Combustion Gas Turbines - The Compressor (HP) Turbine PDF Print E-mail
Written by Norrie   
Wednesday, 13 January 2010 10:12
Article Index
Combustion Gas Turbines
Principles and Operation
The Air Compressor
The Combustion Chamber
The Compressor (HP) Turbine
The Variable-Angle Nozzles Load Turbine
Turbine/Compressor Lube Control Oil System
Turbine Hydraulic Oil Trip System
Turbine Overspeed Trip Mechanisms
Turbine System Details
All Pages

3. THE COMPRESSOR (HP) TURBINE

As the air enters the stator vanes, it is compressed. This is due to the 'Funnelling Effect' which occurs as the molecules crowd together between the vanes. In Figure. 19, it can be seen that the distance between the nozzles at point 'A' is greater than at point 'B'. As the air molecules leave the stator, they are no longer crowded between the vanes and undergo a pressure drop. This decrease in pressure gives increased velocity to the air. The high velocity air is directed at the rotor blades and causes the rotor to rotate. This conversion to mechanical work absorbs some of the energy from the hot air but the gases still contain a lot of energy which can do more work. As mentioned earlier, the axial air compressor needs a driver. The high pressure turbine is connected by shaft to the air compressor. This turbine is referred to as the 'H.P'. or 'Compressor' turbine.

Figure. 19



Last Updated on Wednesday, 24 February 2010 20:06