| 摘要 |
In the present invention a diffuser (43) has an annular parallel section (49), and an annular constricted section (51) formed so as to be continuous with the inside of the parallel section (49) in the radial direction. A wall surface (51s) of the constricted section (51) includes a minimal flow passage surface area part (51e), which minimizes the surface area of a flow passage in the diffuser (43), and an annular protruding part (53), which is located closer to the outlet side of a compressor impeller (35) than the minimal flow passage surface area part (51e), and protrudes toward the flow passage of the diffuser (43). |
