solution

Air enters a 3600-kW turbine operating at steady state with a mass flow rate of 18 kg/s at 800 C, 3 bar and a velocity of 100 m/s. The air expands adiabatically through the turbine and exits at a velocity of 150 m/s. The air then enters a diffuser where it is decelerated isentropically to a velocity of 10 m/s and a pressure of 1 bar. Employing the ideal gas model, determine

(a) the pressure and temperature of the air at the turbine exit, in bar and C, respectively.

(b) the rate of entropy production in the turbine, in kW/K.

(c) Show the processes on a T–s diagram.