Exam 17: Compressible Flow

Air is approaching a converging-diverging nozzle with a low velocity at 20°C and 85 kPa, and it leaves the nozzle at a supersonic velocity. The velocity of air at the throat of the nozzle is

Consider gas flow through a converging-diverging nozzle. Of the five statements below, select the one that is incorrect:

Consider a converging nozzle with a low velocity at the inlet and sonic velocity at the exit plane. Now the nozzle exit diameter is reduced by half while the nozzle inlet temperature and pressure are maintained the same. The pressure at nozzle exit will

Air is flowing in a wind tunnel at 8°C and 86 kPa at a velocity of 235 m/s. The Mach number of the flow is

A bullet is moving in still air at 15°C at a velocity of 1200 m/s. The air temperature at the nose of the bullet where stagnation occurs is

Combustion gases with k = 1.34 enter a converging nozzle at stagnation temperature and pressure of 460°C and 780 kPa, and are discharged into the atmospheric air at 20°C and 100 kPa. The lowest pressure that will occur within the nozzle is

Air is flowing in a wind tunnel at 25°C, 80 kPa, and 180 m/s. The stagnation pressure at a probe inserted into the flow stream is

Carbon dioxide enters a converging-diverging nozzle at 50 m/s, 600°C, and 450 kPa, and it leaves the nozzle at a supersonic velocity. The velocity of carbon dioxide at the throat of the nozzle is

An aircraft is reported to be cruising in still air at 5°C and 68 kPa at a Mach number of 0.82. The velocity of the aircraft is

Argon gas is approaching a converging-diverging nozzle with a low velocity at 20°C and 120 kPa, and it leaves the nozzle at a supersonic velocity. If the cross-sectional area of the throat is 0.225 m², the mass flow rate of argon through the nozzle is