Sea-level standard air is sucked into a vacuum tank through a nozzle, as in Fig. P9.63. A normal shock stands where the nozzle area is 2 cm2, as shown. Estimate
(a) The pressure in the tank; and
(b) The mass flow. Solution: The flow at the exit section (€œ3€) is subsonic (after a shock) therefore must equal the tank pressure. Work our way to 1 and 2 at the shock and thence to 3 in the exit:

Transcribed Image Text:

2 cm2 cm2 Vacuum tank /13cm2 Sea-level air