Fluid Mechanics and Thermodynamics of Turbomachinery, 5e

(a) the static pressure at rotor exit is 100kPa, and
(b) the nozzle enthalpy loss coefficient, zN = 0.06,
determine
(i) the diameter of the rotor and its speed of rotation;
(ii) the vane width to diameter ratio, b2/D 2 at rotor inlet.
Solution. (i) The rate of mass flow is given by
From eqn. (8.25), T03 = T01(1 - S) = 1050 ¥ 0.8 = 840K.
Hence, T3 = 832.1 K.
Substituting values into the mass flow equation above,
(ii) The rate of mass flow equation is now written as
Solving for the absolute velocity at rotor inlet and its components,
Radial Flow Gas Turbines 269
To obtain a value for the static density, r2, we need to determine T 2 and p 2: