Provided here is an actual schlieren experimental picture (left) of air flow in an overexpanded C-D nozzle (area ratio=2.9) that exits into ambient where the pressure, Pb =18.05 kPa. The nozzle flow originated from a reservoir with a pressure of 199.6 kPa. To analyze this symmetric problem, you can look at the three regions a, b, and c as shown in the schematic (right). Calculate Mach numbers in regions a, b, and c. Oblique Shocks Jet boundary
