Discussion
A supersonic nozzle has an area ratio of \( 1.69 \). Its test-section Mach number is
Answer: A
An isentropic area ratio of 1.687 corresponds to Mach 2 on the supersonic branch for air. The area ratio alone fixes the test-section Mach number, which is why a supersonic tunnel changes Mach number by changing nozzle blocks or by using flexible walls.
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