PROBLEM ON IMPULSE STEAM TURBINE 02 GRAPHICAL METHOD

In a De Laval turbine, steam issues from the nozzle with a velocity of 1200 m/s. The nozzle angle is 20°, the mean blade velocity is 400 m/s. The inlet and outlet angles of blades are equal. The mass of steam flowing through the turbine per hour is 1200 kg. Calculate, 1. Blade angles, 2. Relative velocity of steam entering blades, 3.Tangential force on the blades, 4. Power developed, 5. Blade efficiency. Take blade velocity coefficient as 0.8.