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Academics – Applied Heat : 2013/JUL/05
Question

Q3. The specific enthalpy drop in the nozzles of a simple impulse turbine is 495KJ/kg. The moving blades are symmetrical, and the blade velocity coefficient is 0.9. Steam leaves the blades in an axial direction. The diagram efficiency is 0.82.

(a) Sketch the combined velocity diagram, clearly labelling velocities and angles.

(b) Determine EACH of the following:

(i) The blade velocity

(ii) The change in whirl velocity

(iii) The nozzle angle

(iv) The blade angle.

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