Classification of Steam Turbine

The steam turbines can be classified in several ways lets look

• Direction of Steam flow:
  Axial Turbine: Those turbines in which steam flow parallel to turbine shaft axis. Example Kaplan turbine ,Propeller turbine
  Radial Flow : Those turibne in which steam flow perpendicular to turbine shaft axis .Example Francis turbine older version
  Mixed Flow : it is a mixture of axial and radial flow

• Number of Pressure Stages:
  Single Stage Turbine :  Which have one or more velocity stages They are normally use where small power capacities is required Example Centrifugal compressor ,blowers etc
  Multistage : They are used where heavy work load is required

• Steam conditions at the inlet of turbine
  Low pressure turbine
  Medium Pressure turbine
  High Pressure Turbine
  
  
• Number of Cylinders
  Single Cylinder Turbine
  Double Cylinder Turbine
  Three Cylinder Turbine
  Four Cylinder Turbine
  
  
• Base on the action of Steam:
  Impluse turbine
  Reaction turbine
  
  
• Base on Heat Drop/exhaust Conditions:
  Condensing turbine with generators: In these turbines in which steam pressure is less than atmospheric pressure is directed to a condenser.
  Back pressure turbine
  Topping Turbines
  Back Pressure turbine with steam extraction from intermediate stages at specific pressure
  Low-pressure turbines
  Mixed pressure turbines
• Method of Governing
  Turbine with throttle governing
  Turbine with by pass governing
  Turbine with nozzle governing