Losses in a centrifugal compressor are due to

Explanation:

Compressor:

• The air compressor used in gas turbines is of rotary type mainly axial flow turbines. 
• It draws air from the atmosphere and compressed to the required pressure.

Compressors can be of two types:

1. Positive displacement type Compressor:
   • Positive displacement type like reciprocating compressors, Root's blower, and vane - sealed machines.
2. Rotary type Compressor:
   • Rotary type like centrifugal and axial flow compressor.

Losses in centrifugal compressor:

• Intel losses : 
  • At the inlet of the compressor, major losses occur due to the formation of eddy's, turbulence, and friction.
  • Since the entry of fluid in a centrifugal compressor is axially then suddenly fluid is being directed to radially towards blades and due to this off-design condition incidence losses occur.
• Impeller losses:
  • Recirculating losses: these losses occur due to flow reversal of fluid at the impeller exit, this backflow of fluid is a function of the vane exit angle.
  • Wake-mixing losses: this loss occurs when fluid flow through the passage of blades, and it causes awake in the vanless space of the rotor.
  • Slip losses: these losses occur due to the inertia effect of fluid between blade passage, and a component of velocity lost which is called slip in whirl component.
• Diffusor losses :
  • When fluid flows through diffusor frictional losses occur in the diffused area due to skin friction coefficient and since the area is decreasing in the direction of flow hence positive pressure gradient is created so back flow losses can also occur in diffusor.