Paul Carey Wrote> > Exhaust material comments:

Turbine combustion chambers are different to piston/rotary engine

exhausts,

and often have a layer of air between the flame front and the liner

(some

liners are only .020" thick).

Mark Wrathall wrote:

Turbine CC's are not titanium. They are at least made from the Nimonic series
(older engines), or one of the new proprietary superalloys like RENE N5 or
MAR-M (Cobalt based)
http://www.suppliersonline.com/propertypages/marm918.asp.

The cooling of gas turbine CC's is the crown jewels of the manufacturers
engineering knowledge. The big three manufacturers each have their own base
of  empirical data, and limited modeling techniques to assist in designing
a new liner. The newest liner designs are quite different between the three.

Mark

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