Impellers are of two types—single-eye type and double-eyed type as shown in Fig. 14.3 (a) and (b), respectively. In a single-eye type, air enters into the compressor from one side only, whereas in a double-eyed type, air enters from both sides. A double-eyed type impeller sucks in more air and has the advantage of self-balancing over a single-eye impeller.
In multi-stage compressors, the output of the first stage is passed on to the second stage and so on, as shown in Fig. 14.3(c).
Figure 14.3 Types of impellers: (a) Single eye impellers, (b) Double eye impellers, (c) Multi-stage impellers
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