| 摘要 |
An annular diffuser (27) is formed on an outlet side of a wheel (13) in a housing (5). A shroud-side wall surface (27s) and a hub-side wall surface (27h) of the diffuser (27) are parallel to a radial direction, respectively. A plurality of annular steps (35) is formed on the shroud-side wall surface (27s) of the diffuser (27). Each step (35) is formed so as to expand a flow passage width of the diffuser (27) along a flow direction of a main flow. |
