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Engineering

Talking about steam turbines and how its work

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- Lecture 1 Chapter Five Turbines
- Turbines • Steam turbine is used to generate the mechanical power to drive the generator in steam power plant • In early stages, utilizing the steam power was done by reciprocating engines • The impulse principle: Change of momentum equals the impulse force
- Impulse Force calculation Flat Plate
- Impulse Force calculation (2) Flat Plate
- Impulse Force and power (1) Flat Plate • Power can be found as: • Note that the power equals zero if VB = 0, or Vs = VB • Efficiency: by dividing the power by initial power of jet • By differentiating the power with respect to VB and equating the result to zero:
- Impulse Force and power (2) Flat Plate • W Which means that the maximum power equals to one half the power of jet
- Impulse Force and power (1) Cylindrical Plate
- Impulse Force and power (2) Cylindrical Plate Now, instead of flat plate, consider a cylindrical blade that allows the jet to reverse direction (180 degrees), relative velocity at inlet (Vs – VB), Absolute velocity at exit (VB - (Vs – VB)) = 2VB – Vs. Then, Impulse Force is change in momentum: And Power equals to:
- Impulse Force and power (3) Cylindrical Plate
- Impulse Force and power (4) Cylindrical Plate

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