CENTRIFUGAL FLUID MACHINE

摘要

Provided is a centrifugal fluid machine configured so that the separation of flow due to the difference between the angle of a discharge flow from an impeller and the angle of a vane entrance is prevented to improve the performance of a diffuser provided with vanes. A centrifugal fluid machine is provided with blades, an impeller which has the blades, and a diffuser (21) which is provided downstream of the impeller and which has vanes (24) provided between a shroud-side wall surface (22) and a hub-side wall surface (23), the shroud-side wall surface (22) and the hub-side wall surface (23) facing each other. The centrifugal fluid machine is configured so that fluid, the pressure of which has been increased by rotating the impeller, passes through and flows out of the diffuser (21). The centrifugal fluid machine is provided with one or more working fluid ejection openings (25) which are open at the hub-side wall surface (23) and which eject a working fluid in the flow direction of the fluid along the pressure surfaces (24a) of the vanes (24). The working fluid ejection openings (25) are provided at radial positions closer to the front edges of the vanes (24) than positions located at a throat radius (R2).