Patent ID: 7972106

Claim:
A protection device for a stator of a gas turbine of the type comprising a series of sectors constrained to each other by connection means, each sector has at least one cavity having a bottom, in correspondence with said at least one cavity, a corresponding sheet equipped with a series of pass-through holes and suitable for covering said at least one cavity, being fixed on an outer surface of the relative sector, each sector being cooled by means of a stream of air coming from said pass-through holes of the corresponding sheet which is passed on said bottom and discharged from at least one outlet hole, characterized in that said bottom of each sector comprises a series of protuberances to increase the thermal exchange surface and increase the cooling efficiency of the protection device, each protuberance of said series of protuberances has a crest having a crest radius which, divided by the square root of the surface area of said bottom, has a value ranging from 0.0037 to 0.0050.