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The Reheat Pipe before any modifications
have been made.
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The distorted
exhaust spike shown center is one of the reasons that
the reheat tube is going to be stripped down.
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A
view of one of the very nice fuel injectors.
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The original
nozzle has now been cut off which will now let me remove
the exhaust spike assembly and flame holder without obstruction.
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The flame holder
plate removed.
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Exhaust Spike assembly removed. I expect the reason
that the cone distorted is because the supports are square
to
the mount, not allowing for any thermal expansion.
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Stainless Steel
flange has been mounted.
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As I am getting
a new non-reheat cone made with a 2" nozzle for
the JFS100, I thought the old nozzle would be a good
starting point for the
reheat
tube. This has a nozzle diameter of 3 1/2".
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I felt the the fuel nozzles were to
close to the fuel gutter, so I have reversed them to face
forward. Now they are only about 20mm form the turbine
wheel, but the gas flow should keep the atomised fuel well
away.
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Temporary igniter
plug fitted without its flame guard and also the thermocouple
has been moved as far forward as possible.
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A view of the
fuel nozzles facing forwards. For the next test the exhaust
spike will be left removed to make any more adjustments
easier.
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Fuel flow control
system for the ReHeat. The fuel comes in from the bottom
right and in to the pump, with the valve fully open,
the fuel flows back to a Tee piece at the inlet side
of the pump, but when you start to close the valve, the
fuel
is made
to
flow out of the exit point to the left of the image.
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Hmm, have a look
at the first ReHeat
Test 01, it seems that along with the nozzle necks
and the totally un-aerodynamic stator ring, the flame
gutter has now moved to the fuel nozzle area, which isn't
good at all. You can see the entire reheat pipe glowing
red, where it should be just from the flame gutter area
backwards.
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Proof that reheat ignition is occurring
further forward than it should. The nozzles will now be
rotated 180deg to face backwards.
I have come to the folllowing conclusion:
The stator ring used is not appropriate for use in an afterburner
system due to the square edges exposed to the gas flow,
but would be more than acceptable in a normal turbo jet
environment.
If I
had
the time, I
could
possibly
add
a cone to smooth the outer air flow and obviously
make sure that there was a appropriate exhaust spike fitted
to help things along, these I feel would be required for
the reheat to function safely, so consequently I have made
a decision
to stop spending any
more time on
the afterburner,
as there are more pressing projects that I would rather
be spending my time on.
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