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What happens is when a Finite
Amplitude Wave (FAW) hits a change in cross-sectional area (like an opening from
your tube to the atmoshpere or a plenium - or a decrease to a closed tube)
energy is reflected back down the tube. The amount depends on the extent of
cross section change, but opening to the atmosphere reflects most of the energy.
If the cross sectional area it sees is Larger then a FAW wave of the
opposite type is reflected. If the cross sectional area is smaller, a FAW
wave of the same type is reflected.
Hi Ed,
Thanks
for an explanation that was a clear as it could possibly be. Now that you
have confirmed that the change of cross sectional area is what triggers the
bounce, I can get back to a question that I asked you a few months ago (Kelly
just asked the same one).
Back
when Eddie was first being discussed, I asked if I could extend the runner ahead
of the TB, and have it count as part of the tuned assembly. At the
time, you said no, that it had to be after the TB. Is that your final
answer :-)
If
tuning is possible prior to the TB, then a short manifold will work great, and
offer easy tuning of the length.
Thanks,
Rusty
(new cowl looks muuuuuch better)
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