Patent ID: 7770375

Claim:
A gas turbine engine comprising: a combustion section; a turbine section downstream of said combustion section, said turbine section including at least one stationary vane, at least one rotating turbine blade, and at least one blade outer air seal, at least one of said at least one stationary vane, said at least one turbine blade and said at least one blade outer air seal to be provided with a cooling air stream; and a collection material to be placed in the cooling air stream for collecting impurities, said collection material having an outer face including a plurality of impurity collection spaces, said collection material being placed downstream of said combustion section, and upstream of at least a portion of said turbine section, and said collection material being placed such that dirt-laden portions of the cooling air stream will pass along the collection material, while cleaner air will pass radially inwardly of the collection material.