GT Internal Cooling

[MrMyers]

Experts,

Obviously answers to this question will be somewhat turbine specific, but I am after a ball park figure.

What percentage of the total air mass flow rate through the compressor is extracted for use cooling the bucket internal passages?

I have heard reference to 1-2% per stage, which is believable, but also reference to 10%+ per stage.

Thanks

 

[Trublu97]

Per EPRI, a 11 hole stage has 1.4% cooling flow. GE unit.