Momentum Source Value

Siva.K

Hi all, could any body help me defining the momentum source value for my problem. i understand that

Momentum Source X Component = -C*(u-uspec)

how could i come out with the value for "C" my domain is a compressor blade i did a calculation as follows

Momentum source = -c*m(v2-V1) where C - 10e5 m - mass flow rate V2 - exit velocity from the blade V1 - inlet velocity to the blade

will it work if not how should i specify to get the right velocity and pr raise across the blade