Discussion
Consider the following statements about supersonic wind tunnels:
1. The nozzle area ratio fixes the test-section Mach number.
2. A second throat downstream reduces the drive power needed.
3. The test-section Mach number can be varied by changing the fan speed.
Which of the statements given above is or are correct?
Answer: B
The first two are correct. The third is false: once the nozzle is choked the Mach number depends on the area ratio alone, so it is changed by swapping nozzle blocks or flexing the walls, not by driving the flow harder.
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