Introduction to STEAM TURBINE…..!!!!

STEAM TURBINE is a rotary machine which converts Heat Energy of Steam into Mechanical Energy.

WORKING PRINCIPLE – “ When we allow steam to expand through a narrow orifice, the Kinetic Energy of Steam is converted into mechanical rotational energy through Impact or Reaction of steam over the blades of Turbine “

Types of Turbine – The main types are:

1.     Impulse Turbine:

·        In this type of turbine, steam is expanded in fixed nozzles.

·        Does work on the moving blades

·        No pressure drop over the moving blades

2.     Impulse-Reaction Turbine:

·        Both fixed and moving blades act like nozzle.

·        Work is done by the impulse affect plus a reaction effect due to the expansion of steam through the moving blades.

Steam Turbines can also be classified according to various other parameters like:

Ø Direction of Steam flow

Ø Number of Cylinders

Ø Method of Governing

Ø Principle of Action of Steam

Ø Heat balance Arrangement

Ø Steam Conditions at inlet of Turbine and Shaft Arrangement