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Ed,
Cones are the GO.
Any bare edge will take a battering from the heat and shock waves. Cones formed back to back eliminate any edges.
There must be supporting structure for the cones, I've used 1/4" solid round bar welded into the exhaust skin.
George (down under)
As you can see a couple of the fan blades have been beating off by the
exhaust pulse. I think at least part of the reason is that the tips were
unsupported (i.e. not welded to the tube wall) which of course made them
very susceptible to fatigue from the pulses.
Also, if I had the time, I would probably have tried to form more of a cone
shape with the discs to reduce the surface area of the disc perpendicular to
the shock wave. But, too many projects and not enough time {:>)
Ed
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