Hydraulics and Fluid Mechanics in ME
Reynolds number is significant in

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
supersonics, as with projectile and jet propulsion
All of these
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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Hydraulics and Fluid Mechanics in ME
Runaway speed of a hydraulic turbine is

The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
The speed at which turbine runner will be damaged
Full load speed
The speed corresponding to maximum overload permissible

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