Where necessary, assume air as an ideal gas and consider R = 287 J/(kg.K), Cp = 1005 J/(kg.K), Cv = 718 J/(kg.K). A nozzle is a device that is used to increase the velocity of a fluid by varying the...

Where necessary, assume air as an ideal gas and consider R = 287
J/(kg.K), Cp = 1005 J/(kg.K), Cv = 718 J/(kg.K).

A nozzle is a device that is used to increase the velocity of a fluid
by varying the cross-sectional area. At the last section of a jet
engine (Fig Q1.a, section 5), air with a mass flow rate of 50 kg/s at
a pressure of 500 kPa and a temperature of 600 K enters a nozzle
with an inlet cross-sectional area of 5 m2
. The exit area of the
nozzle is 20% of its inlet area. The air leaves the nozzle at a
velocity of 300 m/s. The nozzle is not well-insulated and during
this process, 5 kJ/kg heat is lost.

(iv) Determine the temperature of the air as it leaves the nozzle.


(v) Calculate the pressure of the air as it leaves the nozzle.