Discuss the relative merits and demerits of axial flow compressor over centrifugal compressor. Air at a temperature of 300 K enters a ten stage axial flow compressor at the rate of 3.5 kg/sec. The pressure ratio is 6.0 and the isentropic efficiency is 90%. The process is adiabatic and the compressor has symmetrical stages. The axial velocity of 120 m/sec is uniform across the stage and the mean blade speed of each stage is 200 m/sec. Assume that the temperature change is same in each stage. Determine the direction of the air at entry to and exit from the rotor and the stator blades. Also find the power given to the air. Take Cp = 1.005 kJ/kg and K = 1.4