I modeled a fan and try to use flow simulation so i followed the solidworks 2012 flow simulation tutorials

then i try to calculate the efficiency but the result is more than a 100% i attached the value i obtained and the fan picture.

the efficiency formula that i use is :

Pressure drop = (Av inlet Static Pressure)-(Bulk Av Static Pressure)

Efficiency = (Pressure Drop)*(Inlet Volume Flow)/(Torque on Impeller)

Is my formula is wrong?

Are you sure your formula is correct? Efficiency should be non-dimensional.

(pressure)x(volume flow rate) = (N/m^2)x(m^3/s) = (N-m/s)

(torque) = (N-m)

Your formula is wrong.