Derive an expression for the blade efficiency of a single row impulse steam turbines assuming equiangular blades in terms of nozzle angle a1 = 200 and K = 0.9, what is the maximum blade efficiency and corresponding blade angles?
If the blade efficiency is 85% of the maximum value, what are the possible blade sped ratios for the same nozzle angle a1, blade velocity coefficient, K and equiangular blades? Also, find the corresponding blade angles.