Centrifugal Compressors

The compression element of a centrifugal compressor is the impeller or wheel. As the impeller rotates, the air caught between the blades is forced to move outward at increasing speed, away from the eye of the impeller. As the air exits the impeller, it enters the diffuser and scroll volute, where the velocity of the air (kinetic energy) is converted to pressure (static energy). Smooth, continuous flow is established as the motion of the air away from the eye causes a low-pressure area that draws more air into the impeller. Figures 30-10a and 30-10b show the impeller,

Discharge Port

Discharge Port

Discharge Port

Secondary ^ iß==SinM/ Rotor Os

Secondary^ 2SiUKf/ Rotor Os

Secondary Rotor

Main ^¡Cg/t^rytf^i Mainj Rotor Rotor

SiSaTf^ Mai^ Rotor

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