Question: A converging-diverging nozzle is supplied with air at a total pressure of 250 psi. The area of the throat is 0.1 in2. The exit area is 1.6 in2. Find the following (use of the nearest values in tables is acceptable):
(a) The greatest back pressure for which the throat is choked.
(b) The one value of the back pressure for perfect supersonic expansion.
(c) The lowest back pressure for which there is a shock in the nozzle.
Use these back pressures to determine:
(a) The range of back pressures for which a shock exists in the nozzle.
(b) The range of back pressures for which the flow is overexpanded.
(c) The range of back pressures for which the flow is underexpanded.