Discussion
Ratio of isentropic work to Euler's work in centrifugal air compressor is known as :
Answer: D
The ratio is the pressure coefficient.
In a centrifugal compressor, Euler's work is the work actually done on the air by the impeller, while the isentropic work is the minimum work needed for the same pressure rise. Their ratio, the pressure coefficient, shows how much of the impeller's work goes into raising the pressure.
The slip factor is the ratio of the actual whirl velocity to the ideal whirl velocity at the impeller tip. The work factor (power input factor) allows for losses such as friction and windage, and the degree of reaction is the share of the pressure rise that takes place in the impeller.
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