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Oblique Jet Exit

Oblique Jet Exit

Oblique Jet Exit

(OP)
I'm thrashing about for a way to deal with a "jet" that emerges from a plate at an oblique angle.  The air flow is conducted to the manifold with hoses and fittings with an ID of about 0.28".  It then arrives at a tube that is welded to a flat plate at a 15 degree angle.  The exhaust hole is now elliptical.  Normally one would expect a jet like this to be attached tangent to the radius of the turbine, but not this time!
The jet of air impinges on an axial-flow turbine.  I am sort-of reverse-engineering the turbine, which I can handle, but the flow coefficient at this port keeps coming out >1!  The objective of the project is to insert a flow restriction in the air supply line to keep the turbine from overspeeding.

Thanks in advance for the help you can provide.  Please bear in mind that I'm a structural eng, so I'm full of stupid questions about fluids.

In case you want some more numbers, P=75-80 psi, D=0.28", rho=0.20 lbm/ft^3.

STF

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