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Helical flow turbine

Helical flow turbine

Helical flow turbine

(OP)
This questioned was posed to in another forum but I'm still hoping to get some feedback.

I am wondering if anyone knows of any references regarding use of a helical flow machinery as a gas turbine.  Helical flow compressors (also referred to as side channel blowers and regenerative compressors) are common.  

I am curious how well they would perform as a gas or steam turbine.  In this case they would operate much like a fluid coupling except the circumferential fluid motion is caused by expansion down a pressure gradient, rather than by an impeller.  This circumferential motion should then induce helical flow for precisely the same reason as it develops in a torque converter.

Any input is much appreciated.

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