| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of a revolving component in a radially spreading air flow passage air duct, to suppress development of a disturbance boundary layer in the vicinity of the wall surface of a guide simultaneously with deviation of it to a radial component, and to suppress the increase of fluid noise in the air flow passage air duct simultaneously with suppression of deterioration of hydrostatic pressure characteristics and hydrostatic pressure efficiency. SOLUTION: An air flow having a strong revolution component (a peripheral direction) from a blade 5 suppresses the revolution component of an air flow in the vicinity of the guide wall surfaces 7a and 8a by forming a plurality of radial ribs 10 and 11 on the guide wall surfaces 7a and 8a of an air flow passage air duct 9 and deviates it to a radial component. An air flow in the air flow passage air duct 9 is also attracted by its viscosity, the revolving component is suppressed and deviated to the radial component. A disturbance boundary layer in the vicinity of the wall surfaces 7a and 8a of first and second guides 7 and 8 suppresses development.
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