In: Mechanical Engineering
Air at 5 bar and 560K is expanded in steady flow in a horizontal
convergent–divergent duct to an exit velocity
of 640 ms−1. The walls of the duct are heated so as to keep the
temperature drop to one-half the value of an
isentropic expansion to the same velocity and pressure from the
same initial conditions. Calculate, assuming
negligible initial velocity:
a. the heat supplied;
b. the final temperature;
c. the mass flow rate per square metre of exit area.