I would like to know about the difference between the stalling and surging of the axial flow compressor in turbines.
1)The IGV s serve to protect from surging.
2) the Ilnet bleed heating and the compressor bleed valves are used for preventing from stalling.
I would like to have my doubt clarified.
Thanks in advance
There is an excellent resource on the World Wide Web known as Wikipedia. If one Googles "compressor+stall", the very first listing is the Wikipedia definition of combustion turbine compressor stall, and it mentions compressor surge in the first sentence or two.
http://www.wikipedia.org--one of the only things it lacks is a decent, understandable definition of Droop Speed Control/Governor Mode....
When a "generic" GE-design heavy-duty gas turbine is at rated speed, the IGVs (Inlet Guide Vanes, or Modulated Inlet Guide Vanes) are used to control the air flow through the unit ("generic" as in a unit without DLN (Dry Low NOx) combustors). This is usually done to limit combustor pulsations and/or to maximize exhaust temperature (for Combined Cycle operation).
The compressor bleed valves are used to protect the compressor during start-up and shutdown--below rated speed.
Inlet Bleed Heat is used to protect the compressor during operation with the IGVs less than approximately 57-62 DGA (DeGrees Angle)--which is usually only done on DLN combustor-equipped units. Some--NOT all--units with Inlet Bleed Heat also have Anti-Icing Control which is used to protect the inlet against iding through the use of the Inlet Bleed Heat system.