Originally Posted by
nzhills
Hi, can someone please direct me to a document that gives the temperature of the air taken from the 7th stage compressor on the CF6-80C2 for control of the HP turbine tip clearance? My searching on the web did not reveal much. Regards Mark
7th stage HPC air is used to cool the 1st stage LPT nozzle leading edge and the cavity aft of the 2nd stage HPT rotor. At idle on a standard day, the 7th stage is 49 deg C (I got this figure from some old boroscope training notes - not on the web).
The LPT and HPT cases (Turbine Clearance Control) are cooled by fan discharge air via TCC valves.