Using coordinates T/T* and ðs 2 sÞ=cp, where s* is
the entropy at M 5 1, plot the Fanno line for air flow for
0:1 , M , 3:0.
Air flows through a 40 ft length of insulated constantarea duct with D 5 2.12 ft. The relative roughness is
e=D 5 0:002. At the duct inlet, T1 5 100F and p1 5
17:0 psia. At a location downstream, p2 5 14.7 psia, and the
flow is subsonic. Is sufficient information given to solve for
M1 and M2? Prove your answer graphically. Find the mass
flow rate in the duct and T2.
