Flow coefficient in axial compressor is defined as-______. (Axial velocity of flow = v_f, Blade velocity at periphery = u)

Explanation:

Flow Coefficient (ϕ ) – The flow coefficient of an axial flow compressor is defined as the ratio of mass flow rate and mass flow rate at the tip of the blade.

\(\phi = \frac{{Mass~flow~rate~through~compressor}}{{Mass~flow~rate~at~the~tip~of~blade}} = \frac{m}{{{m_{tip}}}}\)

\(\phi = \frac{{{V_f}}}{{{V_f}\left( {\tan {\alpha _1} + \tan {\beta _1}} \right)}} = \frac{{{V_f}}}{U}\)

α1  = Angle of absolute velocity V1 at the inlet

β1 = Blade inlet angle

U = Blade velocity