Find the range of exit pressures for which the duct exit flow is choked.

Room air is drawn into an insulated duct of constant

area through a smoothly contoured converging nozzle.

Room conditions are T 5 80

F and p 5 14:7 psia. The duct

diameter is D 5 1 in. The pressure at the duct inlet (nozzle

outlet) is p1 5 13 psia. Find (a) the mass flow rate in the duct

and (b) the range of exit pressures for which the duct exit

flow is choked.

*These problems require material from sections that may be omitted without loss of continuity in the text material.

778 Chapter 13 Compressible Flow

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