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Marc,
I agree with your comments, but also can see where Mike is coming from - it horses for courses.
The complexity is doing it right and minimizing those drag issues. A simple tube in tube will give adequate -ve pressure, it seems you get better results if you use a cone or bell shaped inlet - as in the inlet manifold ( which makes sense), and use a rounded exit lip ( as in the inlet) to minimize sharp edge turbulence, which also makes sense. Some may see this as overly complicated. However I see the benefits of a properly shaped exit as being as much a benefit as the inlet shape, so in that area alone it worth the discussion.
George ( down under)
Mike Wills wrote the quorp passages:
"1) It adds measurable weight."
Compared with what? What if a small addition of weight solves your cooling problems and reduces cooling drag. Would you refuse to do it?
"2) It adds complexity."
How complex can a device with no moving parts be?
"3) It adds noise (that alone in hindsight makes me glad I didn’t do it - god knows I don’t need more noise)."
No. Mixer-ejectors are used for noise REDUCTION. Successfully.
"4) And finally, not a single person I spoke with noticed a measurable improvement in either cooling performance or drag reduction after adding an augmentor, or noticed a measurable reduction after eliminating the augmentor."
You seem to have consulted a very select group. In volume 2 of Alternative Engines, page 139 et seq, Charles Airesman Jr. documents his experiments with a very primitive ejector that generated 6 inches of water pressure drop under shop runup conditions. That equates to a considerable shaft power savings, more reliable ground cooling and a big step forward. And this was Airesman's first attempt.
There are other success stories if you choose to seek them out.
Best regards,
Marc de Piolenc
Those seem like good enough reasons to pass on an augmentor unless you are one of those guys that just has to prove it to yourself.
Mike Wills
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