| 摘要 |
751,011. Turbine blade cooling. NAPIER & SON. Ltd., D. June 23, 1954 [July 6, 1953], No. 18736/53. Class 110(3) The upstream face of a root portion of a turbine rotor blade is provided with two or more parallel axially-projecting ribs which are inclined when viewed from upstream, the ribs being so dimensioned that when a ring of blades is mounted in position in a turbine rotor disc, the adjacent ends of the ribs abut to form a plurality of spiral vanes with spiral passages therebetween for flow of cooling air. The blade shown comprises a vane portion 11, a platform 12, a fir tree root portion 13 and a stem portion 14 between the platform and the fir tree root portion. Inclined ribs 20 are formed on the upstream face of the stem portion 14 and passages 21 are disposed therebetween. The plurality of spiral passages 21 for flow of cooling air formed by the assembly of blades is shown in Fig. 1. Each stem portion 14 is formed with two recesses 22 on either side of a web, the recesses 22 of each pair of adjacent blades forming cavities to which cooling air is supplied and discharged therefrom as described and claimed in Specification 751,010. |
