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Q5. The steam condition at a stage in a 50% reaction turbine is 0.18 bar and 0.94 dry.

The stage develops a power of 1800 kW at a speed of 400 rev/min.

The mass flow of steam is 54 tonnes/hour.

The fixed blades have an exit angle of 21.5° and the axial velocity is 79% of the blade speed at the mean blade radius.

(a) Sketch the stage velocity vector diagram indicating the velocities. (3)

(b) Calculate EACH of the following:

(i) The mean diameter of the blade ring; (4)

(ii) The blade height; (4)

(iii) The diagram efficiency.(5)