5.5" engine."
I'll be very interested to see how well it works. Both the Hagemann paper
in the Sept/Oct 1998 JP&P, and the earlier work in NASA TN D-4462 (from
1968), agree that E-D nozzles do not in fact altitude-compensate very
well. Aspiration effects tend to take their base pressure down well below
ambient. TN D-4462 says that adding secondary flow from the base didn't
help much.
The interesting question is, why do plug nozzles work (at least, TN D-4462
found that they did) while E-D nozzles fail? Lots of unexplored corners
here...
Henry Spencer
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