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Mechanical engineering one liner

  • A nozzle is said to be a convergent nozzle when the cross-section of the nozzle decreases continuously from entrance to exit.
  • A turbine is said to have an axial discharge when the steam leaves the blade tip at 90° to the direction of the blade motion.
  • The flow through a nozzle is regarded as isentropic flow.
  • The ratio of total useful heat drop to the total isentropic heat drop, is called internal efficiency.
  • The pressure at which the steam leaves the nozzle is known as back pressure.
  • The discharge of steam in a convergent-divergent nozzle remains constant after the throat (i.e. in the divergent portion of the nozzle).
  • The rate of discharge through the nozzle increases when the exit pressure is gradually reduced.
  • In a nozzle, whole frictional loss is assumed to occur between throat and exit
  • The impulse reaction turbine has its driving force partly as an impulsive force and partly as a reaction force.
  • A regenerative steam cycle renders decreased work output per unit mass of steam as well as increased thermal efficiency.
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