PROFIL AERODYNAMIQUE REFROIDI PAR FLUIDE

1303034 Turbomachine blades GENERAL ELECTRIC CO 25 June 1970 [1 Oct 1969] 30964/70 Heading FIT A cooled blade, e.g. for the rotor or stator of a turbine or compressor, comprises leading and trailing edge chambers 38, 54 separated by a serpentine path defined by interconnected longitudinal passages 56, 58. Cooling air is supplied through openings 30 in the root of the blade and same flows to chamber 35 and thence into an insert 42 secured in chamber 38, the walls of the latter being impinged upon by air jets issuing through ports 49 in the insert. Some of this air escapes from chamber 38 through holes 74 while some issues through holes 76 in a tip cap 34. The remainder of the air entering the blade through openings 30 flows to a chamber 36 and thence into longitudinal passage 56 from which some flows to inter-connected passages 58 before exhausting through holes 76 in tip cap 34, while some flows through holes 66 into trailing edge chamber 54. Air escapes from the latter through the holes 76 and through inclined holes 70. Heat transfer is improved by pins 68 extending across chamber 54 and by ribs 72 within passages 56, 58. The ratio of the projecting height of each rib 72 to the distance between the blade walls 24, 26 lies between 0À02 and 0À07, whilst the distance between adjacent ribs 72 is approximately ten times the projecting height.