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Q5. The steam condition at a stage in a 50 % reaction turbine is 0.16 bar and 0.95 dry. The speed of rotation is 3600 rev/min with a mass flow rate of 36 tonne/hour. At These conditions the stage develops a power of 1000 kW. The moving blade exit angle is 18° and the axial velocity of the steam is 80 % of the blade velocity at the mean radius.

(a) Sketch The velocity vector diagram for the stage and identify the whirl velocities at inlet and exit. (3)

(b) Calculate EACH of the following:

(i) The mean diameter of the blade ring; (6)

(ii) The blade height; (3)

(ii) The diagram efficiency. (4)