Question $(3)$ Outcome $(2)$

$10$ Marks

Superheated steam enters an impulse moving blade with the mass flow rate of $700k\frac{g}{s}$ and the speed of $600\frac{m}{s}$ at the angle of $17($the angle between the blade velocity and the absolute velocity of the inlet flow$).$ The blade is symmetrical. The shaft diameter is $0\mathrm{.}3$ m $,$ the blade height is $0\mathrm{.}7$ m $.$ To take the friction into account, the velocity coefficient can be taken as $94\%.$

$($a$)$ Draw the velocity vector diagram for the inlet and outlet flows.

$($b$)$ Determine the maximum output power of the blade.

$($c$)$ Determine the blade efficiency.

$($d$)$ Determine the rotational speed of the turbine rotor.

Solution