The rotor blades of an axial-flow turbine stage are 100 mm long and are designed to receive gas…

 The rotor blades of an axial-flow turbine stage are 100 mm long and are designed to receive gas at an incidence of 3 from a nozzle row. A free-vortex whirl distribution is to be maintained between nozzle exit and rotor entry. At rotor exit, the absolute velocity is 150 m/s in the axial direction at all radii. The deviation is 5 for the rotor blades and 0 for the nozzle blades at all radii. At the hub, radius 200 mm, the conditions are as follows: Nozzle outlet angle 70 Rotor blade speed 180 m/s Gas speed at nozzle exit 450 m/s Assuming that the axial velocity of the gas is constant across the stage, determine a. the nozzle outlet angle at the tip; b. the rotor blade inlet angles at hub and tip; c. the rotor blade outlet angles at hub and tip; d. the degree of reaction at root and tip. Why is it essential to have a positive reaction in a turbine stage?

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