| 摘要 |
PROBLEM TO BE SOLVED: To suppress the lowering of the mechanical strength of an overall low-pressure turbine case 3 by minimizing the number of positions on a low-pressure turbine case where stress concentration occurs. SOLUTION: An arc-shaped bump 51 having a bump plane 51fa and a bump arc face 51fb is formed on the surface of a back plate 37 at the rear end side, and a honeycomb cell 59 allowing the contact of the tip part of a turbine blade 19 therewith is integrally formed with the rear surface of the back plate 37. The bump plane 51fa is surface-finished by machining so that a distance between the bump plane 51fa and a case hook plane 49fa when the thermal displacement of the back plate 37 in the shroud axial direction in operating an engine is estimated becomes a specified distance m setting the flow of cooling air CA flowing rearwards between the turbine case 3 and the back plate 37. COPYRIGHT: (C)2005,JPO&NCIPI |
