Essentially, a centrifugal compressor consists of four elements namely, inlet buckets, impeller, diffuser, and casing as shown in Fig. 14.1. The inlet buckets are attached to the shaft and rotate with it, which guide air on the impeller. The impeller consists of a disc on which radial blades are attached. The diffuser surrounds the impeller and provides diverging passages for air flow, thus increasing the air pressure. The air coming out from the diffuser is collected in the casing and taken out from the outlet of the compressor.
Figure 14.1 Centrifugal compressor
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