Axial Flow Turbines
IntroductionAlmost all electrical power on Earth is produced with a turbine of some type. Very high efficiency steam turbines harness about 40% of the thermal energy, with the rest exhausted as waste heat. Most jet engines rely on turbines to supply mechanical work from their working fluid and fuel as do all nuclear ships and power plants.
- An axial turbine operates in the reverse of an axial compressor. A set of static guide vanes or nozzle vanes accelerates and adds swirl to the fluid and directs it to the next row of turbine blades mounted on a turbine rotor.
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The Euler Theory
The Aerofoil Theory Used For TurbinesCombining the Velocity Triangles:
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Lift Drag (where Chord)
The vector sum of and is the resultant force on the Vane element.
The components of in the tangential Direction is given by: And the Axial component is : For Vanes:
The Total Tangential Force =
The Horse Power output Total Axial Force The Thrust on the Bearings.