| 摘要 |
PROBLEM TO BE SOLVED: To facilitate increase in a pressure ratio of a centrifugal compressor 29 while maintaining durability of a compressor impeller 37.SOLUTION: A protrusion part 55 (57) protruding radially outward with respect to a maximum diameter part 39o of a compressor disc 39 is formed at a rear edge 43b (45b) of each compressor blade 43 (45). The protrusion length L1 of the protrusion part 55 (57) of each compressor blade 43 (45) is set to be equal to or less than 10% of the radial length L2 of the maximum diameter part 39o of the compressor disc 39. A span position of an apex 55p (57p) of the protrusion part 55 (57) of each compressor blade 43 (45) is set to be at 10-90% span position with a hub end 43bh (45bh) of the rear edge 43b (45b) being a reference, and preferably, at 30-70% span position. |
