Turbine engine assembly and method of assembling the same

A combined-cycle power generation system comprising:

• a gas turbine engine comprising a rich burn combustor configured to corn bust an air-fuel mixture having excess fuel such that a flow of corn busted gas having a depleted oxygen content is discharged therefrom and a lean burn combustor positioned downstream from said rich burn combustor, said lean burn combustor configured to corn bust the excess fuel in the flow of corn busted gas such that the flow of exhaust gas discharged from said gas turbine engine has a depleted oxygen content, wherein at least one hot gas path component of each of the rich burn combustor and the lean burn combustor is formed at least partially from a ceramic matrix composite material;
• and
• a heat recovery steam generator positioned to receive the flow of exhaust gas discharged from said gas turbine engine, said heat recovery steam generator configured to:
• cool the flow of exhaust gas such that a flow of water condensed from the flow of exhaust gas and a flow of cooled exhaust gas is discharged from said heat recovery steam generator;
• and
• channel the flow of cooled exhaust gas directly into each of the rich burn combustor and the lean burn combustor towards said at least one hot gas path component of each of the rich burn combustor and the lean burn combustor,
• wherein said at least one hot gas path component comprises a plurality of cooling holes for channeling the flow of cooled exhaust gas therethrough, such that a protective film is formed over said at least one hot gas path component.