question_answer

             Given: \[{{v}_{w\,2}}=\] velocity of whirl at outlet         

\[{{u}_{2}}=\]Peripheral velocity of the blade tips

The degree of reaction in a centrifugal compressor equal to:

A) \[1-\frac{{{v}_{w\,2}}}{2{{u}_{2}}}\]              

B) \[1-\frac{{{u}_{2}}}{2{{v}_{w\,2}}}\]

C) \[1-\frac{2{{v}_{w\,2}}}{{{u}_{2}}}\]              

D) \[1-\frac{{{v}_{w\,2}}}{{{u}_{2}}}\]