Centrifugal compressor having vaneless diffuser and vaneless diffuser thereof

摘要

In a high pressure centrifugal compressor (100), the occurrence of rotating stall noticeable in a comparatively-low specific speed wheel stage is prevented, thereby high efficient fluid performance is obtained and reliability is improved. The centrifugal compressor (100) has a first vaneless diffuser (21) with a constant flow channel height on the downstream side of an impeller (1), and a second vaneless diffuser (22) in which the flow channel height decreases in a flow direction from an inlet to an outlet on the downstream side of the first vaneless diffuser (21). These diffusers (21,22) are combined with an impeller (1) using thick blades.