Difference: How an Impulse Turbine is Different from Reaction Turbine?

These turbines (Impulse Turbine) are classified by several ways.Most important is impulse turbine. Difference between Impulse Turbine  and reaction...

Turbines are used in power plant to run other utilities which can generate electricity. We have to use different types of turbines (Impulse Turbine), depending on power plant size and other parameters. The selection of proper turbine is very critical issue and an expert people in engineering can take right decision. As I am interested to share some sort of educational information, I can give here basic knowledge only (Impulse Turbine). The turbine is a prime mover in which a rotary motion is obtained by centrifugal force brought into action by changing the direction of jet of a fluid escaping from a nozzle at high velocity. These turbines (Impulse Turbine) are classified by several ways. The most important and common division being with respect to the action of the steam and they are as below,

 

C) Combination of Impulse and Reaction Turbine.
 

In an impulse design of steam turbine, there is an attempt to attain no expansion of steam within the moving blades and as such its pressure remains constant while passing over the blades. The expansion of steam, however, takes place in a set of stationary nozzles which lower its pressure but impart a high velocity to it. The velocity attained in a properly designed nozzle depends upon the pressure drop through it.

Impulse turbine design may be classified as single stage, multi pressure stage, multi velocity stage and combination of multi pressure and velocity stage. The term pressure stage refers to unit of nozzles combined with moving blades in which the energy of the steam resulting from each pressure drop is utilized. The velocity stage refers to the number of moving blades in which the energy of the steam in each pressure drop is absorbed.

In case of reaction turbine the steam expands as it flows over the blades which, therefore act as nozzles. In fact it is this drop in pressure that gives a reaction and hence motion to the rotor.

A pure reaction turbine comprises of two or more radial tubes rotating and communicating with another pipe through which steam is supplied to nozzle which are screwed into the ends of the radial pipes and arranged with their axis in the tangential direction.

From the above description you may not know the detail of each type of Impulse Turbine but I think this information will force you to search more on the topic (Impulse Turbine) of turbine engineering. I will also try to share something more on this subject in coming post. What more you want to know about Impulse Turbine?
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Hi,This is Prasanna talking with you.I am mechanical engineer by eduction and profession.Here I shared all my engineering tutorials with you.If you like these tutorials,please spread it with world. Prasanna Sutrave