# Ratio of isentropic work to Euler work in centrifugal compressor

Q.  What is the ratio of isentropic work to Euler work in an centrifugal compressor called?
- Published on 16 Sep 15

a. Work coefficient
b. Velocity coefficient
c. Pressure coefficient
d. Flow coefficient

#### Discussion

• Pankaj   -Posted on 15 Oct 15
The actual work required by the compressor is always more than the theoretical work, because of the friction losses as well as turbulence losses.

An empirically determined factor Ψw which is called as work factor is used to determine actual work. The actual work is obtained by multiplying the work factor by theoretical work. The value of work factor Ψw varies between 1.03 to 1.06

Therefore,
Actual work done, W = Ψs x Ψw x (Cbo)2

And the ratio of isentropic work to Euler work of compression is defined as pressure coefficient

Therefore,

Ψp = (Isentropic work) / (Euler work)

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