(Solved): An axial flow gas turbine with equal stage inlet and outlet velocities has the following design da ...

An axial flow gas turbine with equal stage inlet and outlet velocities has the following design data based on mean diameter. Inlet stagnation temperature is 927 °C, inlet stagnation pressure is 400 kPa, an axial flow velocity, Ca, is constant at 350 m/s, mass flow rate is 20 kg/s, blade speed, U, is 400 m/s, the absolute velocity angle at inlet, a?, is 55° and the absolute velocity angle at outlet, az, is 15?. Calculate; i. ii. iii. iv. V. the rotor blade gas angles (3? and 32) at mean diameter the degree of reaction (R) at mean diameter the blade loading coefficient (y) at mean diameter the runner output power (Euler power) the total nozzle throat area if the throat is situated at the nozzle (stator) outlet. The nozzle loss coefficient, CN, is 0.07. (Note: the nozzle (stator) outlet is point 1 in Mollier chart for an axial flow gas turbine) For gas: Specific heat ratio, y = 1.333, gas constant, R=287 J/kg.K and specific heat at constant pressure, Cp = 1147 J/kg.K (CO1-12 marks, CO2-6 marks)