Hydraulics and Fluid Mechanics in ME
The specific speed of turbine is defined as the speed of a unit

Of such a size that it requires unit power per unit head
Of such a size that it delivers unit discharge at unit power
Of such a size that it delivers unit discharge at unit head
Of such a size that it produces unit horse power with unit head

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Hydraulics and Fluid Mechanics in ME
Mach number is significant in

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
supersonics, as with projectiles and jet propulsion
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
all of fhe above

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